ITPEC IP October 2019 Question 44
ITPEC IP October 2019 — Question 44 of 100
Symmetric cryptography uses the same shared secret key for encryption and decryption. Both communicating parties must securely possess that secret, and disclosure of it compromises confidentiality in both directions.
Answer (d)
Why not others:
- knowing the symmetric encryption key enables a third party to decrypt data
- safe separate communication with multiple parties generally requires different shared keys
- digital certificates bind identities to public keys in public-key infrastructure, not to ordinary shared symmetric keys
Key rule: Symmetric encryption uses one secret key; public-key cryptography uses a mathematically related public/private key pair.
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