On the security of a new image encryption scheme based on chaotic map lattices.
This paper reports a detailed cryptanalysis of a recently proposed encryption scheme based on the logistic map [A. Pisarchik et al., Chaos 16, 033118 (2006)]. Some problems are emphasized concerning the key space definition and the implementation of the cryptosystem using floating-point operations. It is also shown how it is possible to reduce considerably the key space through a ciphertext-only attack. Moreover, a timing attack allows for the estimation of part of the key due to the existent relationship between this part of the key and the encryption/decryption time. As a result, the main features of the cryptosystem do not satisfy the demands of secure communications. Some hints are offered to improve the cryptosystem under study according to those requirements.
Arroyo
David
D
Instituto de Física Aplicada, Consejo Superior de Investigaciones Científicas, Serrano 144-28006 Madrid, Spain. david.arroyo@iec.csic.es
Rhouma
Rhouma
R
Alvarez
Gonzalo
G
Li
Shujun
S
Fernandez
Veronica
V
D000465:Algorithms; D016494:Computer Security; D003198:Computer Simulation; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods*; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012815:Signal Processing, Computer-Assisted