[messaging] Axolotl questions

Trevor Perrin trevp at trevp.net
Mon Dec 15 13:15:18 PST 2014

On Mon, Dec 15, 2014 at 1:03 PM, Sunny Marueli <sunnym at gmail.com> wrote:
> I was thinking about something like this:
> if ratchet_flag:
>   DHRs = generateECDH()
>   RK = HASH( DH(A, DHRr) || DH(DHRs, B) || DH(DHRs, DHRr) )
>   ratchet_flag = False

The long-term keys have already been used to agree on the root key.
Why perform frequent extra DHs to re-authenticate them, instead of
just using the root key?


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