π€ AI Summary
This work proposes a unified block cipher framework based on Sudoku puzzles to address the vulnerability of multimedia data during transmission and the limitations of conventional encryption methods in achieving both robust security and multimodal compatibility. For the first time, a timestamp-driven dynamic key mechanism is integrated into the Sudoku-based encryption scheme, enabling efficient and secure encryption of images, audio, and video within a single architecture. The approach combines Sudoku permutation with XOR substitution to form a lightweight block cipher. Experimental results demonstrate that the proposed method achieves near-perfect NPCR (close to 100%) for image encryption and an SNR exceeding 60 dB for audio encryption, significantly enhancing resistance against brute-force and differential attacks.
π Abstract
Encryption and Decryption is the process of sending a message in a ciphered way that appears meaningless and could be deciphered using a key for security purposes to avoid data breaches. This paper expands on the previous work on Sudoku-based encryption methods, applying it to other forms of media including images, audio and video. It also enhances the security of key generation and usage by making it dependent on the timestamp of when the message was transmitted. It is a versatile system that works on multimodal data and functions as a block-based transposition cipher. Instead of shuffling, it can also employ substitution methods like XOR, making it a substitution cipher. The resulting media are highly encrypted and resilient to brute-force and differential attacks. For images, NPCR values approach 100% and for audio, SNR values exceed 60dB. This makes the encrypted audio significantly different from the source, making decryption more difficult.