Proxy signature allows one user to delegate his signing capacity to other
people. No proxy signature scheme based on the widespread RSA cryptosystem was proposed
until 2003. However, the first RSA-based (t, n) threshold proxy signature scheme
suffers from some drawbacks: (1) the original signer?s private key can be derived and
(2) the delegates? identities need to be chosen carefully. In this paper, we will propose
an improved RSA-based (t, n) threshold proxy signature scheme with free-will identities
and without the help of the trusted combiner. Moreover, the proposed scheme ensures
the proxy signers? partial anonymity to provide the real proxy signers? privacy for safety,
and no proxy signing key will be retrieved by the cooperation of the proxy signers.
Relation:
International Journal of Innovative Computing, Information and Control 8(2):33-42
