A Model For Signature Revocation
Rui Zhang, Michiharu Kudo, Kanta Matsuura, Hideki Imai · 2002
This paper introduces the important concept of signature revocation. An important property of digital signature is nonrepudiatability that a signer can't deny his legal signature. However, in some occasion a signer wants to take back his previously singed signature in a proper legal way, so that after certain interaction a signature can be regarded as invalidate. We originate a new study of instance management regarding digital signature and develop the definition of security requirements. We show under some careful treatments the non-repudiatability can be removed from the original signature. Our scheme is simple and effective. We also give a proof that our scheme is as secure as the underlying signature scheme.