Computer Networking › Section H · Security in computer networks › Topic H.4
End-point authentication
Over a network, Bob never sees Alice; he sees only bits that claim to come from her. Designing a protocol that proves who is at the other end, even when Trudy can record and replay everything, takes several attempts, and each failure teaches something.
In this topic
- Proving who you are with messages alone
- Attempts 1 and 2: a name, then an address
- Attempt 3: a secret password
- Attempt 4: an encrypted password, and replay
- Nonces and challenge-response
- Worked example: a challenge-response login
- Using public keys, and the man in the middle
- Worked example: where the protocol went wrong
- Authentication in practice
- Common mistakes to avoid
- Key takeaways
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