Encryption · Question 11 of 12
Alice wants to send Bob a file. Bob should be sure that it comes from Alice, and nobody else should be able to read it. Which keys are needed?
2 answers are correct. Hard
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Answer
- B Bob's public key for encrypting
- D Alice's private key for signing
Explanation
For the signature, Alice uses her private key, and Bob verifies with Alice's public key. For confidentiality, Alice encrypts with Bob's public key; only Bob can decrypt with his private key. In practice, a symmetric session key is encrypted this way.