Joe, a user, wants to send an encrypted email to Ann. Which of the following will Ann need to use to verify that the email came from Joe and decrypt it? (Select TWO).

The correct answer is D. Ann's private key F. Joe's public key. This question covers two separate operations in PKI-based email security. First, to DECRYPT the email: Joe encrypts the message using Ann's public key (so only Ann can read it). Ann must use her own private key (D) to decrypt it - this is asymmetric encryption at work. Second, to

General security concepts

Question

Options

AThe CA's public key
BAnn's public key
CJoe's private key
DAnn's private key
EThe CA's private key
FJoe's public key

How the community answered

(22 responses)

A
9% (2)
B
14% (3)
C
5% (1)
D
73% (16)

Explanation

This question covers two separate operations in PKI-based email security. First, to DECRYPT the email: Joe encrypts the message using Ann's public key (so only Ann can read it). Ann must use her own private key (D) to decrypt it - this is asymmetric encryption at work. Second, to VERIFY the email came from Joe (digital signature): Joe signs the email with his own private key. Ann verifies that signature using Joe's public key (F) - if the signature validates, it proves the message originated from Joe and was not tampered with. Ann's public key (B) and the CA keys (A, E) are not needed for these two specific operations.

Topics

#PKI#asymmetric encryption#digital signatures#email encryption

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