中文摘要 |
By appending some bits to the original signature, a trapdoor hash function converts any signature scheme into secure signature scheme with very efficient online computation. Many of them have been proposed. The paper presents three new trapdoor hash functions with promotion in offline computation, online computation, appended bits, and the size of trapdoor key (but with longer public key). While the appended bits is shortened half (or more), the efficiency of online computation is doubled or more. These features make it suitable for mobile environment and real-time application. |