BBCR4 on Crypto-wars today at 13:30

[Ben Laurie]

On 25 March 2014 03:41, Peter Fairbrother <zenadsl6186 at zen.co.uk> wrote:
> That's cool, but it isn't much use here, and the resulting key can still be
> used for encryption - we need a key which can't be used for encryption here,
> only for signatures (else it can be demanded).

a) DSA

b) If you can sign, you can encrypt
(http://en.wikipedia.org/wiki/Chaffing_and_winnowing)