Cryptanalysis of Bitwise Hill Cryptosystem–A Chosen Plaintext Attack

DOI

10.2991/978-94-6239-821-4_6How to use a DOI?

Keywords

Encryption; Decryption; Modular Arithmetic Inverse; Plaintext; Ciphertext

Abstract

This paper cryptanalyzes a block cipher proposed by Ahmed Desoky et al., which essentially is a variant of the classical Hill Cipher. The researchers have modified the cipher wherein, plaintext is taken in the form of rectangular matrices of size 3X8 in the illustration of the cipher. The claim of the authors is that, since the plaintext is in the form of rectangular matrix, there can be no modular arithmetic inverse for the plaintext. Thus, the cipher overcomes the weakness of the classical Hill Cipher, the known plaintext attack vulnerability. The cipher does show resistance against the known plaintext vulnerability exhibited by the classical Hill Cipher. However, the cryptosystem proposed by the researchers’ exhibits weaknesses in the face of the chosen plaintext attack, which is employed in this paper. The cipher is broken with the help of 8 chosen plaintexts.

Copyright

© 2026 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Rampaka Manojkumar
AU  - M. Satish Kumar
AU  - Prudhvi Raju Ganasala
AU  - Sandi Sridhar Reddy
AU  - Macha Pooja
AU  - Ravi Shankar Nanduri
PY  - 2026
DA  - 2026/10/31
TI  - Cryptanalysis of Bitwise Hill Cryptosystem–A Chosen Plaintext Attack
BT  - Proceedings of the International Conference on Information Systems Design And Intelligent Applications (ICISDA 2026)
PB  - Atlantis Press
SP  - 56
EP  - 65
SN  - 1951-6851
UR  - https://doi.org/10.2991/978-94-6239-821-4_6
DO  - 10.2991/978-94-6239-821-4_6
ID  - Manojkumar2026
ER  -