Browsing by Author "SYEDA UM-E-RUBAB TIRMAZI"

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    A new cipher design based on trigonometric dynamic S-Box
    (UMT, Lahore, 2022) SYEDA UM-E-RUBAB TIRMAZI
    An information security system is a vital need for the security of data. Strong cryptographic ciphers are required to ensure the comprehensive performance of information security systems. Ciphers are mathematical algorithms that convert plaintext into ciphertext and provide security to the data. Cipher uses different operations like XOR, shift, permutation operation, substitution operation, and many more. For any cipher, the substitution box plays a key role in strong security performance parameters. An S-Box is utilized in a security system that is based on the block ciphering technique, as it is the core element for providing non-linearity in a cryptosystem. In our study, we proposed an S-Box construction method for generating dynamic S-Box with cryptographically strong properties. The idea proposed in this study is inspired by chaotic maps. The proposed dynamic 8*8 S-Box is analyzed using the strict avalanche criterion (SAC), bit independence criterion (BIC), non-linearity, and differential uniformity. The proposed method for the construction of S-Box was proved to produce S-Boxes with high non-linearity and randomness characteristics and the proposed cipher is secure. The proposed cipher consists of ten rounds for encryption, decryption, and key generation. The master key used is 128 bits. The operations used in the proposed cipher are XOR operation, substitution operation, complement, row transformation, etc.