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2. Trusted timestamping - Wikipedia

   en.wikipedia.org/wiki/Trusted_timestamping

   PKI-based – timestamp token is protected using PKI digital signature. Linking-based schemes – timestamp is generated in such a way that it is related to other timestamps. Distributed schemes – timestamp is generated in cooperation of multiple parties. Transient key scheme – variant of PKI with short-living signing keys.

3. XAdES - Wikipedia

   en.wikipedia.org/wiki/XAdES

   An electronic signature that has been created in compliance with eIDAS has the same legal value as a handwritten signature. [2] An electronic signature, technically implemented based on XAdES has the status of an advanced electronic signature. [4] This means that it is uniquely linked to the signatory; it is capable of identifying the signatory;

4. Time stamp protocol - Wikipedia

   en.wikipedia.org/wiki/Time_stamp_protocol

   The timestamp is the signer's assertion that a piece of electronic data existed at or before a particular time. The protocol is defined in RFC 3161. One application of the protocol is to show that a digital signature was issued before a point in time, for example before the corresponding certificate was revoked.

5. 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.

6. 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.

7. Associated Signature Containers - Wikipedia

   en.wikipedia.org/wiki/Associated_Signature...

   When a mimetype file is included, it is required to be the first file in the ASiC container. This container type will allow additional signatures to be added in the future to be used to sign stored file objects. When long-term time-stamp tokens are used, ASiC Archive Manifest files are used to protect long-term time-stamp tokens from tampering ...