A speech encryption using fractional chaotic systems

Abstract

In this paper, a new speech encryption using fractional chaotic systems is presented. A two-channel transmission method is used where the original speech is encoded using a nonlinear function of the chaotic states. Conditions for synchronization between fractional chaotic systems through one variable have been investigated theoretically by using the Laplace transform. The keys, key space, key selection rules, and sensitivity to keys are discussed in detail. Results show that the original speech is well masked in the ciphertexts yet recovered faithfully and efficiently by the present schemes.

Chaos synchronization in fractional differential systems

“…In the study by Li & Deng [68], the Laplace transform method was applied to investigating CS of the fractional Lorenz systems (x, y, z) in the PC coupling configuration, where (x, z) were driven by y. For coupled fractional Lorenz systems, CS can also be achieved if the driving signal is selected as x [69], i.e. CS of fractional Lorenz systems can be realized using driving signal x or y, which is in accordance with the case of integer-order Lorenz systems [25].…”

Multimedia Security: A Survey of Chaos-Based Encryption Technology

“…13. The audio encryption scheme in (Gnanajeyaraman et al, 2009) Sheu (Sheu, 2011) presented a two-channel chaos-based speech encryption using fractional Lorenz system for speech communication (henceforth called TCSE). The TCSE can achieve large key space, high key sensitivity, and the ability to resist chosen plaintext/ciphertext attack.…”

Speech encryption using chaotic shift keying for secured speech communication

“…Chaoticbased cryptographic functions follow deterministic dynamics, non-guessable behavior with non-linear functions and chaos properties [5][6][7]. Chaotic-based cryptography combines the traditional cryptographic techniques and the chaotic synchronization to enhance the degree of security [8][9][10][11][12][13][14]. In this paper, higher degree of security is achieved by multiple level of permutation process on sampled speech at five levels using five different chaotic maps.…”