Problem with faked-system-time option

Jerome Baum jerome at
Tue Jun 14 22:19:24 CEST 2011

>> You should tell apart who has to prove something. Your
>> argument is valid if the signer has to prove that he
>> has made the signature at (or before or after) a
>> certain date and time. His own signature is no proof in
>> that case as he can easily fake the timestamp.
>> If a third party has to prove that and when the signer
>> has signed a document then the signature timestamp is
>> perfectly OK.
> Suppose the party who originated the document to be signed
> subsequently presents (possibly faked) evidence showing the document
> to have been prepared later than the signature timestamp. The signer
> is now unexpectedly in the position of having to prove something.

Not really, without any context. Nobody has to prove anything without
that context.

Jerome Baum
tel +49-1578-8434336
email jerome at
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