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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Base 26 (hexavigesimal) is the arithmetic base using 26 digits/symbols/characters to write numbers. This base can be used with the 26 letters of the alphabet as *digits*, which makes it possible to numerically encode any word (in both directions: numbers to letters or letters to numbers).

The encoding with base 26 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.

The lookup table is:

0 | A | 1 | B | 2 | C | 3 | D | 4 | E | 5 | F | 6 | G | 7 | H | 8 | I |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

9 | J | 10 | K | 11 | L | 12 | M | 13 | N | 14 | O | 15 | P | 16 | Q | 17 | R |

18 | S | 19 | T | 20 | U | 21 | V | 22 | W | 23 | X | 24 | Y | 25 | Z |

__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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Cite as source (bibliography):

*Base 26 Cipher* on dCode.fr [online website], retrieved on 2023-10-01,

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

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

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