200-201 Security Concepts Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  Asymmetric encryption is used only for hashing

  Why it's wrong here

  Hashing is a separate one-way operation, not a category of asymmetric encryption, which encrypts and decrypts with a public-private key pair. It is tempting because both appear in certificate and signature workflows, but the primary distinction remains key structure and distribution between symmetric and asymmetric ciphers.

• ✗

  Symmetric uses two keys, asymmetric uses one

  Why it's wrong here

  The key counts are reversed: symmetric encryption uses one shared key, while asymmetric uses a mathematically related public and private key pair. It is tempting because both involve keys, but the actual axis of difference is key distribution, since symmetric requires secure sharing of the single secret key.

• ✗

  Symmetric is slower than asymmetric

  Why it's wrong here

  Symmetric algorithms are faster than asymmetric ones, so the comparison is inverted. It is tempting because speed is a genuine practical difference, but the primary distinction concerns key structure: one shared secret key versus a public-private key pair, which determines how keys are distributed and exchanged.

• ✓

  Symmetric uses a single shared key; asymmetric uses a key pair

  Why this is correct

  Symmetric encryption relies on one shared secret key for both encryption and decryption, whereas asymmetric encryption uses a mathematically linked key pair: a public key to encrypt and a private key to decrypt. This directly satisfies the stem's request for the primary distinction between the two encryption schemes.