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

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.

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

Tag(s) : Substitution Cipher

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

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Number to Letter A1Z26 Converter






Letter to Number A1Z26 Encoder









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Answers to Questions (FAQ)

How to encrypt using Letter-to-Number/A1Z26 cipher?

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:

ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567891011121314151617181920212223242526

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

How to decrypt Number-to-Letter cipher?

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

ABCDEFGHIJKLMNOPQRSTUVWXYZ
1234567891011121314151617181920212223242526

Example: 1.12.16.8.1.2.5.20 gives ALPHABET

How to recognize Letter-to-Number ciphertext?

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.

What are the variants of the Letter-to-Number cipher?

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.

Source code

dCode retains ownership of the online 'Letter Number (A1Z26) A=1, B=2, C=3' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'Letter Number (A1Z26) A=1, B=2, C=3' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Letter Number (A1Z26) A=1, B=2, C=3' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'Letter Number (A1Z26) A=1, B=2, C=3' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

Need Help ?

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Questions / Comments

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!


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