Tool to convert letters to numbers and vice versa. The Letter-to-Number Cipher (or Number-to-Letter Cipher) consists in replacing each letter by its position in the alphabet, for example A=1, B=2, Z=26, hence its over name A1Z26.

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

Tag(s) : Substitution Cipher

dCode is free and its tools are a valuable help in games, maths, geocaching, puzzles and problems to solve every day!

A suggestion ? a feedback ? a bug ? an idea ? *Write to dCode*!

⮞ Go to: Word's Value

**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.

dCode retains ownership of the online "Letter Number (A1Z26) A=1, B=2, C=3" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "Letter Number (A1Z26) A=1, B=2, C=3" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "Letter Number (A1Z26) A=1, B=2, C=3" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "Letter Number (A1Z26) A=1, B=2, C=3" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.

Please, check our dCode Discord community for help requests!

NB: for encrypted messages, test our automatic cipher identifier!

position,rank,alphabet,number,26,letter,substitution,alphanumeric,a1,z26,a1z26,bach

Source : https://www.dcode.fr/letter-number-cipher

© 2021 dCode — The ultimate 'toolkit' to solve every games / riddles / geocaching / CTF.

Feedback

▲
Thanks to your feedback and relevant comments, dCode has developed the best 'Letter Number (A1Z26) A=1, B=2, C=3' tool, so feel free to write! Thank you!