Ciphers are methods of transforming information to conceal its meaning or structure. This index organizes classical and modern ciphers alphabetically, providing direct access to explanations, history, and practical usage for each technique.

A — Monoalphabetic & Polyalphabetic Classical Ciphers
A1Z26 Cipher Affine Cipher Alberti Cipher Atbash Cipher Autokey Cipher Autokey Vigenère Cipher
B — Book & Digraph-Based Ciphers
Baconian Cipher Base64 Cipher Beale Cipher Beaufort Cipher Bifid–Bacon Hybrid Cipher Bifid Cipher Book Cipher
C — Simple Substitution Ciphers
Cadenus–Gronsfeld Cipher Caesar Cipher Chaocipher Cicada-3301 Columnar Cipher Combination Cipher
D — Transposition & Route Ciphers
D’Agapeyeff Polybius Cipher Dice Cipher Digraph Cipher Dorabella Cipher
E — Enigma Cipher
Enigma Machine
F — Fractionation Ciphers
Francis-Bacons-Substitution Cipher Foursquare Cipher
G — Grille & Mask Ciphers
Giovanni-Fontana Cipher Grid-Transposition Cipher Gronsfeld Cipher
H — Hand & Manual Field Ciphers
Hill Cipher Homophonic-Substitution Cipher
I — Index-Based Ciphers
Index Card Cipher
J — Jefferson's Cipher
Jefferson Disk Cipher
K — Keyword-Based Substitution Ciphers
Kama-Sutra Cipher Kangaroo Cipher Keyboard Code Keyed Caesar Cipher Knapsack Cipher
L — Letter-Number & Lorenz Cipher
Letter Number SubstitutionLorenz Cipher
M — Map, M-209, M-94 & Morse
Map Cipher M-209 Cipher M-94 Cipher Morse Code
N — Nihilist & Null Cipher
Nihilist Cipher Null Cipher
O — Book Cipher
Ottendorf Cipher
P — Polyalphabetic Substitution Ciphers
Patristic Cipher Pigpen Cipher Pinprick Cipher Playfair Cipher Polyalphabetic Cipher Polybius Cipher Polygraphia Porta Cipher
R — Route, Rail & Positional Ciphers
Rail-Fence Cipher Rosicrucian Cipher ROT Cipher Rout Cipher Running-Key Cipher
S — Steganographic & Concealment Methods
Scytale Cipher Semaphore Cipher Simple Substitution Cipher Solitaire Cipher Spiral Cipher Straddling Checkerboard Cipher
T — Transposition-Based Classical Ciphers
Tap Code Templar Cipher Transposition Cipher Trifid Cipher Trithemius Cipher
V — Variable-Key Polyalphabetic Ciphers
Vernam Cipher Vigenère Cipher
X — Experimental & Hybrid Cipher Systems
XOR Cipher
Z — Zigzag & Zodiac Cipher
Zigzag CipherZodiac Cipher