Some Techniques for Enhancing Joint Compression and Encryption Schemes

• Main Authors: Chao-Jen Tsai, 蔡釗仁
• Other Authors: 吳家麟
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/bzb2tq

碩士 === 國立臺灣大學 === 資訊工程學研究所 === 105 === Three techniques for enhancing joint compression and encryption (JCAE) schemes are proposed. They respectively improve the execution time, compression performance and estimation accuracy of three different JCAE schemes. The first uses auxiliary data structures to significantly accelerate currently existing chaos-based join compression and encryption scheme. The second one solves the problem of huge multidimensional lookup table overheads by selecting a small number of important sub tables. The third increases the accuracy of frequency distribution estimations used for compressing streaming data by weighting symbols in the plaintext stream according to their position in the stream. Two joint compression and encryption schemes leveraging the above three techniques, one for static files and the other for streaming data, are proposed. Experiments results show that the proposed schemes run faster and generate smaller files than existing schemes, verifying that the three techniques are useful and practical.