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.

翻译：加密与解密是一种以密文形式发送消息的过程，该过程使消息呈现为无意义形式，并可通过密钥进行解密以实现安全目的，从而避免数据泄露。本文在先前数独基加密方法研究的基础上进行扩展，将其应用于包括图像、音频和视频在内的其他媒体形式。该系统通过使密钥生成与使用依赖于消息发送的时间戳，从而增强了密钥的安全性。这是一个适用于多模态数据的通用系统，其功能基于分组置换密码。除乱序操作外，该系统还可采用如XOR之类的替代方法，从而构成替代密码。经处理的媒体数据加密程度高，能够有效抵抗暴力破解和差分攻击。对于图像，NPCR值接近100%；对于音频，SNR值超过60dB。这使得加密后的音频与源音频差异显著，从而增加了破解难度。