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- Title
An audio encryption based on distinct key blocks along with PWLCM and ECA.
- Authors
Naskar, Prabir Kumar; Bhattacharyya, Surojit; Chaudhuri, Atal
- Abstract
This paper presents a robust audio encryption scheme based on three consecutive phases, accomplished as cyclic shift followed by ciphering and wound up by shuffling, to break the high correlation amongst the neighbouring region of a plain audio. To encrypt a plain audio, the entire audio is split into different blocks of 64 bytes each and distinct key blocks are used for those audio blocks in the foregoing three phases. At first, the correlation of each audio block is reduced by the cyclic shift; thereafter, these shifted blocks are ciphered with piecewise linear chaotic map (PWLCM) along with elementary cellular automata (ECA) and finally, turns up with shuffling of ciphered bytes for better diffusion. The significant feature of this scheme is to generate distinct key blocks, which are highly sensitive to the secret key, a combination of the 64-byte external key along with the plain audio-dependent value. Moreover, these key blocks are derived using PWLCM from the secret key along with the preceding key block and previous encrypted block to achieve resistance against the known plain-text attack. It uses key space as large as 2 576 to resist brute-force attacks. The robustness as well as competence of this scheme is established with statistical analyses, cryptanalysis, randomness analysis and comparisons with existing schemes.
- Subjects
BLOCK ciphers; LINEAR operators; CELLULAR automata; STATISTICS; CRYPTOGRAPHY
- Publication
Nonlinear Dynamics, 2021, Vol 103, Issue 2, p2019
- ISSN
0924-090X
- Publication type
Article
- DOI
10.1007/s11071-020-06164-7