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First off: openssl's options make my head spin :)

I have a file that I want to sign (foo.doc), and at some point in the future I want to prove the date/time the file was signed. How do I do this?

I followed some neat instructions on how to sign files, which was great, but after googling I can't find out how to verify its signed timestamp.

The "openssl dgst -sha256 -verify ..." works out fine, but not date is printed.

I'm using linux.

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You could use RFC 3161 "Internet X.509 Public Key Infrastructure Time-Stamp Protocol". openssl supports it with openssl-ts, ts - Time Stamping Authority tool

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