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<p>For a long time, information security has been provided through symmetric-key block ciphers. as a fundamental cryptological component. One of the most important methods for privately and securely ensuring the security of media transmission is the development of multimedia encryption. In our modernized scheme, we amended the CAST 128 scheme by utilizing a new mixed table for data and the chaotic function “Zaslavsky map,” in the encryption process. We furthermore enhanced the S-box process by employing the chaotic function and the secret key, and the subkey technique by using the Toeplitz MDS matrix. Our suggested CAST consists of a round Feistel block with block size of 256-bit, key size of 256 bit, four S-boxes, and 72 subkeys. The Proposed CAST uses the operations XOR, Additions, Subtractions, and Shifts. Our improvement aims to achieve a higher diffusion level. Red, Green, and Blue are the three simple image channels to which the suggested cryptosystem is applied. The suggested technique is hence extremely secure against a wide range of cryptographic threats.</p>

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An enhanced CAST 128 algorithm using toeplitz MDS matrix and zaslavsky chaotic mapping function

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Fatma Ahmed,
  • Yasser H. Elkamshoushy,
  • Dalia H. Elkamchouchi

摘要

For a long time, information security has been provided through symmetric-key block ciphers. as a fundamental cryptological component. One of the most important methods for privately and securely ensuring the security of media transmission is the development of multimedia encryption. In our modernized scheme, we amended the CAST 128 scheme by utilizing a new mixed table for data and the chaotic function “Zaslavsky map,” in the encryption process. We furthermore enhanced the S-box process by employing the chaotic function and the secret key, and the subkey technique by using the Toeplitz MDS matrix. Our suggested CAST consists of a round Feistel block with block size of 256-bit, key size of 256 bit, four S-boxes, and 72 subkeys. The Proposed CAST uses the operations XOR, Additions, Subtractions, and Shifts. Our improvement aims to achieve a higher diffusion level. Red, Green, and Blue are the three simple image channels to which the suggested cryptosystem is applied. The suggested technique is hence extremely secure against a wide range of cryptographic threats.