A proxy signature scheme with fast revocation based on elliptic curves

Based on the difficulty of the elliptic curves discrete logarithm problem,a new proxy signature scheme withfast revocation was proposed,and a security mediator(SEM) was introduced in the scheme to generate partial proxy signatures.Then by a designated proxy signer generated the complete proxy signature.A proxy signer must cooperate with the SEM to generate a valid proxy signature,which made the new scheme have an effective and efficient proxy revocation.