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Summary and comparison of ERS and X9.95 timestamping standards discussed at the 64th IETF meeting in Vancouver, highlighting their unique features and possible interoperability challenges. No syntax changes, minor updates only.
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Current Status • Version -03 released in October • Minor changes vs. version -02 • No syntax changes 64th IETF - Vancouver
Usage of X9.95 timestamps • Should ERS reference X9.95? • X9.95 defines five methods • RFC3161 is one • All are CMS-based. ERS includes timestamp as a ContentInfo • ERS text states that alternatives can be used • No change to current definitions required 64th IETF - Vancouver
Relationship to X9.95 • X9.95 defines an extension for use in timestamp request messages to enable clients to renew a timestamp • This is an alternative to ERS structure • Results in nesting of timestamps via extensions field of TSTInfo structures instead of SEQUENCE OF ArchiveTimestampChain • X9.95 does not accommodate grouping documents prior to timestamping • Uses hash trees to link with earlier timestamps 64th IETF - Vancouver
ERS/X9.95 Summary • ERS addresses different concerns than X9.95 (i.e., pre-timestamp generation data organization vs. timestamp protection) • The two can be used in tandem (though this could result in very complex validations) • Neither addresses inclusion of and preservation of validation information in the renewal chain 64th IETF - Vancouver