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Across

1. The practice of securing communication from unauthorized access.

2. The length of the key used in a cipher, typically measured in bits.

3. A cipher that replaces each letter in the plaintext with a different letter, symbol, or number in the ciphertext.

4. A substitution cipher in which each letter is replaced with a single, fixed symbol throughout the ciphertext.

5. A substitution cipher in which the symbol used to replace a letter varies depending on its position in the plaintext.

6. The process of analyzing encrypted information to decipher the original message or data.

7. The process of converting ciphertext back into plaintext using a cryptographic algorithm and a key.

8. The original message or data that is to be encrypted.

9. The process of converting plaintext into ciphertext using a cryptographic algorithm and a key.

10. A sequence of steps or instructions used to solve a problem or perform a task.

11. The encrypted message or data that is the result of an encryption process.

Down

12. The practice of using the same key repeatedly in a cipher.

13. A graphical representation used to represent something else, such as a letter or number in a cipher.

14. Also known as the Masonic Cipher, it is a substitution cipher used in cryptography that replaces letters with symbols and shapes.

15. The set of symbols used in a cipher to represent plaintext letters.

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