Enhancement of A5/1 encryption algorithm

[摘要] Mobiles have become an integral part of today's world. Various standards have been proposed for the mobile communication, one of them being GSM. With the rising increase of mobile-based crimes, it is necessary to improve the security of the information passed in the form of voice or data. GSM uses A5/1 for its encryption. It is known that various attacks have been implemented, exploiting the vulnerabilities present within the A5/1 algorithm. Thus, in this paper, we proceed to look at what these vulnerabilities are, and propose the enhanced A5/1 (E-A5/1) where, we try to improve the security provided by the A5/1 algorithm by XORing the key stream generated with a pseudo random number, without increasing the time complexity. We need to study what the vulnerabilities of the base algorithm (A5/1) is, and try to improve upon its security. This will help in the future releases of the A5 family of algorithms.

[发布机构] School of Computer Science and Engineering, VIT University, Vellore; 632014, India^1

[效力级别] 工业技术

[关键词] A5/1 algorithms;Encryption algorithms;Integral part;Mobile communications;Pseudo-random numbers;Time complexity;Various attacks