An Image Encryption Decryption Method Using Secret Based Transformation Matrix

Due to the unlimited growth of Internet and communication technologies, the extensive use of images in diverse areas such as medical, military, science, engineering, art, entertainment, advertising, education has become unavoidable. With the increasing use of digital techniques for transmitting and storing images, the fundamental issue of protecting the confidentiality, integrity as well as the authenticity of images has become a major concern. This paper proposes a new encryption and decryption algorithm based on transformation matrix. According to this, there are two levels of process. In the first level the block matrix of size 3 x 3 is constructed using the secret key. In the second level, the zone of size 6 x 6 is constructed from the block matrix. The two levels are repeated to get the transformation matrix and is used for encryption purpose. The experimental results are compared with various image encryption algorithms.