A new algorithm for the colored image encryption via the modified Chua’s circuit

Abstract

A genuine encryption/decryption algorithm has been developed by using a new chaotic circuit, namely modified Chua’s circuit (MCC). The importance of MCC is that it exhibits hyper-chaotic behaviour for a large parameter regime due to the double frequency dependent nature. The numbers extracted from the solutions of the MCC are transmitted to the newly developed algorithm for the encryption and the decryption aims. The scrambling feature, which is implemented at the bit level using the MCC has been applied in the algorithm. Following the encryption procedure, the encrypted colored image has been tested by a variety of tests including the secret key size, secret key sensitivity analysis, histogram analysis, correlation analysis, differential analysis, information entropy analysis, noise attack analysis and occlusion analysis. The results are good and provide an efficient technique for the color image encryption and decryption in the theme of secure communication. Besides, it is not time consuming.

Keywords

• Modified Chua’s Circuit
• Chaotic sequences
• Image encryption and decryption
• Bit level scrambling
• Color image