interop/encryption to pgp2

[Ingo Luetkebohle <ingo@xxxxxxxxxxxxxx>]

Hi,

David Shaw just pointed out that PGP2.6.2 chokes when it receives a
message that has been encrypted to a v4 key, even when it has been
encrypted to a v3 key, too. 

I can only assume that this is because public-key encrypted session
key packets allow non-RSA cipher material.  Can anybody who has a
working knowledge of the old code confirm this?

If this is the case, would it be possible to introduce a v4 packet of
that type? Would that be ignored by PGP2, so that having both v3 and
v4 public key encrypted session key packets would work with pgp2?

Ingo

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