Which of the following is true about an email that was signed by User A and sent to User B?

The correct answer is B. User A signed with their own private key and User B verified with User A's public key. Digital signatures provide authentication and non-repudiation. The process works as follows: the sender (User A) creates a digital signature using their own private key. The recipient (User B) verifies the signature using User A's public key. If the signature is valid, it…

General security concepts

Question

Options

AUser A signed with User B's private key and User B verified with their own public key.
BUser A signed with their own private key and User B verified with User A's public key.
CUser A signed with User B's public key and User B verified with their own private key.
DUser A signed with their own public key and User B verified with User A's private key.

How the community answered

(23 responses)

A
4% (1)
B
96% (22)

Explanation

Digital signatures provide authentication and non-repudiation. The process works as follows: the sender (User A) creates a digital signature using their own private key. The recipient (User B) verifies the signature using User A's public key. If the signature is valid, it proves the message came from User A (only User A holds their private key) and has not been tampered with. The other options are incorrect because private keys are never shared, and signing with someone else's public key would not prove the sender's identity.

Topics

#digital signatures#PKI#non-repudiation#public key cryptography

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