1									17
		15			2
14
		3													18
														4
5
													6
							16
											7
	8
				9
10
			11
	12/13

Across

1. "A polyalphabetic cipher similar to the Vigenere Cipher, but using the plaintext itself as part of the key sequence in order to overcome a weakness observed in the original Vigenere Cipher."

2. An attack on a cipher by trying every possible key until the correct one is found.

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

4. The encrypted form of a plaintext message

5. Circular or ring-shaped distortions that occur around edges in compressed images

6. A number system that uses base-2 numerals (0 and 1) to represent numbers.

7. A precomputed table used in password cracking to reverse cryptographic hash functions and quickly determine the original password.

8. An operator that operates on logical values, such as true and false.

9. An operator that returns true if exactly one operand is true.

10. The total number of possible keys that can be used by a cipher

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

12. A method of data representation that uses two digits, namely 0 and 1.

13. The numeric representation of data in binary form.

Down

14. A type of substitution cipher in which each letter in the plaintext is shifted a certain number of places down the alphabet.

15. The range of frequencies a microphone can accurately capture and reproduce.

16. A mathematical operator used to perform division with remainder, often denoted by the percent symbol (%).

17. A group of letters added at the beginning of a word to change its meaning.

18. A number representation system using only two digits, 0 and 1.

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