so GnuPG's timestamping isn't an option for this? Even X509 has a timestamping feature for this kind of use.
On Fri, Dec 2, 2016 at 11:59 AM, Schlacta, Christ <aarc...@aarcane.org> wrote: > The easiest way is to publish your code to a publicly controlled source > with a signature on or before your desired date. Not sure if there's a > *better* way. > > On Dec 1, 2016 7:43 PM, "Bertram Scharpf" <li...@bertram-scharpf.de> > wrote: > >> Hi, >> >> we all know that kidnappers do publish a picture of their >> hostage holding up a todays newpaper. The purpose of this is >> to proof that the victim was alive _after_ a certain point >> of time. I want to do the opposite. I want to make evidence >> that I created a document _before_ a certain point of time. >> >> I could use self-darkening ink but that won't be reflected >> in a JPEG scan and my pen won't make the job that TeX does. >> I could sign a newspapers home page but that cannot be >> reproduced at a later point of time to verify the signature. >> >> Is there a standard way in GnuPG and in the keyholder >> infrastructure to accomplish this task? >> >> Thanks in advance. >> >> Bertram >> >> >> -- >> Bertram Scharpf >> Stuttgart, Deutschland/Germany >> http://www.bertram-scharpf.de >> >> _______________________________________________ >> Gnupg-users mailing list >> Gnupg-users@gnupg.org >> http://lists.gnupg.org/mailman/listinfo/gnupg-users >> > > _______________________________________________ > Gnupg-users mailing list > Gnupg-users@gnupg.org > http://lists.gnupg.org/mailman/listinfo/gnupg-users > > -- Regards, Quan Zhou +------------------------+ |pub [expires 2019-05-04]| |D7CF DCE8 2EBA 2766 499A| |20DF 8273 6C6F ABCD 0A0F| +------------------------+ |pub [revoked 2016-04-16]| |44D2 0307 1643 E80F 2E31| |F081 FAFA 6643 7F9F D46F| +------------------------+ |quanzhou...@gmail.com | |https://keybase.io/qzhou| +------------------------+
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