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Letter Number 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.

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Letter Number A=1, B=2, C=3 -

Tag(s) : Cryptography, Substitution Cipher

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Letter Number A=1, B=2, C=3

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Number to Letter Converter






Letter to Number Encoder









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.

Answers to Questions

How to encrypt using Letter-to-Number cipher?

A1Z26 decryption requires only to know the alphabet (usually the latin alphabet with 26 characters) and to count ranks of each letter.

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

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.

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

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.

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