CAJ | 학술논문

对肖鸿飞等人提出的基于身份的改进高效签密方案进行分析, 指出方案不能抵抗不可区分性选择明文攻击和不诚实接收者的一般性伪造攻击。为此, 提出了一个改进的签密方案。运用随机预言机模型, 证明了新方案在适应性选择密文攻击下是不可区分的和在适应性选择消息及身份攻击下是存在性不可伪造的, 安全性可以分别规约为判定双线性Diffie-Hellman问题和计算Diffie-Hellman问题。
대초홍비등인제출적기우신빈적개진고효첨밀방안진행분석, 지출방안불능저항불가구분성선택명문공격화불성실접수자적일반성위조공격。위차, 제출료일개개진적첨밀방안。운용수궤예언궤모형, 증명료신방안재괄응성선택밀문공격하시불가구분적화재괄응성선택소식급신빈공격하시존재성불가위조적, 안전성가이분별규약위판정쌍선성Diffie-Hellman문제화계산Diffie-Hellman문제。
Cryptanalysis of the improved efficient ID-based signcryption scheme which was proposed by Xiao, et al. shows that the scheme can't resist indistinguishability under chosen ciphertext attack and dishonest recipient's general forgery attack. This paper proposed an improved signcryption scheme to overcome these security problems. The new scheme had the indistinguishability against adaptive chosen ciphertext attacks property and was secure against an existential forgery for adaptive chosen messages and identity attacks in random oracle model, and the security was reduced to decisional bilinear Diffie-Hellman problem and computational Diffie-Hellman problem.