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2. Trusted timestamping - Wikipedia

   en.wikipedia.org/wiki/Trusted_timestamping

   ANSI ASC X9.95 Standard for Trusted Time Stamps; ETSI TS 101 861 V1.4.1 Electronic Signatures and Infrastructures (ESI); Time stamping profile; ETSI TS 102 023 V1.2.2 Electronic Signatures and Infrastructures (ESI); Policy requirements for time-stamping authorities; Analysis of a Secure Time Stamp Device (2001) SANS Institute

3. ANSI ASC X9.95 Standard - Wikipedia

   en.wikipedia.org/wiki/ANSI_ASC_X9.95_Standard

   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 ...

4. Digital Postmarks - Wikipedia

   en.wikipedia.org/wiki/Digital_Postmarks

   A Digital Postmark (DPM) is a technology that applies a trusted time stamp issued by a postal operator to an electronic document, validates electronic signatures, and stores and archives all non-repudiation data needed to support a potential court challenge. It guarantees the certainty of date and time of the postmarking.

5. Time stamp protocol - Wikipedia

   en.wikipedia.org/wiki/Time_stamp_protocol

   It is a request-response protocol, where the request contains a hash of the data to be signed. This is sent to the TSA and the response contains a Time Stamp Token (TST) which itself includes the hash of the data, a unique serial number, a timestamp and a digital signature. The signature is generated using the private key of the TSA.

6. CAdES (computing) - Wikipedia

   en.wikipedia.org/wiki/CAdES_(computing)

   This level combines the old -BES and -EPES levels. This form extends the definition of an electronic signature to conform to the identified signature policy; CAdES-T: B-Level for which a Trust Service Provider has generated a trusted token (time-mark or time-stamp token) proving that the signature itself actually existed at a certain date and time.

7. Digital signature - Wikipedia

   en.wikipedia.org/wiki/Digital_signature

   A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature on a message gives a recipient confidence that the message came from a sender known to the recipient. [1] [2]