題名: Cryptanalysis of A New Multi-Proxy Multi-Signature Scheme 作者: 孫宏民;謝濱燦;林宸堂
貢獻者: 成功大學資訊工程系;資訊工業策進會網路及通訊實驗室
關鍵詞: proxy signature;multi-proxy multi-signature;multi-proxy signature;proxy multi-signature
日期: 2002-05-16
上傳時間: 2009-12-08T07:38:20Z 出版者: 亞洲大學
摘要: Recently, Hwang and Chen [5] proposed a variation of proxy signature scheme called the multi-proxy multi-signature scheme. In their scheme, an authorized group of proxy signers is allowed to sign message on behalf of a group of original singers. In this paper, we show that their multi-proxy multi-signature scheme is insecure against a kind of forgery attack in which an attacker can easily forge the signature for an
arbitrary message. Furthermore, we also point out that the multi-proxy signature scheme in [2] also suffers from the same security flaw.