Re: dh key exchange via ascii email?

2013-03-23 Thread Peter Lebbing
On 23/03/13 04:16, Ileana wrote: 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? I find it a really funny idea, in a positive way. Hey, I've never thought about it that way!.

Re: dh key exchange via ascii email?

2013-03-23 Thread Ileana
Peter, The basic idea is: 1. Assume 2 parties both have each others public keys and the keys are trusted/verified. 2. Bob sends alice a email message (signed/encrypted w PGP, though uncessesary) with a suggested g, and g^b. 3. Alice receives and decrypts, and if she accepts, she sends bob g^a.

Re: dh key exchange via ascii email?

2013-03-23 Thread Peter Lebbing
I hadn't quite picked up on the forward secrecy bit in your original mail. On 23/03/13 20:14, Ileana wrote: However possibly less annoying the generating new PGP keys and sending those back and forth (with over head of having to sign each new key Using subkeys, you can skip the signing. Just

Re: dh key exchange via ascii email?

2013-03-23 Thread 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

Re: dh key exchange via ascii email?

2013-03-23 Thread Ileana
I hadn't quite picked up on the forward secrecy bit in your original mail. Using subkeys, you can skip the signing. Just create throwaway encryption subkeys but don't change the primary key that receives the certifications. OK, I kind of thought of that, and I the usability overhead

dh key exchange via ascii email?

2013-03-22 Thread Ileana
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