Secure Time Stamping
Secure time stamping involves a trusted time authority associating a time stamp with a particular piece of data with the properties of authenticity and integrity. What is important is not so much the actual time format itself, but rather the security of the time/data association. In particular, for some applications the time stamp need not explicitly represent time at all; a simple sequence number demonstrating that this document was presented to the authority before document x and after document y may be sufficient. However, any interested parties must be able to verify that the time stamp associated with this document is authentic and has integrity.
The time stamp authority is also not strictly required for this service. ...
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