Chaos-based crypto and joint crypto-compression systems for images and videos
Mousa Farajallah · HAL (Le Centre pour la Communication Scientifique Directe) · 2015
The security of image and video data is important formany applications which require in real-time a highsecurity level. In the first part of this work, fourchaos-based cryptosystems, flexible, efficient, andmore robust against cryptanalysis, are designed andrealized. The first two cryptosystems are based on thesubstitution-permutation network. The substitution isachieved by a proposed modified Finite Skew TentMap (FSTM) to overcome various problems: fixedpoint, key space restriction, and limitation of mappingbetween plaintext and ciphertext. The thirdcryptosystem is a new and efficient structure. It isbased on a binary diffusion layer of pixels, followed bya bit-permutation layer. The permutation is achievedby an efficient proposed formulation of the 2-D catmap. The fourth cryptosystem is faster than theothers, having a very high security level. Theconfusion and the diffusion are performed in a singlescan. Its design is based on a partial cryptanalysisthat we performed on the Zhang algorithm. In thesecond part, two fast and secure selectivechaos-based crypto-compressions are designed andrealized to secure the High Efficiency Video Coding(HEVC) and its scalable version. In the firstcrypto-compression, a new algorithm is proposed todefine the encryptable bits in the bit stream of theHEVC and the SHVC systems. The proposed solutionencrypts a set of sensitive SHVC parameters at theentropy encoder (CABAC), while preserving all SHVCfunctionalities. Based on the tile concept, the secondproposed crypto-compression provides protection ofthe ROI defined in the standard HEVC.