IPSec (How does it work?). Part 1: (Authentication and Key Management)Phase 1: (Negotiate cryptographic parameters and secret keys). o Mainly consists of plain text messages. o Two parties agree on a shared DH secret and authenticate each other. o Also these parties construct IKE SA. o After Phase 1, two parties have set up an authenticated secret channel between them.-> With the shared secret, they derive three keys:1. an encryption key, 2. an authentication key,288
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