A Study of Lossless Compression and Encryption Scheme for Large Binary Image

• Main Authors: Chen-Chieh Lee, 李振杰
• Other Authors: Wei-Bin Lee
• Format: Others
• Language: en_US
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/4y8265

碩士 === 逢甲大學 === 資訊工程所 === 90 === Important information must be protected when transmitting through public network environments. Encryption is a good technique for protecting secret information and is also a general method. However the traditional cryptology techniques are not directly suitable to deal with digital images because there are two main differences between textual data and image data. One difference is that the size of image data is much greater than the size of textual data. The other difference is that the decrypted image allows little distortion. Therefore, it is necessary that proposes a new digital image encrypted scheme. In this thesis, we propose an efficient solution for the problem of the security of binary images according to the properties of digital images. We utilize a two-dimensional run-encoding (2DRE) technique to compress binary images, and then use scan patterns and flipping bits on it. Hence, our scheme not only has high security and a lower time complexity but also has a good compression ratio.