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Static disassembly is used to analyze program control flow that is the key process of reverse analysis. Aiming at the problem that attackers are always using static disassembly to analyze control transfer instructions and control flow graph, a mixed obfuscation of overlapping instruction and self-modify code based on hyper-chaotic opaque predicates is proposed, jump offsets in overlapping instructions...
Recently, a spatiotemporal chaotic image/video cryptosystem was proposed by Lian. Shortly after its publication, Rhouma et al. proposed two attacks on the cryptosystem. They as well introduced an improved cryptosystem which is more secured under attacks (R. Rhouma, S. Belghith, Phys. Lett. A 372 (2008) 5790) [29]. This Letter re-examines securities of Lian's cryptosystem and its improved version,...
After comprehensive analysis of attacks proposed by Rhouma on Gao algorithm, limitations of the attacks are introduced — Rhouma's chosen plaintext attack (CPA) and chosen ciphertext attack (CCA) aren't suitable for breaking Gao algorithm when the size of ciphered image is in excess of 255×255. Then, an extended version of Rhouma's CPA and a new CCA are proposed to deal with ciphered image of arbitrary...
In order to solve the problems of Gao algorithm, an improvement of Gao algorithm is proposed in this paper. Firstly, the shuffling procedure is combined with pixel diffusion to solve the problem that permutation isn't relative to the pixel values in Gao algorithm. Secondly, to solve the problem that the keystream isn't sensitive to plaintext in Gao algorithm, the feedback mechanism is introduced in...
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