Rainbow Table - Answer A table of hash values and their corresponding plaintext values that can be
used to look up password values if an attacker is able to steal a system's encrypted password file.
HMAC - Answer a fixed length string of bits similar to other hashing algorithms such as MD5 and SHA-1,
but it also uses a secret key to add some randomness to the result.
Pigpen Cipher - Answer a geometric simple substitution cipher, which exchanges letters for symbols
which are fragments of a grid
Rail Code - Answer scrambles text by writing it across rows and columns
bifid cipher - Answer maps letters in a grid to numeric values
Playfair Cipher - Answer Uses a 5x5 table and a key word. Rest of the alphabet is placed on table in
alphabetic order, skipping letters used in the keyword. You break up the message into two character
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