supported in part by the National Natural Science Foundation of China(No.61262057,No.61063041,No.61163038);the Young Teachers’Scientific Research Ability Promotion Program of Northwest Normal University(No.NWNU-LKQN-10-22)
To improve the performance of threshold proxy re-signatures, the notion of on-line/off-line threshold proxy re-signatures is introduced. The bulk of re-signature computation can be done in the off-line phase before th...
This work is supported by the National Natural Science Foundation of China (No.60503006, No.60573039) and Program of Science and Technology of Guangzhou, China (No.2008J1-C231-2).
It seems that all existing on-line/offline (threshold) signature schemes based on Shamir- Tauman's paradigm suffer from the key exposure problem of chameleon hashing. In this paper, we firstly propose a new efficie...