SIGABA - Classic Cipher Schemes

Types of Ciphers

• Polybius Square (c. 150 BC) -- encoding
• Nicodemus (c. 17th century)
• Grandpre (c. 17th century)
• Playfair (c. 1854)
• Nihilist (c. 19th century)
• Book (c. 19th century)
• Bifid (c. 1901)
• One-Time Pad (c. 1917)
• Hill (c. 1929)
• Four Square (c. 20th century)
• Pollux (c. 20th century)
• Syllabary (c. 20th century)
• Gromark (c. 1940s)
• Morbit (c. 1940s)
• Feistel (c. 1970s)

Affine Monoalphabetic

• Atbash (c. 500 BC)
• Caesar (c. 58 BC)
• Affine (c. 1920s)
• ROT13 (c. 1980s)

Transposition

• Rotation (c. ?)
• Scytale (c. 400 BC)
• Columnar (c. 1880)
• Grille (c. 19th century)
• Rail Fence (c. 19th century)
• Myszkowski (c. 1902)
• Route (c. 20th century)

Vigenère

• Vigenère (+Variant Beaufort) (c. 1553)
• Beaufort (c. 17th century)
• Autokey (c. 1855)