Hi Paul

Would a downgrade attack be possible if the PPK notify is included in the 
authentication material ?

cheers

On 03/04/2017, 18:21, "IPsec on behalf of Paul Wouters" <ipsec-boun...@ietf.org 
on behalf of p...@nohats.ca> wrote:

    I would think this is the obvious solution. I would not want to run a
    connection definition that you can connect to "with or without PPK" and
    run the risk of downgrade attack until the very last host has upgraded
    to support PPK.
    
    Paul

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