Tool to convert letters to numbers and vice versa using the alphanumeric code A1Z26 (A=1, B=2, C=3).

Letter Number Code (A1Z26) A=1, B=2, C=3 - dCode

Tag(s) : Substitution Cipher

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The Letter-to-Number Cipher (or *Number-to-Letter Cipher* or *numbered alphabet*) consists in replacing each letter by its position in the alphabet, for example A=1, B=2, Z=26, hence its over name A1Z26.

A1Z26 encryption requires to count the positions/ranks of letters in the alphabet. If it is the Latin alphabet of 26 characters here is the correspondence table letter ↔ number/value:

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |

Replace each letter with its position in the alphabet (A = 1, B = 2, … Z = 26)

__Example:__ `DCODE` is encrypted `4-3-15-4-5` by alphanumeric substitution

Often the space character is also encoded with the number `0`

Decryption requires taking each number and replace it with the letter of same position in the alphabet: 1 = A, 2 = B, … 26 = Z

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |

1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |

__Example:__ `1.12.16.8.1.2.5.20` gives `ALPHABET`

The crypted message is made of numbers between 1 and 26, sometimes the number 0 is used to code a space.

The digit `5` for `E` is supposed to appear regularly for an English text.

This encryption is sometimes called *alphanumeric code*.

Shift of numbers: the alphabet can start with A = 0 or A = 1, but also A = 65 or A = 97 (ASCII code).

Use of a supplementary character for space (usually 0 or 27)

Use of leading zeros to be able to concatenate numbers `AB` = `0102`, else `AB` = `12` and `12` = `L`.

Use of a custom alphabet, or reversed alphabet (A=26, Z=1)

Use of modulo 26 in order to get 1=A,2=B,…26=Z then 27=A, 28=B etc.

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Cite as source (bibliography):

*Letter Number Code (A1Z26) A=1, B=2, C=3* on dCode.fr [online website], retrieved on 2024-06-18,

- Number to Letter A1Z26 Converter
- Letter to Number A1Z26 Encoder
- Calculate a word's value
- What is the A1Z26 cipher? (Definition)
- How to encrypt using Letter-to-Number/A1Z26 cipher?
- How to decrypt Number-to-Letter cipher?
- How to recognize Letter-to-Number ciphertext?
- What are the variants of the Letter-to-Number cipher?

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