CAJ | 학술논문

文章通过对签密方案的安全性分析，发现2个方案有共同的缺陷，即不满足公开验证性及不能抵抗不诚实接收者的一般性伪造攻击；在此基础上，针对2个原方案分别给出了改进方案，弥补了原方案的缺陷，并在随机语言模型下，对改进方案进行了安全性证明。结果表明，改进后的方案不但可公开验证、防伪造，而且其安全性更高。
문장통과대첨밀방안적안전성분석，발현2개방안유공동적결함，즉불만족공개험증성급불능저항불성실접수자적일반성위조공격；재차기출상，침대2개원방안분별급출료개진방안，미보료원방안적결함，병재수궤어언모형하，대개진방안진행료안전성증명。결과표명，개진후적방안불단가공개험증、방위조，이차기안전성경고。
Through the security analysis of two signcryption schemes ,it is found that both schemes can not meet the request for public verification and can not defend the forge by dishonest receiver .Then two improved schemes are proposed which make up the defects of original schemes .The security anal-ysis of the improved schemes is conducted under the random oracle mode .The result shows that the improved schemes are safer and meet the request for public verification and unforgeability .