طراحی یک الگوریتم اجماع امن برای به‌کارگیری در بلاک‌چین
الموضوعات :
1 - دانشكده مهندسي کامپیوتر، دانشگاه تربیت دبیر شهید رجایی
2 - دانشکده مهندسی کامپیوتر، دانشگاه تربیت دبیر شهید رجایی
الکلمات المفتاحية: بلاک‌چین, الگوریتم اجماع, امنیت بلاک‌چین, الگوریتم اثبات کار, الگوریتم اثبات سهام, الگوریتم تحمل خطای بیزانس,
ملخص المقالة :
فناوری بلاک‌چین، شبکه را از لزوم وجود کارساز مرکزی بی‌نیاز می‌نماید. این فناوری از یک دفتر کل توزیع‌شده تشکیل گردیده که تمامی تراکنش‌های شبکه در آن ثبت می‌شود و شامل زنجیره‌ای از بلاک‌هاست. همه گره‌های شبکه، یک رونوشت از این دفتر کل را دارند. برای آنکه وضعیت این دفتر کل در هر لحظه از زمان برای تمام گره‌های شبکه یکسان باشد، به سازوکاری نیاز داریم که حصول توافق را برای کل شبکه فراهم کند که به آن «الگوریتم اجماع» می‌گویند. ما در این مقاله، یک الگوریتم اجماع جدید ارائه خواهیم نمود که در مقابل چهار حمله رایج بر بستر بلاک‌چین ایمن است. این حملات عبارت هستند از حمله سیبل، حمله منع خدمت، حمله 51 درصد و حمله کسوف. با توجه به آنکه الگوریتم پیشنهادی ما دارای ویژگی‌هایی نظیر وجود پارامترهای کنترلی مختلف، ماهیت عمومی و همه‌منظوره، مقاوم‌بودن در برابر حملات مختلف و سرعت اجرای مناسب است، می‌توان از آن در پیاده‌سازی سامانه‌های امن مبتنی بر بلاک‌چین در حوزه‌های مختلف مانند اینترنت اشیا و سلامت الکترونیک استفاده نمود.
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