Cipher methods Signals

Braille

Each letter is a pattern of 6 raised dots in a 2×3 grid. The universal tactile alphabet for accessibility — and a perfectly usable cipher by eye too.

Family :: Signals
Difficulty :: Beginner
Era :: 1825, Louis Braille, Royal Institute for Blind Youth (Paris)
Inventor :: Louis Braille

Also known as : Braille alphabet · tactile writing · raised-dot code

Braille is the tactile alphabet designed by Louis Braille in 1825, while he was a student at the Royal Institute for Blind Youth in Paris. He adapted a military dot-based writing system (Barbier’s night writing) for blind users, shrinking it to a 2-column by 3-row matrix small enough to be read under a single fingertip. Two centuries later, it remains the universal standard for writing for blind readers — and happens to work beautifully as a visual cipher for anyone who knows the table.

Principle

Each character lives in a cell of six numbered positions:

  1 • • 4
  2 • • 5
  3 • • 6

A raised dot counts as 1, a flat dot counts as 0. Each cell encodes 2⁶ = 64 possible combinations, more than enough for 26 Latin letters, 10 digits, punctuation and control signals (capital marker, number marker, accents).

The first 10 letters

A = ⠁ (1)          F = ⠋ (1,2,4)
B = ⠃ (1,2)        G = ⠛ (1,2,4,5)
C = ⠉ (1,4)        H = ⠓ (1,2,5)
D = ⠙ (1,4,5)      I = ⠊ (2,4)
E = ⠑ (1,5)        J = ⠚ (2,4,5)

Letters K–T are derived from A–J by adding dot 3; letters U–Z add dot 6 to K–O (Y is a historical exception).

Extensions

Number sign ⠼ — the next cell is read as a digit (A=1, B=2, …, J=0).
Capital sign ⠨ — the next letter is uppercase.
8-dot Braille (GS8) — modern computer extension to 8 positions (256 combinations).

Why it isn’t really a cipher

Braille is an accessibility script, not a secrecy tool. Its table is public, universal and taught in every school for blind students. It shows up in cryptography lists because it’s unreadable without knowing the convention — exactly like a foreign alphabet.

In a playful context, you can use it to:

Design a puzzle whose solution reads by touch (embossed board).
Build a “two-system” challenge where Braille layers onto another cipher.
Introduce the concept of fixed-length binary coding (6 bits per cell).

History and influence

1821 — Charles Barbier presents his 12-dot military night writing to the Paris Institute.
1825 — Louis Braille, aged 16, trims it to 6 dots and optimises it for touch.
1854 — France officially recognises Braille.
1949 — UNESCO launches a worldwide Braille unification programme.
2009 — global Google Doodle for the bicentenary of Louis Braille.

Braille conceptually inspired Bacon (2 symbols × 5 bits) with its combinatorial logic, and by extension the entire binary strand of modern cryptography.