Two Improved Encryption Algorithm And Applications

Nowadays, e-mail has become an important part of life. However, with the striking development of web technology, hacker technology also goes to a further step, which make e-mail security problem far more crucial. As we all know that data transferring by Internet are not encrypted. So if we do not encryption work, someone else can easily acquire our secrets. As the result, gradually, encryption technology has become a key role in solving the information security on network. Also, it is the identification and the encryption protection of transmission and storage integrality and undeniability in information network security that need to use password technology to be solved. Under all the circumstance, the famous PGP plaintext protect system has been brought out.However, after Prof. Wang Xiaoyun from Shandong University has successfully deciphered MD5 algorithm, PGP does not perform as perfectly as before. In order to figure out this special problem, and make a better performance, I here mainly bring forward one new 160-bit symmetric encryption algorithm, named: IEC, basing on kernel encryption function called S (). By incising 160 bits data block into little pieces, S () function produces one fresh new 160 bits data block after doing series of continuous iteration, encryption, and reunion. Computers show that: without increasing the time complexity, new algorithm improves the security better comparing with DES and IDEA algorithms.Basing on original PGP, combining with other 160-bit algorithm such as: asymmetric algorithm DSA, Hash MD5plus algorithm, I here use 160-bit IEC algorithm instead of primary 128-bit kernel algorithm IDEA. In additional, by using data exchanging and mutation, finally forms a brand-new plaintext protect system called: NPGP. It not only has surmounted the problem of MD5 in original PGP, but also shows in computers that there is obvious improvement in the integral security performance.