Intrusion-Resilient Proxy Signature Schemes

• Main Authors: Ti-Wen Sun, 孫荻雯
• Other Authors: Wen-Guey Tzeng
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/43582078892031670781

碩士 === 國立交通大學 === 資訊科學系 === 91 === We proposed intrusion-resilient proxy signature schemes, which combine time bounded proxy signature schemes and signer-base intrusion-resilient signatures. First, we set up a home base that shares proxy parameters with the proxy signer, updates and refreshes the proxy signer’s key. Second, the original signer generates proxy parameters and then divides them into two parts. The first part of them is sent to the proxy signer and the second part is sent to the home base. The proxy signer and the home base check the validity of those parameters. If it is correct, they accept it; otherwise, they reject it. Before signing a message m, the proxy signer computes the proxy secret key with the home base’s help. After computing the proxy secret key, the signing and the verification stage are the same as those of time-bounded proxy signature schemes. We give two theorems to prove the security of our scheme by assuming hardness of the Strong-RSA problem.