Codes and Ciphers

Codes and Ciphers

• Monoalphabetic
• Caesar Cipher
• Atbash Cipher
• Keyword Cipher
• Pigpen / Masonic Cipher
• Polybius Square
• Polyalphabetic
• Vigenère Cipher
• Beaufort Cipher
• Autokey Cipher
• Running Key Cipher
• Polygraphic
• Playfair Cipher
• Bifid Cipher
• Trifid Cipher
• Four-square cipher
• Transposition
• Rail Fence
• Route Cipher
• Columnar Transposition
• Miscellaneous
• Book Cipher
• Beale Cipher
• Morse Code
• Tap Code
• One-time Pad
• Scytale
• Semaphore
• ASCII Code
• Steganography
• Techniques
• Frequency Analysis
• Books

Beaufort Cipher

A Beaufort cipher uses the same alphabet table as the Vigenère Cipher, but with a different algorithm. To encrypt a plaintext message using the Vigenère Cipher, one locates the row with the first letter to be encrypted, and the column with the first letter of the keyword. The ciphertext letter is located at the intersection of the row and column. This continues for the entire length of the message.

To encode a letter with a Beaufort cipher you find the letter in the top row. Then trace down until you find the keyletter. Then trace over to the left most column to find the enciphered letter. To decipher a letter, you find the letter in the left column, trace over to the keyletter and then trace up to find the deciphered letter.

Some people find this easier to do than finding the intersection of a row and column.