Cryptography and Network Security

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Across
  1. 5. Malware that locks files and demands payment
  2. 7. Original readable message before encryption
  3. 9. Security system that monitors and controls network traffic
  4. 12. Process of verifying the identity of a user or system
  5. 13. Used to verify authenticity and integrity of a message
  6. 15. Process of converting ciphertext back into readable form
Down
  1. 1. Replacing plaintext letters or symbols with other characters
  2. 2. Software designed to harm or exploit computer systems
  3. 3. Self-replicating malware that spreads across networks
  4. 4. Algorithm used to encrypt or decrypt information
  5. 6. Public key cryptosystem based on the discrete logarithm problem
  6. 8. Malware that spreads by attaching to files or programs
  7. 10. Symmetric block cipher standard used for secure encryption
  8. 11. Secret value used in encryption and decryption
  9. 14. Malicious program disguised as legitimate software