A DH key exchange is an algorith that utilizes asymetic cryptographic keys.
The DH key exchange is used to establish a shared secret over an insecure medium during an IPSEC phase 1 exchange.
The DH exchange is suitable susceptible to man-in-the-middle attacks.
A DH exchange provides Perfect Forward Secrecy (PFS)
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Symmetric ciphers are faster to compute
Asymmetric ciphers use public and private keys
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