Abstract
Most current image encryption algorithms directly confuse and/or diffuse the image pixels only in spatial domain which results in reducing storage efficiency and making the cipher-image incompressible. In this paper, we introduce a new color image encryption scheme based on the hash function SHA-512, discrete wavelet transform (DWT) and chaotic maps with excellent performance. Combining with the plain-image and the secret keys, the SHA-512 is employed to generate the new keys. In the proposed algorithm, both the 2D-LASM and the 2D-SIMM are used to generate the keystreams, where the initial values and parameters are produced by the SHA-512 hash value. The single-level DWT is applied to decompose the plain-image into four image sub-bands. Then these sub-bands are shuffled, minified, reversed and swapped by the keystreams. The image after inverse discrete wavelet transform (IDWT) reconstruction is further divided and diffused using the keystreams (more than 2349) in spatial domain. Experimental results and performance analysis demonstrate the proposed scheme is an efficient, secure and robust encryption mechanism. Besides, the duration of the experiment was relatively short and required only 0.3628 s on average.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
