Microsoft MTA Security Fundamentals Practice Test (98-367日本語版) - 98-367日本語 Exam Practice Test

Explanation
First answer - man in the middle
Second answer - digital signature
The usual way to prevent the man-in-the-middle attack is to use a public key cryptosystem capable of providing digital signatures. For set up, the parties must know each others public keys in advance. After the shared secret has been generated, the parties send digital signatures of it to each other. The man-in-the-middle can attempt to forge these signatures, but fails because he cannot fake the signatures.

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