Performance Enhancement of CAST-128 Algorithm by modifying its function

G.N, Krishnamurthy; Ramaswamy,; G.H, Leela; M.E, Ashalatha

doi:10.1007/978-1-4020-8741-7_46

Cited by 1 publication

(1 citation statement)

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“…While the inverse matrix is used inside the decryption, a modified AES is used for encrypting audio wave files. The applicability of evaluating a magic square matrix of any order for encryption and decryption is considered [13], [14]. However, the inclusion of 2.13 (factors of 26) has been the most significant limitation for the implementation of hill and magic square ciphers in cryptographically investigations, especially in the decryption process.…”

Section: Related Workmentioning

confidence: 99%

An improvement for CAST-128 encryption based on magic square and matrix inversion

Kareem,

Al-Adhami,

S. Rahma

2024

Bulletin EEI

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This paper presents two image encryption methods which aim to improve the CAST 128-bit algorithm by increasing the security level of encrypted images. The first improvement uses a magic square of order three, while the second improvement uses a 2×2 matrix over GF(P). Both modifications are used in each round of the CAST algorithm, in place of a standard algorithm which uses XOR to increase the correlation between the plaintext and ciphertext. Simulations are carried out in order to evaluate the image encryption system with regard to complexity, time consumption, histogram, information entropy, differential attacks, noise evaluation, adjacent pixels’ correlation index, National Institute of Standards and Technology (NIST) analyses, mean absolute error, and average difference. The experimental results demonstrate that the encryption and decryption time when using the proposed CAST 128-bit algorithm with magic square is less than the time required for the CAST 128-bit algorithm with the matrix. Conversely, the proposed CAST with the matrix is higher than the CAST with the magic square. Both theoretical analysis and experimental results confirm that the two proposed enhancements to CAST perform effectively with sufficient security levels.

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Section: Related Workmentioning

confidence: 99%