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
B — Book & Digraph-Based Ciphers
Beale Cipher Beaufort Cipher Bifid Cipher Book Cipher
C — Simple Substitution Ciphers
Caesar Cipher Chaocipher Cicada-3301 Columnar Cipher Combination Cipher
D — Transposition & Route Ciphers
Dice Cipher Digraph Cipher Dorabella Cipher
E — Encryption & Mechanical Systems
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
K — Keyword-Based Substitution Ciphers
Keyboard Code
M — Matrix & Grid-Based Ciphers
Map Cipher
N — Numeric & Code-Based Systems
Null Cipher
P — Polyalphabetic Substitution Ciphers
Pigpen Cipher Pinprick Cipher Playfair Cipher Polyalphabetic Cipher Polybius Cipher Polygraphia
R — Route, Rail & Positional Ciphers
Rail-Fence Cipher Rosicrucian Cipher ROT Cipher Rout Cipher Running-Key Cipher
S — Steganographic & Concealment Methods
Scytale Cipher Simple Substitution Cipher Solitaire Cipher Spiral Cipher
T — Transposition-Based Classical Ciphers
Templar Cipher Transposition Cipher Trifid Cipher
V — Variable-Key Polyalphabetic Ciphers
Vernam Cipher Vigenère Cipher
X — Experimental & Hybrid Cipher Systems
XOR Cipher