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For applications using digitally signed data, the requestor signs the digital hash with its private key and submits the digital signature to the TSA, which performs the same operations as in the previous example: bind the submitted data with a timestamp using its cryptographic binding and return the results to the requestor.
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.
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.
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is to show that a digital signature was issued before a point in time, for example before the corresponding certificate was revoked.
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.
The additional attributes of the signatures (e.g., the embedded certificate status information, time-stamps or evidence records) allow a wide applicability of this format. Since the initial standardisation, the associated interface extensions for the XAdES and CAdES formats are defined by the “AdES-Profile”.