Possible App - Security

[Paul Wouters]

On Wed, 18 Jul 2007, COMINT wrote:

> I'm interested in putting together an encryption app to allow secure
> voice calls over the GSM data call facility.

You need IP layer encryption, not application based enpcryption.

So ipsec, openvpn, l2tpd, OTR, GPG.

I'd recommend using IPsec with a ppp connection if you want to do GSM data
calls - unless you want to do a "cryptophone" style DiffieHellman.

I am not sure if the latter one is patented.

Paul