FLHB-AC: Federated Learning History-Based Access Control Using Deep Neural Networks in Healthcare System
الموضوعات :
Nasibeh Mohammadi
1
,
Afshin Rezakhani
2
,
Hamid Haj Seyyed Javadi
3
,
Parvaneh asghari
4
1 - Department of Computer Engineering, Islamic Azad University, Boroujerd Branch, Borujerd, Iran
2 - Department of Computer Engineering, Faculty of Engineering, Ayatollah Boroujerdi University, Boroujerd, Iran
3 - Department of Computer engineering, Shahed University, Tehran, Iran
4 - Department of Computer Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
الکلمات المفتاحية: Healthcare System, History-based Access control, Intelligent Module, Deep Recurrent Networks, Federated Learning ,
ملخص المقالة :
Giving access permission based on histories of access is now one of the security needs in healthcare systems. However, current access control systems are unable to review all access histories online to provide access permission. As a result, this study first proposes a method to perform access control in healthcare systems in real time based on access histories and the decision of the suggested intelligent module. The data is used to train the intelligent module using the LSTM time series machine learning model. Medical data, on the other hand, cannot be obtained from separate systems and trained using different machine-learning models due to the sensitivity and privacy of medical records. As a result, the suggested solution employs the federated learning architecture, which remotely performs machine learning algorithms on healthcare systems and aggregates the knowledge gathered in the servers in the second phase. Based on the experiences of all healthcare systems, the servers communicate the learning aggregation back to the systems to control access to resources. The experimental results reveal that the accuracy of history-based access control in local healthcare systems before the application of the suggested method is lower than the accuracy of the access control in these systems after aggregating training with federated learning architecture.
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http://jist.acecr.org ISSN 2322-1437 / EISSN:2345-2773 |
Journal of Information Systems and Telecommunication Vol.12, No.2, April-June 2024, 90-104
|
Abstract
Giving access permission based on histories of access is now one of the security needs in healthcare systems. However, current access control systems are unable to review all access histories online to provide access permission. As a result, this study first proposes a method to perform access control in healthcare systems in real time based on access histories and the decision of the suggested intelligent module. The data is used to train the intelligent module using the LSTM time series machine learning model. Medical data, on the other hand, cannot be obtained from separate systems and trained using different machine-learning models due to the sensitivity and privacy of medical records. As a result, the suggested solution employs the federated learning architecture, which remotely performs machine learning algorithms on healthcare systems and aggregates the knowledge gathered in the servers in the second phase. Based on the experiences of all healthcare systems, the servers communicate the learning aggregation back to the systems to control access to resources. The experimental results reveal that the accuracy of history-based access control in local healthcare systems before the application of the suggested method is lower than the accuracy of the access control in these systems after aggregating training with federated learning architecture.
Keywords: Healthcare System; History-Based Access Control; Intelligent Module; Deep Recurrent Networks; Federated Learning.
1- Introduction
A health information system (HIS) is a data management system for healthcare. This comprises systems for collecting, storing, managing, and transmitting a patient's electronic medical record (EMR); hospital operational management systems; and systems that support healthcare policy choices. Health information systems also include data management systems for healthcare practitioners and organizations. These technologies, for example, might be used to enhance patient outcomes, inform research, and impact policy and decision-making. Security is a critical concern in health information systems because they typically access, analyze, or store a substantial amount of sensitive data [1]. Access control refers to a set of procedures used to determine who or what has access to, uses, or changes what resources [2]. Access control is a critical topic in the design debates of physical security, information security, and network security to limit risks and threats. With the rapid advancement of computing and information technologies, classic access control models have become insufficient in terms of severe security needs, and new applications. ABAC models provide a more flexible way to deal with the authorization requirements of complex and dynamic systems. Modern access control systems and feature-based systems are becoming more popular [3,4]. Organizations are interested in adopting systems to regulate access to their resources that can best meet these demands as the use of access control systems expands in many industries such as IoT, cloud computing, and health care systems. During the COVID-19 time, for example, many businesses need a flexible approach to accessing software resources, allowing the user access to be adjusted based on the circumstances [5]. One of the existing challenges in access control systems is to use the previous accesses to grant the access permission at the next stage online and without interruption. Also, protecting patients' privacy while checking previous accesses is another challenge facing this article, which we try to solve it. The contributions of this paper are as follows:
ü Using access histories in granting access permission to healthcare information systems.
ü Using the deep recurrent network and intelligent module to provide online/real-time access requests.
ü Maintaining the privacy of patient data in the HIS system and using local patient data to train the learning model
ü Using federated learning to consolidate the training of local healthcare systems and improve the accuracy of the access control
The rest of this paper is as follows: Section 2 presents the background and fundamental concepts used in the paper background. In section 3, the surveys of related works are considered. The suggested approach and its components are explained in section 4. In section 5, the performance results and comparison with previous works are described. A discussion of our work is presented in section 6 and finally, section 7 concludes the paper.
2- Background
The basic ideas utilized in the article are defined in this section. The definitions of ABAC access control systems are explored first, followed by deep recurrent neural networks and federated learning model.
2-1- Attribute-based Access Control
The attribute-based access control (ABAC) is a type of access management model in which permission to perform a set of operations is determined by analyzing the attributes assigned to requesters, resources, and requested activities, as well as environmental conditions in some cases. Attributes are qualities that indicate a specific aspect of the requester and objects, environmental circumstances, or requested actions that the administrator has already established and assigned [4][6].
· Definition 1. Entities and Attributes: U, O, C, and OP are the system users (requesters), requested resources, defined particular conditions, and requested operations in the ABAC access control paradigm. Also, Au, Ao, Ac, and Aop are the attributes of the requester, source, condition, and requested operation, respectively. Also, E = U 
O, is the set of all entities, and A = Au Ao 
Ac Aop is the set of all attributes of the entities mentioned above.
· Definition 2. Mapping Function: If a∈A and e∈E, Fe,a is the mapping function of the entity e on the attribute a. More precisely, the function Fe,a(e,a) returns all the items that are related to the existence of e on attribute a. For example, Fa,e(Ali, location) = Tehran means that the location related to Ali is Tehran.
· Definition 3. Access request(req): An access request is a <u, o, c, op> where a requester u has requested operation op to access resource o in condition c. For example, <Ali, db1, Tehran, read> is an access request by Ali, who wants to read access to the source db1 from Tehran.
· Definition 4. Conventional access policy: Access permission is a sample(sample) sample=<req, g> decision g on request reqi in the access control system. sample can also be considered as access history and shows the access details.
· Definition 5. History-based access policy: If the access request is based on the records of sample <u, o, c, op>, the user u has requested the operation op to access the source o in the condition c where there is a cj in c and it is essential to check the histories or check the prior accesses. For instance, <db1, location.NewYork, count100(access(db1, location(Tehran))<2), read, permit> is an access policy of this type. If two conditions are met, the requester is granted access to db1. First, the requester's location must be in New York, and the number of accesses on db1 from the Tehran location should be no more than twice in the preceding 100 accesses. As a result, the access policy is established as <u, o, c, op, g> granting the requester g access in exchange for op access on o.
· Definition 6. Policy Repository(pr): A database containing all of the policies described in definitions 5 and 6. This repository's policies are organized into two broad groups. The first category includes only attributes related to the requester, resource, condition, and the requested operation (as seen in definition 1, we have designated the set of all these attributes with A), and the second category includes attributes that require checking access histories, which we denote by LA.
· Definition 7. History Access: If the current access request was made at time t, the access history provides a list of all accesses made from time t-k to time t-1. For example, if Rt-k access is provided at time t-k and Rt-1 access is granted at time t-1, the following access histories are defined at time t: Hi(t)={Rt-k, Rt-k+1, …, Rt-1}
2-2- Recurrent Neural Networks
Recurrent neural networks (RNNs) are artificial networks that are utilized in speech recognition, natural language processing, and sequential processing [7]. However, RNN features a feedback layer that feeds back the network's output as well as the next input. RNN can recall its previous input and use this information to process a sequence of inputs because of its internal memory. Simply said, RNNs incorporate a feedback loop that ensures that past knowledge is not lost and remains in the network. The following are the architecture types of RNNs.
2-2-1-Simple Recurrent Neural Network (RNN)
This is the most basic sort of recurrent network, yet it is still a viable alternative due to its modest number of parameters (when compared to GRU and LSTM networks) and reasonable accuracy in simple situations and short time series. The fundamental issue with simple RNNs is their limited memory, which results in vanishing and exploding gradients [7].
2-2-2-Long Short-Term Memory (LSTM)
LSTM networks are an upgraded version of RNNs that improves memory recall. In this sort of network, the problem of progressive fading of RNNs has been solved. LSTM is appropriate for time series categorization, processing, and prediction in the presence of time delays of unknown duration [8]. In addition, the LSTM network cell's inputs and outputs are as follows.
2-2-3-Gated Recurrent Units (GRUs)
The GRU recurrent neural network, like the LSTM, is intended to alleviate the RNN's short memory problem. Hidden layers are employed to handle and categorize input in the gated recurrent network rather than the state cell [9][10].
2-3- Federated Learning
The purpose of federated learning is to train a machine learning algorithm, i.e. deep neural networks, on multiple local datasets that exist at local nodes without explicitly exchanging data. The general principle consists of training local models on local data samples and exchanging parameters (e.g. weights and biases of the deep neural network) between these local nodes at some frequency to produce a global model shared between all nodes. The main difference between federated learning and distributed learning is in the assumptions made about the properties of the local datasets because the main goal of distributed learning is to parallelize the computing power whereas federated learning initiative aims to train heterogeneous datasets. While the goal of distributed learning is to train a single model on multiple servers, a common underlying assumption is that the local datasets are identically distributed and have approximately the same size. None of these hypotheses were made for federated learning. Instead, data sets are typically heterogeneous and their size may span several orders of magnitude. In addition, clients involved in federated training may be unreliable as they are subject to more failures or dropouts compared to distributed learning where nodes are typically data centers with powerful computing capabilities and are connected to fast networks [11] [12].
2-4- Healthcare System
A Healthcare platform enables doctors and their assistants to analyze data. Such an infrastructure should have things like simple equipment management, simple connections, data analysis, and intelligent data transformation [13]. Due to the vast amount of information, healthcare platforms must have the ability to accurately and timely analysis to provide the best analysis of various conditions. An overview of IoT-based healthcare is shown in Figure 1. The following components are essential in healthcare systems:
ü Data collection using existing sensors
ü Supporting a simple user interface for use by all patients and medical centers
ü Access to infrastructure services and network services for all nodes in the network
ü Increasing reliability, accuracy, durability, and strength in data storage and transmission.
Figure 1. An overview of a typical IoT-based healthcare system [14]
2-5- Related Works
This section will look at some recent studies in the field of the present subject. The authors of [15] presented a blockchain-based access control system for GWAS with BFGF federated learning in their paper. Before training the local models, the framework uses automatic quality control (AQC) to assure the quality of the training data in this technique. It creates a blockchain authentication system to filter people. The authors of [16] focused on data security and privacy in industrial IoT systems utilizing machine learning models and federated learning models. They also investigated and contrasted other ways. A novel middleware for risk-based authorization and federated learning for health care (FRAMH) has been presented in [17], which provides risk-based access control for medical records. The authors employed a federated learning approach to assess health status risk and integrated it with blockchain to prevent unwanted access. Another study [18] offered "Hash and Signature-Based Policy-Based Encryption (hCP-ABES)," a cloud-based healthcare system for secure data storage and access control. The authors' proposed access control provides users with security, authentication, and secrecy when using medical data. Encryption and auditing procedures are employed to maintain the confidentiality and integrity of stored information. Access control mechanisms are usually used to govern data access during the data-sharing phase. In the data analysis process, machine learning algorithms are used to secure the privacy of massive medical data [19]. The authors of [20] suggested a framework to address issues such as information leaking in access granting. The authors suggested a federated learning framework for access control policies as well as a formal explanation of the policy transfer problem in attribute-based access control. Recent breakthroughs in the field of federated learning for cyber security and IoT security have been thoroughly addressed in [21]. This study's primary focus is on security, but it also explores different techniques for addressing FL-related performance difficulties that may compromise IoT security and performance. Another area of study is federated learning use in industrial systems [22]. This research looks into the FL prospects for next-generation networked industrial systems, as well as the problems of collaborative driving in connected and robotic autonomous vehicles. An approach for leveraging federated learning as a service with Decentralized Identities is proposed in [23]. The authors presented a DID-eFed system in which decentralized identities (DID) and a smart contract facilitate FL. DID offers flexible decentralized access management in the proposed system, and the smart contract provides a process with a few errors. [24] investigates FL in-depth, focusing on applications and operating systems, methods, and real-world applications. FL generates robust classifiers without requiring information disclosure, resulting in extremely secure privacy policies and access control rights. The authors in [25] propose a novel approach of combining CNN-LSTM with particle swarm optimization in the RBAC system. The convolutional neural network has extracted parsed SQL queries and long short-term memory was also suitable for modeling the temporal information of SQL queries. The paper [26] has considered an access control model for multi-channel heterogeneous networks based on deep reinforcement learning, referred to as multi-channel deep-reinforcement learning. To overcome the challenges of securing IoT devices, the authors in [27] have suggested a deep learning–based intrusion detection system to detect security vulnerabilities in IoT. The research [28] has protected the agreements dependent on ERC20 of controlled Ethereum-based Distributed Ledger Technology with cycles and capacities to get an all-surrounding framework for creating sure Cloud-Based Manufacturing jobs. effective attribute-based encryption is suggested in [29] which places part of the cryptography in the edge nodes as well as supports attribute updates and flexible control. To address the problem of scalability in access control, the authors in [30] have proposed an enhanced Bell–LaPadula model and categorized the peers and transactions in different clearance and security levels. In the article [31], the authors have proposed a blockchain-based approach that provides a decentralized EHR and smart-contract-based service automation without compromising the system's security and privacy. The paper [32] discussed some gaps within the existing access control strategies for health care. To fill this gap, the authors have proposed a secure access control model to control access in the healthcare system. Their solution has used the location of the user for providing secure access control views in the healthcare system. The article [33] has planned to create a novel solution based on blockchain technology that locates the patient in charge of granting and revoking access permissions for healthcare enterprises and providers to meet privacy regulations. Motivated by the research gaps, the paper [34] proposed a scheme, that integrates a blockchain (BC)-based confidentiality-privacy (CP) preserving scheme. In the paper [35], the authors have discussed how leveraging blockchain for healthcare data control can lead to better improvements. they presented the key blockchain features and characteristics. The paper [36] has focused on privacy issues in smart context-aware healthcare within the Electronic Transfer of Prescriptions. The access control models may expose user privacy to an attacker. To tackle this problem, the authors [37] have used the cuckoo filter to disguise the right of entry policy to safeguard the private information of the owner. The inference assault has affected medical records. The paper [38] has proposed a new blockchain-based lightweight access control model. The scheme has used blockchain to create a trusted network by a special mechanism. The paper [39] reviewed the recent trends and critical requirements for blockchain-based and IoT access management. The authors showed several important views of blockchain, including decentralized control, secure storage, and sharing information for IoT access control. Deep learning and artificial intelligence frameworks are introduced in the paper [40] to improve cyber security such as access control. The authors in [41] have proposed a novel model by implementing a specific cryptography algorithm in which they used the Key generation scheme of RSA to encrypt health data. The paper [42] has proposed a deep learning-based anomaly detection method composed of estimation and classification models applied to a subdomain in healthcare systems. the authors [43] have conducted a universal review of federated learning systems. To get a clear flow and guide future probes, they introduced the definition of federated learning systems and analyzed the system sections. The authors of [44] presented a method for automatically learning ABAC policy rules from the access logs of a system. In the proposed approach, an unsupervised learning-based algorithm is used to recognize patterns in extracting ABAC authorization rules. In [45], an efficient and simple method has been proposed to verify the access control policy using a machine learning classification algorithm. Cotrini et al. [46] suggested an approach for deriving some rules from randomly distributed histories. In [49], a novel method was suggested for secured and integrated access control in the SIEM. The key points where the SIEM accesses the information within the software were specified and policies for access control were developed. To achieve energy efficiency in the network some simplification strategies have to be carried out not only in the Medium Access Control (MAC) layer but also in the network and transport layers [50].
3- Problem Definition
Although giving access authorization in HIS systems necessitates the use of feature-based access control, only limited features such as the requester's location and time have been used to validate access permission thus far. In the first step of this research, "access history" is proposed as an essential component in HIS system access control. A pulse based on a log, for example, is described as "a certain drug is administered to a patient if it is prescribed by at least two doctors." For such a pulse, the prior logs must be examined. To study access control policies based on log conditions, LSTM and GRU deep learning models are utilized, which must be triggered live during access requests. Deep learning is employed since you cannot spend a lot of time verifying access histories while seeking access. As a result, memory neural networks such as LSTM and GRU will be useful.
The limited number of samples available to train the learning model in local HIS systems presented a challenge during the initial step. Furthermore, because of privacy concerns, it is not viable to gather all medical data in HIS systems and train the intelligent learning model (previous step). As a result, the federated learning architecture is used in the second stage of the proposed approach, and instead of transferring data to the server, the suggested model is produced in the server and delivered to the HIS systems. After training the model in HIS systems, the model's output is forwarded to the server, which aggregates the results.
3-1- Challenges and Requirements
To develop log-based access control that can be applied to a wide range of real-world scenarios, we identify the following challenges and requirements:
· Online access request: Log-based resource access requests are submitted online and require a prompt, no-delay response with a short time order. However, the problem of the access control system based on access histories necessitates a review of past logs as well as the processing and time loads. As a result, the proposed model should be able to handle a huge number of online queries.
· Correctness in log-based access control: Because the extracted access decision must result in the same access decision as the policy repository, the suggested log-based access control system's prediction (response) must be compatible with the result of the original permission in the policies. An inconsistent answer may arise in instances where previously approved access is refused (more restrictive) or the system allows unlawful access (less restrictive).
· The complexity of log-based policies: The complexity of log-based policies is one of the most important challenges in access control systems. In many policies, it is not required to check logs, but in some policies, logs should be checked. Such conditions will cause complexity in meeting all the conditions with a reciprocal effect on each other.
· Privacy Violation: Considering that medical records in HIS systems contain private information of patients, it is important to protect privacy during research and data review.
3-2- Evaluation Metrics
How well these accesses match the original accesses is one of the metrics for evaluating the quality of the accesses provided in the proposed approach (given by the original pulses). In other words, the proposed method's access result is compared to the original pulses' access result, and the quality of the suggested access control system is evaluated. For example, if the suggested method's prediction for an access request is to grant permission and access permission is granted in the main policy, the quality of the proposed approach will improve. The following definitions are taken into account for a more complete study of the proposed approach's evaluation metrics.
· Definition 8 (TP definition): If an access request is reqi=< attrs, attro, opr, act > and the proposed approach prediction for reqi is equal to predi, and also if the original access policy is rulj=< attrs, attro, opr, act> and the label (access) of the original policy equivalent to the request is equal to labj, then TP is defined as follows.
TP<req,pred> = | <r> ϵ DS | (lab(rul(r)) == permit) && (pred(req(r)) == permit) |
· Definition 9 (Definition of TN): Despite the assumptions of Definition 8, TN is defined as follows. This means that the prediction made by the proposed approach with the original policy label corresponding to that request is equal to denial.
TN<req, pred> = | <r> ϵ DS | (lab(rul(r)) == deny) && (pred(req(r)) == deny) |
· Definition 10 (Definition of FP): Despite the above assumptions, FP is defined as follows. This means that the prediction made by the proposed approach is permitted, but the label of that request in the original policy is equal to deny, and it shows the wrong prediction in the proposed approach.
FP<req, pred> = | <r> ϵ DS | (lab(rul(r)) == deny) && (pred(req(r)) == permit) |
· Definition 11 (Definition of FN): If the prediction made by the proposed approach is denied and the label of that request in the original policy is equal to permit, it means a wrong prediction in the proposed approach, which is defined as follows.
FN<req, pred> = | <r> ϵ DS | (lab(rul(r)) == permit) && (pred(req(r)) == deny) |
· Definition 12: by calculating the above metrics, Accuracy = 
can be defined to determine the accuracy of the proposed approach.
Table 1 presents the symbols used in this article.
Table 1. Notations
Notation | Definition |
U, O, C, OP | Users(requesters), resources, conditions, and operations |
Au, Ao, Ac, Aop | attributes of the requester, source, condition, operation |
E, A | U |
a, e, cj | a∈A, e∈E, cj∈c |
G | Access permission |
Fe,a | Mapping function of the entity e on the attribute a |
C | Conditions in access histories |
t, k | Time |
Ri | Access in time i |
Hi | access histories in time t |
mi | Equivalent method with any condition C |
M | set of methods {m1, m2, ...} |
F#, S# | The number of data features, The number of data samples |
reqi | Access request i |
Qi | Set of features reqi |
Train_Set | Training dataset in conditional dataset |
NLA | Set {nla1, nla2, …} |
LA | Set {la1, la2, …} |
| Policy Repository |
PAP | Policy administration point |
PEP | Policy enforcement point |
PDP | Policy decision point |
PIP | Policy information point |
DT, KNN, NN, SVM | decision tree, k-nearest neighbor, neural network, Support vector machine |
a<t>, c<t> | Current stage status |
a<t-1>, c<t-1> | The status of the previous stage |
x<t>,ŷ<t> | Input, output (prediction) of the recurrent network |
wa, Wo, Wf, Wu و Wy و wc | Weight vectors |
tĈ | status of the new stage |
σ | sigmoeid activity function |
uҐ, fҐ | Update gate, Forget Gate |
by, buوbcو ba | Bias |
g1,g2 | tanh activity functions |
Figure2. Proposed multi-layer architecture
Before delving into the FL architecture, some key assumptions must be addressed. 1) Using access histories to authorize access is one of the requirements of healthcare systems. A nurse, for example, can inject a specific drug into a patient if it has been ordered by two general practitioners or a specialist. 2) Deep learning models based on time series, such as Simple RNN, LSTM, and GRU, are appropriate for granting access based on previous access histories. 3) Learning models like LSTM and GRU employ the order of subsequent accesses to grant access authorization. 4) The privacy of medical data is a distinguishing aspect of healthcare systems. As a result, patient information cannot be withdrawn from the local healthcare system.
The following sections describe the various components of the suggested method (which are explained in depth in the next section)
1. Federated learning architecture for LHS knowledge aggregation: The data is trained locally in each LHS's access control system before being utilized to give access. However, the difficulty with this proposal is the lack of limited and sensitive data, resulting in inadequate training for the proposed intelligent module. As a result, the technique of federated learning architecture is presented to aggregate the knowledge of intelligent access control systems (which exist in local healthcare systems).
2. An intelligent module within the access control system: to train the access control system, deep learning methods based on time series, such as LSTM or GRU, are used. When the policy repository incorporates access control rules based on checking access histories, the intelligent module in the access control system is required and unavoidable. As a result, an intelligent module for each local healthcare system is installed alongside the access control system.
3. Customized access control: When intelligent modules are installed in local access control systems and the knowledge of various modules is combined, the intelligent access control system is customized.
4-1- Design of Federated Learning Layers
First, servers are created in the cloud layer to aggregate training in local healthcare systems. These servers are cloud-based and have no access to medical records (data) in healthcare systems. These servers' primary function is to build a machine learning model based on time series and then distribute it to all local systems.
First, using Algorithm 1, a machine learning model based on time series is generated in the cloud layer servers. This article focuses on the use of LSTM and GRU models. In this algorithm, the learning model is defined first, followed by the necessary pre-processing. The necessary layers are then inserted, and the model compiles and begins training.
Algoithm1. Machine learning model created in server in the smart machine |
Procedure Create-Model () Input: Conditions, dataset Output: Forever () { model ß Sequential () dataset ß Preprocessing(dataset) model ß CreateModel () model. Add (layers, optimizers, activations, …) ... model.add (Dense, Dropout, …) model. Compile (Train_Set) model. Fit (Train_Set) } |
The model developed on the server is transferred via fog layer nodes to the intelligent module of local healthcare systems. There is no data transfer in this transfer; just the learning model is sent to the fog nodes to be sent to the local LHS systems.
After training the models in the intelligent module of the local systems, the results are transmitted back to the servers to be aggregated and re-distributed to the local systems via the fog layer nodes. Figure 3 depicts the sequence of generating the model on the server, delivering it to the LHSs, and resending the trained weights from the LHSs to the servers via the fog layer nodes.
Figure 3. The sequence number of training models transfers from the server to the local healthcare systems
4-2- Intelligent Module Design
As previously stated, client layer design is a component of federated learning architecture. The proposed intelligent module is the federated architecture's client component. As a result, at this stage, the intelligent module is generated locally within the healthcare system's access control system. The learning engine, reaction engine, and access logs are all part of the local smart module. Machine learning models based on time series are assembled and run in the learning engine. It trains the learning model in the engine using local access records. In addition, the response engine will be employed in the access control system to answer access requests. When the policy repository contains policies that need access histories to be reviewed, the response engine is used (rather than checking all previous accesses). Figure 4 depicts the proposed module's components and their connections.
Figure 4. Components and connections of the intelligent module within the access control system
4-3- History-based Access Control Design
The proposed access control system uses an attribute-based model (access history). According to this model, the requestor sends the request to the policy enforcement point or PEP. This component sends the request to the PDP. PDP makes decisions through two main units policy repository and PIP. The PIP informs the current status of the requester and the resource. Also, all policies are in the policy repository.
So initially, the PIP delivers all the requester and resource attributes to the PDP. The PDP then retrieves access control policies associated with the requester from the policy repository. If the history corresponding to the requester in the policy repository does not contain log-based properties, the access permission is granted directly from the repository and there is no need to call the intelligent module's response engine. However, if the requester's history in the repository contains log-based properties, the PDP refers to the response engine, and the response of this engine is issued as a result of the access permission. Algorithm 2 shows the implementation of the access control system, which can implement both the current ABAC systems and the systems based on access histories.
Algoithm2. Access control algorithm | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Procedure AccessControl() Input: requesti Output: grant reqi ß requesti PEP sends reqi to PDP PDP asks information of reqi from PIP Qi ß PIP (reqi) For all If If Return Else if prk [LA] != Return ( SmartMachine. Result [reqi] ) } 5- Experimental Results Based on access histories, a prototype of an access control system is created. The evaluation conditions and datasets utilized are explained first in this section. The evaluation parameters are then set, and the performance of the proposed access control system in the federated learning framework is carefully examined. Finally, the proposed method's performance is compared with previous studies. 5-1- Evaluation Conditions A system with an Intel Core i7 processor and 16 GB RAM is utilized to analyze the suggested model. Anaconda and Python are used to transfer time series-based learning models from servers to clients and vice versa. We conducted our studies on six datasets and twelve situations. How well the accesses match the original access is one of the major metrics for evaluating access accuracy. In other words, the proposed system's access results are compared to the key policies' access results, and the suggested access control system's quality is evaluated. For example, if the proposed system predicts that an access request will be granted and access authorization is granted in the primary policy, the quality of the suggested system would improve. 5-2- Datasets We employ six datasets, including real and conditional datasets, to evaluate the performance of the proposed approach. Real datasets such as Kaggle and Amazon UCI datasets [47][48] are employed, as well as conditional datasets. The RESOURCE, MGR ID, ROLE ROLLUP1, ROLE ROLLUP2, ROLE DEPTNAME, ROLE TITLE, ROLE FAMILY DESC, ROLE FAMILY, ROLE CODE, and a label field are among the ten features in the Kaggle dataset. In addition, the UCI dataset has five features and approximately 716K samples, including ACTION, TARGET NAME, LOGIN, REQUEST DATE, AUTHORIZATION DATE, and labels. Four conditional datasets are also employed, where each one is generated based on the criteria and sequence of accesses. These four datasets are created using Python and based on the description of numerous requirements. They comprise features such as Name, Role, Time, Location, Sensitivity, and labels. Table 2 shows the general characteristics of the datasets used. D is the name of the dataset used in this table, S# is the number of dataset samples, F# is the number of dataset features, P+ is the number of samples labeled 1 and P- is the number of samples labeled zero.
Table 2. Characteristics of the employed datasets
5-3- Results In the first stage, the performance of the proposed method is investigated; conventional classification models such as KNN, SVM, DT, and NN, as well as time series classification models such as Simple RNN, LSTM, and GRU, have been implemented on datasets dK, dU, dC1, dC2, dC3, and dC4, and the results are shown in figures 5 and 6. As can be observed, models based on time series, such as LSTM, outperform conventional classification methods in terms of correct identification of the access control system.
The performance depicted in the figures above is estimated assuming that all data is accessible. However, the suggested method places the data in local healthcare systems and prevents it from being forwarded to servers. As a result, the dataset dK is partitioned into ten smaller datasets numbered dK1 through dK10. Similarly, dU,1 to dU,10, dC1,1 to dC1,10, dC2,1 to dC2,10, dC3,1 to dC3,10, and dC4,1 to dC4,10 are formed from dU datasets, as are dC1, dC2, dC3, and dC4. The separated datasets are located in local healthcare systems (Client), and none of these data are stored on the server owing to privacy concerns. On the server, a time series-based learning model is defined. This model is then given to ten clients depending on the written codes. The received model is applied to the data in clients, and the model is trained. The models' output (weight matrix) is then provided to the servers. The results are aggregated on the servers and resent to the clients. Table 3 displays the acquired results.
Table 3. Comparing the accuracy of the trained model in Local HIS systems and aggregated via federated learning architecture
5-4- Comparison with Recent Studies To demonstrate the outperformance of the proposed approach, its performance is compared with that of Karimi [44] and Cotrini [46]. These methods have calculated the accuracy of their methods using machine learning algorithms. The results show the higher performance of the proposed method compared with others in problems that include time series conditions. Employing the machine learning models based on time series in dK, dU, dC1, dC2, dC3, and dC4 using federated learning has a higher accuracy compared to the method presented by Karimi and Cotrini, as shown in Figure 7. The accuracy of the suggested model, which is based on time series, is compared with the research of Karimi and Cotrini in each local data corresponding to dK1 to dK10, as well as dU1 to dU10, dC1,1 to dC1,10, dC2,1 to dC2,10, and dC3,1 to dC3,10, dC4,1 to dC4,10 and shown in Table 4.
Figure 7. The accuracy comparison of the proposed method with other methods
Table 4. Comparing the accuracy of the trained model in Local HIS systems in each local data
6- Discussion The proposed approach's performance has been carefully investigated in six datasets, and it can be observed that the accuracy of the proposed access control works well in dK and dU datasets using traditional machine learning methods such as SVM, but in conditional datasets, regardless of the circumstances, because access is complicated depending on logs, the techniques outlined above have poorer accuracy in granting right permission. Meanwhile, with more complex conditions in dC1 to dC4 datasets, the suggested method employing deep recurrent networks, particularly the LSTM network, outperforms other algorithms. Another advantage of the proposed method is that it provides internet access in a short time, which is due to the use of hidden memory in the recurrent neural network, as well as the training of this network during each access and testing the network at the time of access request so that no additional burden is imposed on the access control system when a new request is received. Furthermore, using federated learning architecture protects user privacy in HIS systems and integrates knowledge from other systems to allow access to users. 7- Conclusion In this paper, a new approach for granting access authorization in healthcare systems online based on intelligent module decisions was provided. The utilized module responds to access requests using time series learning models such as LSTM and GRU. Local data from healthcare systems cannot also be aggregated in a single dataset. As a result, federated learning architecture and machine learning algorithms were remotely applied to various healthcare systems. The servers were in charge of gathering various learnings and relaying them to the local systems to regulate access based on the experiences of all systems. The experimental results reveal that the performance of the access control system in local systems after implementing the federated learning architecture and aggregating the knowledge of local systems is lower than the performance of this system before implementing the proposed approach.
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Journal of Information Systems and Telecommunication (JIST), 3(35), 207, 2021. * Afshin Rezakhani rezakhani@abru.ac.ir رایمگ
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