Citation :

Priyamathi Dhanasekaran, Selvakumar Jayakumar, "HRAS-Crypt: A Triple-Layer Hyperchaotic Rössler-AES Cryptographic Framework for FPGA-Based Secure Image Encryption," International Journal of Electronics and Communication Engineering, vol. 13, no. 6, pp. 170-186, 2026. Crossref, https://doi.org/10.14445/23488549/IJECE-V13I6P114

Abstract

Th is study presents the Hyperchaotic Rossler Advanced Encryption Standard Secure Cryptographic Framework (HRAS Crypt), an innovative approach. Triple layer cryptographic design for hardware based image encryption utilizing four keys i mprovements . An Adaptive Hyperc haotic Parameter Optimization (AHPO) algorithm is a dynamically tuned version of an altered algorithm optimal hyperchaotic Rössler system (a=0.15, b=0.2, c=14.0, d=0.02, e=0.10). This system shows two positive Lyapunov exponents (l1=0.347, l2=0.125) with a Kaplan Yorke Dimension (KYD) determined as 3.37, resulting in chaotic sequences th at are exceptionally robust. Secondly, a novel protocol, the Triple Layer Key Derivation Mechanism (TLKDM), produces a new key. Generation of hyperchaotic sequences via Sec ure Hash Algorithm 512 (SHA 512) cryptographic hashing. It operates utilizing a single chaotic sequence. Generate three different cryptographic keys (K AES, K IV, and K perm) with a unique key space of 1.2 x 10108. Third, combining the chaos based spatial permutation with the Chaotic Cryptographic Bridge (CCB) architecture provides a n efficient architectural implementation. Utilized Advanced Encryption Standard Cipher Block Chaining (AES CBC)CBC), which established a dual layered security architecture leveragin g the predictability of hyperchaotic systems. Moreover, the recognized authority of AES encryption. The Heterogeneous Field Programmable Gate Array Architecture (HFA) is based on an efficient framework for p rocessing of the Processing System Programmable L ogic (PS PL) partitioning algorithm on the PYNQ Z2 platform. This generates a resource utilization of 79.20% and an optimal power efficiency of 45.7 MB/s/W. The thorough validation demonstrates that resource utilization achieves optimal power efficiency a t 45.7 MB/s/W. The cryptographic capability is enhanced, with information entropy at 7.9999 bits/pixel (99.99% of the maximum), and correlation coefficients nearing zero ( 0.0015 to 0.0033). The resistance to differential attacks reaches peak levels Number of Pixels Change Rate (NPCR). Cryptographic grade security is confirmed at 99.74 percent, with Unified Average Changing Intensity (UACI) at 33.58 %%, and validated by the National Institute of Standards and Technology (NIST) SP 800 22 randomness assessment. A comparative examination shows that the new system has many advantages: it is 6.9 to 19.6 times faster than software implementations, has the lowest correlation coefficient (0.0018 vs. 0.0036 0.0067), and its key space is 48 orders of magnitude larger th an the best available (10 ¹⁰⁸ vs. 10 ⁴⁰ 10 ⁶⁰). The HRAS Crypt framework sets a new standard for real time encryption in limited resource constraint environments

Keywords

AES CBC, FPGA Architectures, Hyperchao tic Systems, Image Encryptions, SHA 512.

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