Abstract: To avoid abuse of proxy signing capabilities is a key problem in proxy signature. A proxy signature scheme with controlled proxy signing capability is proposed. In this scheme, the proxy signing times are designated by an original signer when he delegates his signing capability to the proxy signer. The proxy signer is unable to sign on behalf of the original signer for more than the designated proxy signing times, but it is easy for the original signer to revoke the proxy signing capability when needed. The proposed scheme can be used in electronic commerce and other fields.

Key words: digital signature, proxy signature, security