Series of minor questions about OpenPGP 1

Peter Thomas p4.thomas at
Tue Jan 27 11:49:42 CET 2009

On Tue, Jan 27, 2009 at 4:57 AM, David Shaw <dshaw at> wrote:
> They should at least fail - a new style RFC-4880 (or 2440) packet (of any
> type) is unreadable by an old RFC-1991 program.  It simply won't be
> meaningful.  At to *how* it will fail, that depends on the program.
> The point of the Marker Packet is to force a graceful failure early.

> If there was such a situation, then forcing the use of a new packet header
> would certainly break old programs, but this isn't sufficient: most programs
> understand new packet headers, but they may not understand your new packet
> type.  Or put another way - you can't solve that problem with packet
> headers.
Ok,.. I see :-)

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