ISO 14533-4:2019
Processes, data elements and documents in commerce, industry and administration -- Long term signature profiles-- Part 4: Attributes pointing to (external) proof of existence objects used in long term signature formats (PoEAttributes)
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This document specifies the elements defined in the international standards of ISO/ITU-T, ETSI and IETF RFC that enable at least a proof of existence of data objects and digital signatures and the preservation of the validity status of digital signatures over a long period of time used in validation.It provides the definitions of the proof of existence (PoE) attributes and clarification of the usage of (external) PoE objects, with digital signatures and trusted time values, which have already existed and can be used by the PoE attributes pointing to (external) PoE objects used in long term signature validation or preservation.