# Tag Info

4

Diffie-Hellman (and variants such as ECDH) protect against passive eavesdroppers, but not (at least by themselves) against active man-in-the-middle attacks. An active MITM can substitute his own keys for Alice and Bob's keys during the initial exchange, something like this: Alice -> Bob (intercepted by Mallory): Hi Bob, I'm Alice and here's my public key: ...

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