dh key exchange via ascii email?

[Doug Barton]

On 03/22/2013 08:16 PM, Ileana wrote:
> Hello,
>
> I am curious if there is a built-in or optional way to do a
> diffie-hellman key exchange over PGP encrypted email.  Such that
> subsequent emails could be forward secret?
>
> Is there some program already out there that each party can use to
> generate ascii cut and paste primes and factors?  It seems like it
> would be a simple program to write.

What you want sounds similar to OTR:

http://www.cypherpunks.ca/otr/