Extended of TEA (ETEA): A 256 bits block cipher algorithm for image encryption

Abeer F. Shimal, Baydaa H. Helal, Ashwaq T. Hashim

Abstract


This paper introduces an effective image encryption approach that merges a chaotic map and polynomial with a block cipher. According to this scheme, there are three levels of encryption. In the first level, pixel positions of the image are scuffled into blocks randomly based on a chaotic map. In the second level, the polynomials are constructed by taking N unused pixels from the permuted blocks as polynomial coefficients. Finally, the third level a proposed secret-key block cipher called extended of tiny encryption algorithm (ETEA) is used. It is an evolutionary enhancement of 64 bit tiny encryption algorithm (TEA) block cipher which is intended to encounter the necessities of increasing safety and enhancing performance for image encryption. The proposed ETEA algorithm increased the block size from 64 bit to 256 bit by using F-function in type three Feistel network design. The key schedule generation is very straightforward through admixture the entire major subjects in the identical manner for every round, so that the proposed system attempts to generate subkeys that were changed for each round. The proposed ETEA algorithm is word-oriented, where wholly internal operations are executed on words of 32 bits. So it is possible to efficiently implement the proposed algorithm on smart cards. The results of the experimental demonstration that the proposed encryption algorithm for all methods are efficient and have high security features through statistical analysis using histograms, correlation, entropy, randomness tests, and the avalanche effect.


Keywords


block cipher; chaotic map; cryptography; image encryption; polynomial; TEA encryption;



DOI: http://doi.org/10.11591/ijece.v11i5.pp%25p

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International Journal of Electrical and Computer Engineering (IJECE)
p-ISSN 2088-8708, e-ISSN 2722-2578