ANSI ASC X9.95 Standard
The ANSI X9.95 standard for trusted timestamps expands on the widely used RFC 3161 - Internet X.509 Public Key Infrastructure Time-Stamp Protocol by adding data-level security requirements that can ensure data integrity against a reliable time source that is provable to any third party. Applicable to both unsigned and digitally signed data, this newer standard has been used by financial institutions and regulatory bodies to create trustworthy timestamps that cannot be altered without detection and to sustain an evidentiary trail of authenticity. Timestamps based on the X9.95 standard can be used to provide:
- authenticity: trusted, non-refutable time when data was digitally signed
- integrity: protection of the timestamp from tampering without detection
- timeliness: proof that the time of the digital signature was in fact the actual time
- an evidentiary trail of authenticity for legal sufficiency
A superset of the IETF's RFC 3161 protocol, the X9.95 standard includes definitions for specific data objects, message protocols, and trusted timestamp methods, such as digital signature, MAC, linked token, linked-and-signature and transient-key methods. X9.95 compliance can be achieved via several technological approaches, such as transient-key cryptography. Several vendors market X9.95-compliant systems.
Read more about ANSI ASC X9.95 Standard: Definitions, Creating A Timestamp, Verifying A Timestamp
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