计算机应用与软件Issue(10)：309-313,5.DOI:10.3969/j.issn.1000-386x.2014.10.075
LEX算法的输出位置分析
ANALYSING THE OUTPUT LOCATIONS OF STREAM CIPHER LEX
摘要
Abstract
LEX is a candidate algorithm that may work in phase 3 of eSTREAM stream cipher project.The basic idea of it is to output from the AES cipher parts of the internal state as the keystream of LEX algorithm.We analyse the impact of the output locations on security of the LEX,examine the security of LEX in the circumstance that its output locations are the same in both the odd round and the even round,and apply the guess and determine attack to LEX cipher for analysis,when the 236.3 bytes keysteams sequence is known,the 128-bit initial key of LEX can be entirely recovered with only 281.4 round LEX encipher operations,which is far less than the current analysis result.This shows that the existing output locations of LEX are chosen reasonably.关键词
流密码/LEX算法/输出位置/猜测决定攻击Key words
Stream cipher/LEX cipher/Output location/Guess and determine attack分类
信息技术与安全科学引用本文复制引用
王秋艳,金晨辉..LEX算法的输出位置分析[J].计算机应用与软件,2014,(10):309-313,5.基金项目
国家自然科学基金项目（61272488，60272041）。 （）
