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Erschienen in:
2021 | OriginalPaper | Buchkapitel
Cryptanalysis of Modification in Hill Cipher for Cryptographic Application
verfasst von : K. Vishwa Nageshwar, N. Ravi Shankar
Erschienen in: Advances in Machine Learning and Computational Intelligence
Verlag: Springer Singapore
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Abstract
This paper focuses on the strengths and weaknesses of the algorithm proposed by Qazi et al. [1]. The cipher proposed by the authors is highly predictable and suffers from lack of sufficiently strong and complex intermediate operations along with Hill cipher. The Hill cipher, on its own, cannot offer foolproof security. It should be strengthened with sufficiently complex and nonlinear operations which offsets the known plaintext vulnerability which the Hill cipher exhibits. All intermediate operations introduced in the scheme proposed by Qazi et al. are very simple, linear and predictable. Such operations do not strengthen an existing cipher which is proven to be vulnerable to the known plaintext attack. The algorithm cannot stand even moderate cryptanalysis and can be very easily broken. To be more precise, the algorithm can be broken with the help of one chosen ciphertext and four chosen plaintexts. This paper also proposes suitable modifications to offset the vulnerabilities exhibited by the original cipher.