Wireguard Pre-Shared key Purpose?

[lleachii]

@Dasha

1. How the Pre-shared key is used in Wiregaurd encryption?

If an additional layer of symmetric-key crypto is required (for, say, post-quantum resistance), WireGuard also supports an optional pre-shared key that is mixed into the public key cryptography

~ from : https://www.wireguard.com/protocol/

See also: https://en.wikipedia.org/wiki/Post-quantum_cryptography

@Dasha

2. For Wireguard key rotation, rotating the pre-shared key is best (or) rotating the Private & Public key pair is best?

~ https://crypto.stackexchange.com/questions/41796/whats-the-purpose-of-key-rotation

BTW, you cannot change a public key without changing the private, and vice versa, meaning the method of identifying your peer changes.