Digital time-stamping of PKI

This paper begins with introduction of the necessity of digital time-stamping and presents the basic requirements and possible problems inherent to the process and methods and techniques for solving these problems, then follows the introduction of digital time-stamping and its flow of fetching it. And it continues to discuss the reliability and anonymity of digital time-stamping. It also presents some methods of time-stamping that reduce the verification time of a stamp.