CAJ | 학술논문

混沌系统具有良好的伪随机性、混频特性、对初始状态的敏感性和复杂的映射参数等特性,这些特性与密码学要求的产生伪随机信号、混乱和扩散、加、解密密钥的难以预测等属性是十分吻合的.近些年来,不少学者提出了多种基于混沌理论的密码算法,但对其安全性并没有详尽的分析.针对一种较新的基于 Feistel 结构的混沌分组密码,应用不可能差分的分析方法,在固定 S 盒的情况下对其安全性进行了分析,并在动态S盒的情况下说明了其安全性所在.
혼돈계통구유량호적위수궤성、혼빈특성、대초시상태적민감성화복잡적영사삼수등특성,저사특성여밀마학요구적산생위수궤신호、혼란화확산、가、해밀밀약적난이예측등속성시십분문합적.근사년래,불소학자제출료다충기우혼돈이론적밀마산법,단대기안전성병몰유상진적분석.침대일충교신적기우 Feistel 결구적혼돈분조밀마,응용불가능차분적분석방법,재고정 S 합적정황하대기안전성진행료분석,병재동태S합적정황하설명료기안전성소재.
Chaotic system has such fairly good features as pseudo-randomness, frequency mixing, sensitivity of the initial value, and complex mapping parameters, and these features are perfectly coincident with the crypto requirements, including the production of pseudo-random signal, chaos and diffusion, the unpredictability of encryption/decryption keys. In recent years, many scholars put forward various crypto algorithms based on chaos theory, but there is no detailed security analysis on these algorithms. Aiming at a new chaotic block cipher based on Feistel structure and under the condition of fixed S-box, the impossible differential analysis is used for its security, and where its security arises under the dynamic S-box is also explained.