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.