In symmetric encryption:

  1. The same key is used to encrypt and decrypt
  2. Data can never be decrypted
  3. A public key encrypts and a private key decrypts
  4. No key is needed
Answer

A) The same key is used to encrypt and decrypt

Symmetric (e.g. AES) uses one shared key — fast, good for large data, but the key must be shared securely. Asymmetric (e.g. RSA) uses a public/private key pair. SLO CS-11-A-04 · Understanding

Computer Science MCQ · More Unit 1: Computer Systems MCQs · Practise