High-performance multimedia encryption system based on chaos

Abstract

Current chaotic encryption systems in the literature do not fulfill security and performance demands for real-time multimedia communications. To satisfy these demands, we propose a generalized symmetric cryptosystem based on N independently iterated chaotic maps (N-map array) periodically perturbed with a three-level perturbation scheme and a double feedback (global and local) to increase the system's robustness to attacks. The first- and second-level perturbations make cryptosystem extremely sensitive to changes in the plaintext data since the system's output itself (ciphertext global feedback) is used in the perturbation process. Third-level perturbation is a system reset, in which the system-key and chaotic maps are replaced for totally new values. An analysis of the proposed scheme regarding its vulnerability to attacks, statistical properties, and implementation performance is presented. To the best of our knowledge we provide a secure cryptosystem with one of the highest levels of performance for real-time multimedia communications.

Partial Encryption of Entropy-Coded Video Compression Using Coupled Chaotic Maps

“…Perturbation-based schemes transform stable chaotic cycles into non-stable ones by perturbing the trajectory, as performed in [3]. A network of chaotic maps or coupled map lattices (CML), on the other hand, considers an array of chaotic maps governed by a coupling transformation over some defined neighborhood in the array [20]. In this work, we use CML to develop a PRNG that is robust to ciphertext, known/chosen plain text and differential attacks.…”

“…We also chose the earlier AES implementation by Gladman [30] and PolarSSL [25]. For chaotic encryption, we chose the Hasimoto [20] scheme. We did not compare our scheme with other selective encryption schemes, as they require the modification of media encoders/decoders.…”

Performance evaluation of different encryption schemes on portable and mobile platforms

“…Energy consumption of traditional encryption schemes such as DES, RC, IDEA, GOST, and (different implementations of) AES has been analyzed in [2][3][4][5]. The energy consumption of for DES, GOST, and IDEA was evaluated in [2], and found to be proportional to the number of rounds used in the encryption process.…”

“…Traditional encryption schemes have also been evaluated on a joint effort between security and wireless network throughput in order to decrease the overall energy consumption during transmission [4]. Recently, nontraditional encryptions schemes, particularly those based on Chaotic Maps [5] have been proposed. While such schemes --shown to be equally robust in terms of security properties--have not been formally tested and compared against the traditional ones.…”

“…Regardless of this, it is foreseen as a viable alternative to traditional encryption schemes, especially for real-time multimedia applications. The main goal of this work is to evaluate the performance and energy consumption of popular AES implementations [7][8][9] and the nontraditional chaotic encryption scheme proposed in [5] on mobile devices (notebook, netbook, and PDAs). The analysis is performed on a diverse set of platforms and experimental results are reported for multiple encryption schemes under different usage scenarios.…”