Security risks and precautions

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Across
  1. 3. A person seeking to gain unauthorised access to a computer system or network.
  2. 5. A security system which monitors outgoing and incoming network traffic.
  3. 7. Text which has been encrypted.
  4. 9. cipher An old method of encryption.
  5. 10. Changing cipher text back to plain text.
  6. 11. A number or code which is used to encrypt or decrypt data.
  7. 13. A type of computer program which self-replicates and causes damage to a computer system.
Down
  1. 1. A type of computer program which disguises itself as a harmless file.
  2. 2. A term used to describe harmful software.
  3. 4. Text which has not yet been encrypted.
  4. 6. A computer program which self-replicates and spreads across a computer network.
  5. 8. A method of protecting data by changing it into a code so unauthorised users cannot read it.
  6. 12. Changing plain text to cipher text.