Motahareh Taheri - Semnan University
Saeed Mozaffari

this paper presents a new hybrid approach to increase security of double random phase encoding. Double random phase encoding (DRPE) disarranges the input image bythe use of two keys which are random phase masks. Having these keys, the original image can be easily obtained using thereverse process, called decoding. To heighten its security, instead of sending two phase masks, Initial conditions and parameter of chaotic map and SHA-512 algorithm aretransferred to the authorized user through a secure channel and the encoded image is embedded into a host image. Atdestination, two random phase masks are generated by Hash function and chaos theory.. Experimental results show that the proposed method not only has high security but is resists to commonplace attacks.

double random phase encoding(DRPE); Hash function; SHA-512 algorithm; chaos theory; two-dimensional coupled Logistic map