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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.
The requestor now has evidence that the data existed at the time issued by the TSA. When verified by a verifier or relying party, the timestamp token also provides evidence that digital signature has existed since the timestamp was issued, provided that no challenges to the digital signature's authenticity repudiate that claim.
XAdES-B-T (Signature with a timestamp), A timestamp regarding the time of signing is added to protect against repudiation. XAdES-B-LT (Signature with Long Term Data), Certificates and revocation data are embedded to allow verification in the future even if their original source is not available.
ISO/IEC 20248 calls the digital signature meta structure a DigSig envelope. The DigSig envelope structure contains the DigSig certificate identifier, the digital signature and the timestamp. Fields can be contained in a DigSig envelope in 3 ways; Consider the envelope DigSig{a, b, c} which contains field sets a, b and c.
Linked timestamping is inherently more secure than the usual, public-key signature based time-stamping. All consequential time-stamps "seal" previously issued ones - hash chain (or other authenticated dictionary in use) could be built only in one way; modifying issued time-stamps is nearly as hard as finding a preimage for the used cryptographic hash function.
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.
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