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A New Variant Of Hill Cipher Algorithm Using Modified S-Box
[Full Text]
AUTHOR(S)
Jessie R. Paragas, Ariel M. Sison, Ruji P. Medina
KEYWORDS
base 64 conversion, cipher block chaining, hill cipher, substitution box
ABSTRACT
Cryptography is used during the exchange of information to guarantee the confidentiality and integrity of data. The hill cipher is a polygraph cipher with a fundamental structure and quick calculations. However, it could be weak with a known-plaintext attack. Another downside is the uncertainty of an invertible key matrix for decryption. In this paper, the process of encryption of plaintext in 128-bit blocks using base 64 conversion, cipher block chaining, and modified substitution box was applied to overcome these weaknesses of the Hill cipher. The proposed method provides improved data security and overcomes the drawbacks of the original hill cipher algorithm. The tests result validates that based on the actual experiment, the security of the ciphertext increases to 64.27% of the avalanche effect score and passes through the randomness test method.
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