Abstract:

The most existing threshold proxy resignature schemes have one threshold value. In many practical applications, the number of proxies is often dependent on the significance of the message to be resigned, which requires the threshold value to be changeable. Based on Ateniese G’s proxy resignature scheme Sbi  and the Chinese remainder theorem, a flexible threshold proxy resignature scheme is proposed, and its security is proved. According to the changeable threshold value, each proxy can noninteractively produce the resignature private key and the verification public key. Compared with other existing schemes, this scheme can provide better efficiency in terms of the communication and computation cost.

Key words: flexible threshold proxy resignature;provable security;Chinese remainder theorem