On Mon, Jan 26, 2009 at 11:31 PM, David Shaw <ds...@jabberwocky.com> wrote: > No, they don't have a concept of a packet type above 15. There are > only 4 type bits in the old-style packet header. :) Yes, that was clear
> Old programs will basically blow up if they see something they don't > understand. There is a special packet, the Marker Packet (tag 10) > which basically exists to make PGP 2.x print out "You need a newer > version of PGP" before PGP 2.x would blow up. My intention (and also behind the question whether there is something like the critical bit for packet types) is this: Suppose a new packet type (above 15) is added which is VERY critical for the security, meaning that it would be very very bad if some implementation isn't able to interpret it. Is it secured that those applications will blow up, give errors etc.? If not (and that was my motivation behind the general usage of new packet headers) it would be better if no packet type (even those below 16) are understood by these legacy applications and thus the whole key/message would be unusable for them. See what I mean? _______________________________________________ Gnupg-users mailing list Gnupg-users@gnupg.org http://lists.gnupg.org/mailman/listinfo/gnupg-users
