Mysterious Codes

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Across
  1. 1. Original, unencrypted message; the readable content before undergoing encoding.
  2. 3. Various arrangements or sequences; in cryptography, the potential permutations of keys and codes.
  3. 5. Encryption system using a single key for both encoding and decoding processes.
  4. 9. Protection against unauthorized access; measures to ensure confidentiality and integrity.
  5. 10. Transform into secret language; conceal message using a systematic method.
  6. 12. Reveal hidden meaning; decipher encrypted message by applying a specific process.
Down
  1. 2. Sending of information; the act of conveying encoded messages from sender to receiver.
  2. 3. Ancient cipher method; shift letters in the alphabet to encode or decode messages.
  3. 4. Personal secrecy; the state of being free from unauthorized intrusion.
  4. 6. Process of converting plaintext into ciphertext to protect information from unauthorized access.
  5. 7. Encoded or encrypted message; the result of applying a cipher to plaintext.
  6. 8. Unauthorized listener; one who covertly intercepts communication to gain information.
  7. 11. Essential element for encryption and decryption; unlocks encoded messages.