Tool to decrypt/encrypt in Base 26. Base 26 uses 26 symbols, by using the alphabet's letter, Base 26 cipher can encrypt words with numbers and conversely.

Base 26 Cipher - dCode

Tag(s) : Cryptography, Arithmetics

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The encoding with **hexavigesimal** (**base 26** name) uses an arithmetic base change from **base 26** to base 10. The words are considered as written in **base 26** (with 26 symbols: the 26 letters of the alphabet `ABCDEFGHIJKLMNOPQRSTUVWXYZ`) and converted to base 10.

__Example:__ To code `DCODE`, written in **base 26**, convert it to base 10: `D=3`, `C=2`, `O=14`, `D=3`, `E=4` so $ 3 \times 26^4 + 2 \times 26^3 + 14 \times 26^2 + 3 \times 26^1 + 4 \times 26^0 = 1415626 $

This method is the most rigorous mathematically, but can raise problems for encrypting words starting with `A` (which corresponds to the `0` symbol in base 10) and is thus generally ignored at the beginning of the number (`001 = 1`). It is sometimes considered to use 'A = 1' for some applications in cryptography.

**Hexavigesimal** (**base26**) decryption consists of the conversion from the base 10 to the **base 26** (using the words as **hexavigesimal** numbers with the 26 letters of the alphabet as base symbols).

__Example:__ $ 1415626 = 3 \times 26^4 + 2 \times 26^3 + 14 \times 26^2 + 3 \times 26^1 + 4 \times 26^0 $ so `[3,2,14,3,4]` in **base 26** and `3=D`, `2=C`, `14=O`, `3=D`, `4=E`. The plain message is `DCODE`.

The ciphered message is made of numbers, relatively big (for long words)

Usual words can appear multiple times with the same value in a long text.

The calculation of the modulo 26 values of each word makes it possible to find the value of the last letter, which should be `E` or `S` (the most common final letters)

Rather than converting normally, the reverse order of letters can be considered (or the word reversed):

__Example:__ `DCODE` = $ 3 \times 26^0 + 2 \times 26^1 + 14 \times 26^2 + 3 \times 26^3 + 4 \times 26^4 = 1890151 $ (this is equivalent to coding `EDOCD`).

as `A` is encoded `0` in **base 26**, when encoding it is null and disappear when decoding.

__Example:__ `AB = 0*26^1+1*26^0 = 1` and `1 = B`

Add a zero at the beginning of a number to indicate a `A` at the beginning of a word.

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

base,base26,26,hexavigesimal,alphabet,number,word

Source : https://www.dcode.fr/base-26-cipher

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