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      Question

      Which of the following correctly explains the difference

      between 'symmetric' and 'asymmetric' encryption?
      A Symmetric encryption uses the same key for both encryption and decryption; asymmetric encryption uses a mathematically linked key pair (public and private key) Correct Answer Incorrect Answer
      B Symmetric encryption uses one key for encryption and a different key for decryption; asymmetric uses the same key for both Correct Answer Incorrect Answer
      C Symmetric encryption is slower and stronger; asymmetric encryption is faster and weaker Correct Answer Incorrect Answer
      D Symmetric encryption is used only for data at rest; asymmetric is used only for data in transit Correct Answer Incorrect Answer
      E Symmetric encryption uses hardware; asymmetric encryption uses software only Correct Answer Incorrect Answer

      Solution

      Symmetric (AES, DES, 3DES) is fast, efficient and ideal for bulk data encryption. The challenge is secure key distribution. Asymmetric (RSA, ECC, Diffie-Hellman) is where public key encrypts/verifies; private key decrypts/signs. It solves key distribution but is computationally slow. In practice, both are combined: asymmetric encryption securely exchanges a symmetric session key, then symmetric encryption handles bulk data (TLS/SSL uses this hybrid approach for internet banking).

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