discussion on increasing amount of gpg signatures...

[Florian Weimer]

Douglas Elznic <dfe@anize.org> writes:

>> IIRC, the most obvious challenge-response protocol (and the most
>> sensible one) for certifying keys has been patented, and I don't know
>> if the extension to cover (multiple) email addresses is enough to
>> bypass this patent.  (Just in case if you want to do this more
>> regularly.)

> What is the patented challenge response protocol?

I'm unable to find it right now.  There are quite a few US and
Japanese patents on a split registration/certification process, but I
didn't find the patent I was looking for.  (There might exist prior
art for the more complicated protocols, however.  Unfortunately,
Sebastian Korff's diploma thesis at the University of Stuttgart was a
bit too late, at least I think so. :-/)

However, someone should look at US Patent 6,134,550.  GnuPG's new
trust database might infringe on it.