02890nam a2200385 4500 20260817173347.0 010898 th eng .b10151229 AIT Thesis no.CS-93-08 Lin, Yu-tsu A comparative study of data compression techniques with encryption Bangkok : Asian Institute of Technology, 1993 76 leaves + 1 online resource Thesis ; no. CS-93-8 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1993 Huffman compression is one of the statistical compression mechanism, and is also a more simple algorithm than the others. Using the. dynamic tree coding and decoding, the compressor and expander can compress and expand the file easily. Because only when the probability of symbol's appearance is the integer power of 0.5, using Huffman compression can get a good efficiency. Since it is ·difficult to get such good situation, therefore, we combined the ideas of bit map and pattern substitution with Huffman algorithm, and made a little modification of them to implement two programs. Because of the characteristics of un-fixed length code encoded by Huffman way, the serial data can be decoded easily if the data is stolen on the transmission line. Therefore, in order to encourage the text transmission, we add an encryption, using bit cipher method after Huffman encoding, and using character cipher way to see if it will affect the compression efficiency. From the transmission viewpoint, we also have done a file communication experiment employing a software transfer package, named Telix. Our main purpose of this experiment is to compare the total efficiency of our programs with the software of others, such as Zip, Lzss, MNP-5, and so on. Data compression (Computer science) Yulu, Qi, Chairperson Huynh, Ngoc Phien, Examination Committee Phan, Minh Dung, Examination Committee R.O.C. Government, Scholarship donor Asian Institute of Technology. Thesis ; no. CS-93-8 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16104 .b10151229 mnait x 240610 2 951012 m a x 2 mnait mnarc 22 40 Barcode : 30050120686455 CREATED : 2014-02-13 RECORD # : i12764553 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120357115 CREATED : 2016-06-13 RECORD # : i13034443 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 19695 19695 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.CS-93-08 30050120686455 2026-08-17 17:33:47 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.CS-93-08 30050120357115 2026-08-17 17:33:47 2026-08-17 40