CAJ | 학술논문

为了解决密钥泄露问题,提出一个具有前向安全性的无证书代理签名方案.本方案采用密钥不断更新的方法,保证了代理签名方案的前向安全性,即当代理签名者的代理密钥泄露后,攻击者不能伪造当前时段以前的代理签名,从而减小了密钥泄露所带来的损失.同时本方案采用了无证书公钥密码体制,避免了基于证书密码系统的证书管理问题,解决了基于身份的密钥托管问题.
위료해결밀약설로문제,제출일개구유전향안전성적무증서대리첨명방안.본방안채용밀약불단경신적방법,보증료대리첨명방안적전향안전성,즉당대리첨명자적대리밀약설로후,공격자불능위조당전시단이전적대리첨명,종이감소료밀약설로소대래적손실.동시본방안채용료무증서공약밀마체제,피면료기우증서밀마계통적증서관리문제,해결료기우신빈적밀약탁관문제.
In order to deal with the key exposure problem, this paper proposed a forward secure certificateless proxy signature scheme. This new scheme was forward secure by updating secret key frequently. When the proxy signature secret key was stolen, the attacker could not forge the former proxy signature. And then reduced the loss, which caused by the key exposure to a great extent. Based certificateless public cryptosystem, it also overcame the problem of the certificate management in the certificate-based public key cryptosystem and the inherent key escrow problem in the identity-based public key cryptosystem.