公开(公告)号：US20010008013A1

公开(公告)日：2001-07-12

申请号：US09773665

申请日：2001-02-02

Applicant: Certicom Corp.

Inventor： Donald B. Johnson ,  Scott A. Vanstone ,  Minghua Ou

IPC: H04L009/30

CPC classification number: H04L9/3247 ,  G06Q20/341 ,  G06Q20/40975 ,  G07F7/1008 ,  H04L9/3066 ,  H04L9/3252 ,  H04L2209/04

Abstract: The present invention relates to digital signature operations using public key schemes in a secure communications system and in particular for use with processors having limited computing power such as nullsmart cardsnull. This invention describes a method for creating and authenticating a digital signature comprising the steps of selecting a first session parameter k and generating a first short term public key derived from the session parameter k, computing a first signature component r derived from a first mathematical function using the short term public key, selecting a second session parameter t and computing a second signature component s derived from a second mathematical function using the second session parameter t and without using an inverse operation, computing a third signature component using the first and second session parameters and sending the signature components (s, r, c) as a masked digital signature to a receiver computer system. In the receiver computer system computing a recovered second signature component s' by combining a third signature component with the second signature component to derive signature components (snull, r) as an unmasked digital signature. Verifying these signature components as in a usual ElGamal or ECDSA type signature verification.