CAJ | 학술논문

为防御传统自同步序列密码中普遍存在的陒关攻击，以分组密码为新型序列源，提出一种基于分组密码的自同步序列密码模型。利用向量值函数的输出向量对分组密码的输出密文进行控选，以直接输出非陑性密钥流，并分析模型的平衡性与完全性，证明该模型的密钥流生成器具备平衡性，且其生成密钥流与控制向量统计独立。给出陑性移位寄存器状态改变1 bit密钥流概率的下界。实验结果表明，该模型可降低源信息在输出密钥流中存在的熵漏，较好地抵抗陒关攻击。
위방어전통자동보서렬밀마중보편존재적희관공격，이분조밀마위신형서렬원，제출일충기우분조밀마적자동보서렬밀마모형。이용향량치함수적수출향량대분조밀마적수출밀문진행공선，이직접수출비이성밀약류，병분석모형적평형성여완전성，증명해모형적밀약류생성기구비평형성，차기생성밀약류여공제향량통계독립。급출이성이위기존기상태개변1 bit밀약류개솔적하계。실험결과표명，해모형가강저원신식재수출밀약류중존재적적루，교호지저항희관공격。
To resist the correlation attack against the traditional self-synchronic stream cipher, based on a new stream source--the block cipher, a self-synchronic stream cipher model is given. To output nonlinear key stream directly, the output cipher text of the block cipher is controlled and selected by the output vector of the vector-valued function, and the balance and perfectibility of the model is analyzed. The balance of the key generator, and the statistical independence of the output key stream and the control vector is proved. The lower bound probability of the key stream transforming, while LFSR transforming 1 bit, is given. Experimental result show that the entropy leakage of the source information for the output key stream can be reduced, and the correlation attack can be resisted .