رمزنگاری تصویر مبتنی بر آشوب با عملیات جایگشت-جانشینی همزمان در سامانه‌ها با منابع محاسباتی محدود
ابراهیم زارعی زفره
1
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گروه علوم کامپیوتر، دانشکده ریاضی و کامپیوتر خوانسار،دانشگاه اصفهان، اصفهان، ایران
)
محسن کیانی
2
(
گروه علوم کامپیوتر، دانشکده ریاضی و کامپیوتر خوانسار،دانشگاه اصفهان، اصفهان، ایران
)
کلید واژه: رمزنگاری تصویر, توابع آشوب, جایگشت, جانشینی, IoT.,
چکیده مقاله :
داده‌های چندرسانه‌ای همانند تصویر، کالاهای ارزشمندی هستند که انتقال امن آنها در شبکه‌ای متصل از دستگاه‌های اینترنت اشیاء بسیار حیاتی است. تکنیک‌های رمزنگاری تصویر نقش اساسی در محافظت از داده‌های بصری از دسترسی غیرمجاز و تضمین حریم خصوصی دارند. با توجه به محدودیت‌های محاسباتی، ذخیره‌سازی و انرژی در دستگاه‌های اینترنت اشیاء، توسعه راه‌حل‌های رمزنگاری سبک و از نظر محاسباتی کارآمد بسیار حائز اهمیت می‌باشد. در این مقاله یک طرح رمزنگاری تصویر مبتنی بر آشوب با استفاده از عملیات جایگشت-جانشینی همزمان در سامانه‌ها با منابع محاسباتی محدود ارائه می‌شود. در طرح پیشنهادی از عملیات همزمان جابه‌جایی چرخشی برای بازآرایی پیکسل‌ها و همچنین از عملیات جانشینی چهارطرفه برای تغییر مقادیر پیکسل‌های تصویر استفاده شده است. طرح فوق با پیادهسازی برداری عملیات جابه‌جایی چرخشی و جانشینی چهارطرفه همزمان در سطرها و ستون‌های ماتریس تصویر، از نظر محاسباتی بسیار سبک و دارای سطح امنیتی بالا است. طرح پیشنهادی عملکرد آماری چشمگیری را با معیارهای کلیدی مانند فضای کلید 2256، آنتروپی بزرگ‌تر از 99/7، همبستگی نزدیک به صفر برای تصویر رمز، 60/99< NPCR و 46/33< UACI نشان می‌دهد. علاوهبراین، طرح رمزنگاری پیشنهادی یک تصویر با اندازه 1024×1024 را در مدت زمان 036234/0 ثانیه در برد رزبریپای 5 رمزگذاری می‌کند.
چکیده انگلیسی :
Multimedia data such as images are considered a valuable and sensitive resource. Therefore, their safe transmission over public networks formed, such as those composed of internet of things (IoT) devices, is vital. Image encryption techniques play a crucial role in protecting image data from unauthorized access and ensuring privacy. Given the limited computing power, storage capacity, and scarce energy resources of IoT devices, it is vital to develop image encryption algorithms that are computationally affordable for such devices. This paper proposes a chaos-based image encryption scheme that enforces simultaneous permutation-substitution and is designed for resource-constrained IoT devices. In the proposed method, circular shift operation for pixel reorganization and a substitution operation for modifying pixel values in four directions are applied simultaneously. The operations are accelerated through vectorization, achieving both low execution time and a high security level. The algorithm demonstrates significant robustness against various security analyses, achieving a key space of 2256, an entropy greater than 7.99, UACI greater than 33.46, NPCR greater than 99.60, and correlation values close to zero. Furthermore, the proposed algorithm encrypts a 1024×1024 image in 0.0362345 seconds on a Raspberry Pi 5 board.
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