Journal
INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS
Volume 20, Issue 8, Pages 2561-2568Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0218127410027192
Keywords
Chaos; image; encryption; cryptanalysis; differential attack
Funding
- Hong Kong Polytechnic University [G-YX2L]
- Research Grant Council of the Hong Kong SAR Government [523206, PolyU 5232/06E]
- CDTI, Ministerio de Industria, Turismo y Comercio of Spain in collaboration with Telefonica I+D [CENIT-2007-2004]
- CDTI, Ministerio de Industria, Turismo y Comercio of Spain in collaboration with SAC
- Ministerio de Ciencia e Innovacion of Spain [MTM2008-02194]
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Recently a chaotic cryptographic scheme based on composition maps was proposed. This paper studies the security of the scheme and reports the following problems: (1) the scheme can be broken by a differential attack with 6 + [log L (MN)] chosen plaintexts, where MN is the size of the plaintext and L is the number of different elements in plaintext; (2) the two composition maps both do not work as a secure and efficient source of random numbers; (3) the scheme is not sensitive to the changes of the plaintext.
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