Abstract:
Today. More and more information has been
transmitted over the World. The information is not only text, but
also audio, image, and other multimedia Images have been
widely used in our daily life. This paper presents on efficient
chaos based feedback stream cipher (ECBSFC) for image
cryptosystems. The proposed stream cipher is based on the use
of ac chaotic logistic map and an external secret key of 256-bit.
The initial conditions for the chaotic logistic map are derived
using the external secret key by providing weight age to its bits
corresponding to their position in the key. Further, new features
of the proposed stream cipher include the heavy use of dataindependent
iterations, data-dependent inputs, and the inclusion
of three independent feedback mechanisms. These proposed
features are verified to provide high security level. A complete
specification for the proposed ECBFSC is given.
