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
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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:
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
Example: 18.104.22.168.22.214.171.124 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 modulo 26 in order to get 1=A,2=B,...26=Z then 27=A, 28=B etc.