potential preshared-key changes
stromberg at mullvad.net
Sun Apr 23 13:13:21 CEST 2017
On Sun, Apr 23, 2017 at 9:05 AM, <crasm at wireguard.1.email.vczf.io> wrote:
> Forgive me in advance if this is a horrible or misinformed idea, but why
> not blake2s the preshared-key with each peer's public key and distribute
> that as a per-peer "preshared" key, mixing it in last? That would reduce
> the risk of key compromise, since each peer would have a unique key and
> the real key is not copied to each peer.
If I understand you correctly you're suggesting:
1. Peer PSK = BLAKE2S( "Real PSK" + "Peer's static pubkey" )
2. Mix in the peer's PSK the same way Jason suggests
In practice this is equivalent to the discussed change, and "Peer PSK"
would be the real key, for that peer.
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