Date Added: Sep 2011
Encryption is used to securely transmit data in open networks. Each type of data has its own features; therefore different techniques should be used to protect confidential image data from unauthorized access. In this paper, a fast partial image encryption scheme using Discrete Wavelet Transform with RC4 Stream Cipher is done. In this method, the approximation matrix (lowest frequency band) is encrypted using the stream cipher as it holds most of the image's information. The encryption time is reduced by encrypting only the part of the image and maintains a high level of security by shuffling the rest of the image using the shuffling algorithm.