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Issue No:5 Vol.4 |
May -2011 |
ISSN: 0974-5645 |
| RESEARCH ARTICLES |
Viewers & PDF |
| 27. Symmetric key chaotic image encryption using circle map. D. Chattopadhyay, M. K. Mandal and D. Nandi. Indian J.Sci.Technol. Vol.4, Issue 5, pp: 593-599. |
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- Abstract
The security of information and digital images has become a major issue during the last three decades. A large number
of algorithms for data and image encryptions are reported in the literature. However, many of the proposed algorithms
are not suitable in the fields of application, because they are cryptographically weak. In the present work, a novel
algorithm for encoding digital images by using a circle map with 3 parameters has been proposed. In this article
different images are used for testing the validity of the proposed algorithm. The algorithm has increased the strength of
security of the image encryption against cipher-text-only, chosen-plaintext and chosen-cipher-text attacks. The analysis
of cryptographic strength has also been performed to confirm the fact. The results of several experimental tests, such
as, key space analysis, key sensitivity analysis and statistical analysis show that the proposed algorithm for image
cryptosystems provides an efficient and secure way for image encryption. A comparison in terms of correlation
between the initial and transformed images, number of pixels change rate (NPCR) and unified average changing
intensity (UACI) is also done.
- Keywords: Circle map, Chaos, Lyapunov exponent, anti-differential attack, NPCR, UACI.
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