Company A sends a PGP encrypted file to company B. If company A used company B's public key to encrypt the file, which of the following should be used to decrypt data at company B?

The correct answer is D. Private key. This is a fundamental rule of asymmetric (public-key) cryptography: data encrypted with a recipient's public key can only be decrypted with that recipient's corresponding private key. Company A encrypted the file using Company B's public key (which is freely shared), so only…

General security concepts

Question

Options

ARegistration
BPublic key
CCRLs
DPrivate key

How the community answered

(32 responses)

B
6% (2)
C
3% (1)
D
91% (29)

Explanation

This is a fundamental rule of asymmetric (public-key) cryptography: data encrypted with a recipient's public key can only be decrypted with that recipient's corresponding private key. Company A encrypted the file using Company B's public key (which is freely shared), so only Company B's private key (which is kept secret) can reverse the encryption. Using the public key to decrypt is mathematically impossible in asymmetric cryptography. Registration and CRLs (Certificate Revocation Lists) are PKI management concepts unrelated to the decryption operation itself.

Topics

#PGP#asymmetric encryption#public key cryptography#key pairs

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