ITPEC FE Morning April 2023 Question 38
ITPEC FE Morning April 2023 — Question 38 of 80
Asymmetric Encryption — how public/private key pairs work for secure communication.
In asymmetric encryption, two different keys are used:
- The sender encrypts the message using the receiver's public key
- The receiver decrypts the message using their own private key
This ensures only the intended receiver can read the message.
Why not others:
- (a) Ciphertext length has nothing to do with asymmetric vs symmetric — this describes compression, not encryption
- (c) A private key is never "open to everyone" — that contradicts the definition of a private key
- (d) Sharing a secret key describes symmetric encryption (e.g., AES), not asymmetric
Key rule: Asymmetric = encrypt with receiver's public key, decrypt with receiver's private key.
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