Patent ID: 6081610
Filing Date: 2000-06-27
Classification: G06F,G07C,G07F

Abstract:
A signature verification method for use with a hardcopy document which is to bear a signature by a customer, the customer having a secure private key, the customer's private key corresponding with a publicly available public key, the method comprising the steps of:generating a digital signature, employing the customer's private key; the signature being based on the content of the hard-copy document, the step of generating employing an existentially unforgeable signature schemeassociating the signature with the hard-copy document;decoding the signature based on the customer's public key, thereby verifying that the customer signed the hard-copy document because the customer's private key was used; andverifying the content of the hard-copy document against the decoded signature, thereby verifying that the signature was made for the hard-copy document.