Introduction Of A Multikey Multiround Chaining Scheme For The Vigenère cipher

This paper introduces the JAM Stream cipher, an improved version of the classical Vigenère cipher, designed to address its known vulnerabilities. The proposed cipher technique incorporates a multi-key, multi-round, and chaining scheme to significantly enhance security. By leveraging these techniques, the JAM Stream cipher creates a strong Avalanche effect, ensuring substantial changes in ciphertext for minimal alterations in plaintext or keys. Experimental results confirm the cipher's resilience against differential attacks and brute-force methods, demonstrating a marked improvement over traditional algorithms, namely the Vigenère cipher and DES. However, the JAM Stream cipher faces computational complexity challenges for real-time and high-performance applications. To facilitate further research and practical implementation, the source code is available at https://github.com/alberttuwan1/JAM_Stream_Cipher. Future research will explore optimization strategies to balance security and efficiency, paving the way for broader adoption in secure communication systems.