The growing data exchange among consumer-electronic (CE) devices demands encryption methods that balance security, efficiency, and real-time performance. Thus, we introduce a four-dimensional Dynamic Feedback Memristive Chaotic System (4D-DFMCS) and then propose a chaotic encryption method based on block-wise diffusion. Specifically, a 4D-DFMCS with enhanced chaotic properties is constructed by introducing the nonlinear properties of the memristor. It has a larger chaotic range and can improve chaotic dynamic degradation compared with traditional systems, thereby enhancing the security and stability of the encryption algorithm. Using this system for block data diffusion, a novel block-wise random diffusion mechanism is designed. By introducing global dependencies, this method significantly reduces the risk of system deciphering due to eavesdropping attacks. This further enhances the protection of sensitive visual data on CE devices against diverse attacks. In addition, the pre-sharing defects of initial value are prevalent in existing chaotic cryptographic systems, so a novel initial key generation and dynamic update mechanism based on Elliptic Curve Diffie-Hellman Ephemeral (ECDHE) protocol is developed. Finally, the result shows that the key space reaches 4.26 & times;10(178) . The Number of Pixels Change Rate (NPCR) and Unified Average Changing Intensity (UACI) values are obtained as 99.6056% and 33.4333%. It further demonstrates the scheme's robustness against eavesdropping under SNR constraints, with decrypted outputs appearing noise-like below 15 dB. These results demonstrate the strong security performance of the proposed scheme in CE applications requiring both high confidentiality and real-time processing.
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