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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...
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