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

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

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

Tag(s) : Substitution Cipher

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

## Number to Letter A1Z26 Converter

 Decryption Automatic (Basic cases)  Brute-Force (w/o Separator)

## Calculate a word's value

⮞ Go to: Word's Value

### What is the A1Z26 cipher? (Definition)

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.

### 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:

 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

### 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

 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

### 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

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Letter Number Code (A1Z26) A=1, B=2, C=3 on dCode.fr [online website], retrieved on 2024-09-09, https://www.dcode.fr/letter-number-cipher

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