Python module and its web equivalent, to hide text within text by manipulating bits

Overview

cacherdutexte.github.io

This project contains :

  • Python modules (binary and decimal system 6) with a dedicated tkinter program to use it.
  • A web version, which is actually hosted on https://cacherdutexte.github.io.

I explain below how the project works, but an english version is available. See directly the English explanation 🇬🇧

🇫🇷 Comment j'ai caché du texte dans du texte

C'est une façon en manipulant les bits de cacher du texte dans du texte. Imaginons la chaine de caractère :

Hacker

Que je veux cacher dans le message :

Bonjour, je suis Axel Thauvin
  • Dans un premier temps, on vient récupérer la représentation décimale dans la table UTF-8 de chaque caractère de la chaine Hacker

    Voici dans un tableau, la représentation décimale des 127 premiers caractères (aussi appelé tableau ASCII) :

Pour l'exemple, nous allons prendre le caractère H. Ici, sa représentation décimale est 72 (base 10).

  • Ensuite nous allons convertir ce nombre en base 6 sur 4 'bits'

    Pourquoi ?

    Si nous codons les lettres en base 6 sur 4 bits, nous aurons la représentation maximale de 5555 -> soit 64 -> 1296 : la valeur maximale que nous allons pouvoir exploiter dans ce tableau

    En fait nous avons 5 caractères invisibles qui vont correspondrent aux chiffres de ces bits, que nous allons cacher dans notre texte.

    • Pour le 0 il n'y a pas de caractère caché
    • Pour le 1 c'est le caractère unicode \u200C
    • Pour le 2 c'est le caractère unicode \u200D
    • Pour le 3 c'est le caractère unicode \u200E
    • Pour le 4 c'est le caractère unicode \u200F
    • Pour le 5 c'est le caractère unicode \u034F

    Exemple avec le H

    Ici la représentation décimale de H est 72. Sa représentation en base 6 sur 4 bits est 0200.

    Je vais donc :

    • Pas ajouter de caractère pour le 1er bit (car il vaut 0)
    • Ajouter le caractère \u200D pour le 2ème bit (car il vaut 2)
    • Pas ajouter de caractère pour le 3ème bit (car il vaut 0)
    • Pas ajouter de caractère pour le 4ème bit (car il vaut 0)

    Reprenons la chaine initiale J'ai Bonjour, je suis Axel Thauvin. Je vais donc écrire : Bo\u200Dnj juste pour le H

    Et je fais pareil avec tous les caractères de Hacker. Ce qui me donne : Bo‍njou‍r‏,‌ j‍e‏ ‎su‍i͏s͏ A‍x‏e͏l ‎T‌hauvin (généré avec mon programme, vous pouvez l'essayer sur mon site)

    Voilà le résultat :

🇬🇧 How did I hid text in text

This is a bitwise way of hiding text within text. Let's imagine the string :

Hacker

That I want to hide in the message:

Hello, I am Axel Thauvin
  • First, we get the decimal representation in the UTF-8 table of each character in the Hacker string

    Here is the decimal representation of the first 127 characters in an array (also called ASCII array):

For the example, we will take the character H. Here, its decimal representation is 72 (base 10).

  • Then we will convert this number to base 6 on 4 'bits'

    Why ?

    If we encode the letters in base 6 on 4 bits, we will have the maximum representation of 5555 -> that is 64 -> 1296 : which is the maximum value we can use in this table

    In fact we have 5 invisible characters which will correspond to the digits of these bits, which we will hide in our text.

    • For the 0 there is no hidden character*.
    • For 1 it is the unicode character \u200C*
    • For 2 it is the unicode character \u200D*
    • For 3 it is the unicode character \u200E
    • For 4 it is the unicode character \u200F
    • For 5 it is the unicode character \u034F

    Example with H

    Here the decimal representation of H is 72. Its 4-bit base-6 representation is 0200.

    I will therefore :

    • Not add a character for the 1st bit (because it is 0)
    • Add the character \u200D for the 2nd bit (because it is 2)
    • Not add a character for the 3rd bit (because it is 0)
    • Do not add a character for the 4th bit (because it is 0)

    Let's go back to the original string. I have Hello, I am Axel Thauvin. So I'll write : I'll write He\u200Dll just for the H

    And I do the same with all the characters in Hacker. Which gives me: He‍‍llo‍,‏‍‌ ‏‍I‏‌‎ a‍‍͏m͏‏ ‍‎‏A͏x‍‎e‌͏l͏ T‍h‏a͏uv‎i‌n (generated with my program, you can try it on my website)

    Here is the result:

Owner
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