New CA Based Image Encryption-Scaling Scheme Using Wavelet Transform

Abstract

The wide use of digital images leads to the necessity of securing them when they enter into an insecure channel. Image cryptography plays a vital role in the modern communication. In this paper we propose a new image encryption scaling scheme, which will do both, image scaling and encryption. Cellular automata is used for key generation and wavelet transformation is used for image scaling. Encryption has been done in two steps: one before wavelet transformation and another one after the wavelet transformation. Performance evaluation results clearly show that the proposed method is better in all aspects.

Keywords

• image scaling
• image encryption and decryption
• Elementary cellular automata (ECA)
• wavelet transformation