On the validity of digital signatures

• Main Authors: ZHOU, Jianying, DENG, Robert H.
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2000
• Subjects: Digital signature; non-repudiation; secure electronic commerce; Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/134; https://ink.library.smu.edu.sg/context/sis_research/article/1133/viewcontent/505680.505684_pvoa.pdf
• Institution: Singapore Management University

An important feature of digital signatures is to serve as non-repudiation evidence. To be eligible as non-repudiation evidence, a digital signature on an electronic document should remain valid until its expiry date which is specified by some non-repudiation policy. As signature keys may be compromised and the validity of signatures may become questionable, additional security mechanisms need to be imposed on digital signatures. This paper examines the mechanisms for maintaining the validity of digital signatures, and provides a guideline on the use of these mechanisms in various context of applications.