Ciphyor

What's it?

A Java implementation of my own encryption algorithm inspired by Vernam one

How does it work ?

Encryption

• You enter two String: a key and a message
• The message is encoded in base32 (using Guava)
• The key is hashed into a SHA-3 (515 bits) hash that we will call h1 (it's an int)
• A pseudo random number called salt is generated according to a small algorithm which confers a property: once added to h1 the result is necessarily between Integer.MIN_VALUE and Integer.MAX_VALUE (included)
• The result of salt and h1 addition is hashed into another SHA-3 (515 bits) hash that we will call h2 (it's still an int)
• A random generator is initialized with h2
• It will generate a sequence of numbers used to shift the characters of the base32 of the initial message into the alphabet.

Example : The base32 alphabet contains letters + numbers so there are 36 characters. If we want to shift the letter C of 25 (the third letter in the alphabet), we add 25 to 3 and we get 28. The twenty eighth letter of the alphabet is 1 (25 is Y, 26 is Z, 27 is 0, etc). If the result is not into the alphabet (for example 38), we substract 36 to it (so it's 2)

• We cipher the sal's base32 using a random generator initialized with h1
• A String which contains ciphered sal + ciphered message is returned

Decipherment

• You enter two String: a key and a ciphered message
• The ciphered sal is separated from the rest of the ciphered message
• To decipher the sal, the same principle is used as for encrypting but subtracting the numbers generated by the pseudo-random generator initialized with the key rather than adding them
• The seed is got using the deciphered sal and the key
• The rest of the message is deciphered using the same method but with the seed
• The message is decoded from base32 (using Guava)
• A String which contains the deciphered message is returned

Download

Here you can download the latest release: https://github.com/Th0rgal/Ciphyor/releases