近些年来，eSTREAM, SHA-3, CAESAR计划等一系列密码算法征集活动的开展极大地推动了密码学的发展进程，其中一类仅由模加运算、(循环)移位运算、异或运算、比特布尔运算(与、或、非)构成的轻量级分组密码算法以其简单、安全、软硬件实现的高效性等特点赢得了密码设计者的青睐。本项目拟从设计和分析两个角度对此类轻量级分组密码算法进行研究。分析方面，拟研究此类算法抵抗差分、线性、不可能差分、零相关线性、积分等攻击方法的能力，以及各种不同类型区分器之间的相互关系，据此对该类算法进行更加深入的安全性评估。设计方面，拟结合分析结果，考察模块重组和参数调整对算法安全强度的影响，为此类算法的设计准则提供参考和理论依据。该类算法的研究对于丰富分组密码算法的设计与分析理论具有重要意义。

Over recent years, some projects such as eSTREAM, SHA-3, CAESAR have greatly enhanced the progress of cryptology. Among these projects, a class of lightweight block ciphers which consist of modular addition, rotation, shift, XOR or bitwise Boolean operations such as AND, OR, NOT has attracted the attention of algorithm designers for their briefness, safeness and high efficiency in both software and hardware　platforms. This project aims to investigate the security for this kind of block ciphers from two perspectives - design and cryptanalysis. In the perspective of cryptanalysis, the security level for this kind of block ciphers against various attacks such as differential cryptanalysis, linear cryptanalysis, impossible differential cryptanalysis, zero correlation linear cryptanalysis and integral attacks will be evaluated, and the　relationship between different distinguishers will be studied. This will make a better security evaluation for this kind of block ciphers. In the　perspective of design, the influence of security level for module reorganization and parameter modification will be considered, which will　provide scientific basis and guidance for the design of this kind of ciphers. This research is of great significance to enrich the design　and cryptanalytic theories of block ciphers.