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Bucket brigade attack
In intruder X can cause problems
- A sends gKA mod p to B, but it is intercepted by X who sends gKX mod p to B.
- B sends gKB mod p to A, but it is intercepted by X who sends gKX mod p to A.
- X now shares a secret key with both A and B who are unaware of X
- X now intercepts messages between A and B before passing them on (or not, or modifying them...)