ciphers

A set of ciphers

xor

void  xor_encrypt_decrypt(void *key, size_t key_length, void *data, size_t data_length)
                              <rdi>           <rsi>        <rdx>            <rcx>

An XOR cipher in assembly language.
In cryptography, the simple XOR cipher is a type of additive cipher, an encryption algorithm that operates, in binary, according to the principles:

   0 1 1
   0 1 0
   _____
=> 0 0 1

Encryption and decryption is done by the same algorithm.

xor_with_addition

void	xor_with_additive_cipher(
	void *key, size_t key_length, void *data, size_t data_length)
         <rdi>           <rsi>         <rdx>           <rcx>

We added an additive cipher to the previous XOR cipher:

- encyption:
	1. <byte> + <additive cipher value>
	2. XOR <data-byte> <key-byte>

- decryption:
	1. XOR <data-byte> <key-byte>
	2. <byte> - <additive cipher value>

nbralpha

Description

A numbered alphabet cipher in python.

• During encryption, it takes command-line arguments, convert each argument to a series of numbers representing the position of each character in the alphabet, and prints the results.
• The reverse process is done during decryption.
  

It can only decode numbers separated by spaces. * Handled alphabetical characters include ranges: a-z, Ç-Ü, á-Ñ. * Handles punctuations.

Commands

// Usage
python3 nbralpha [option] [source],...

// option
-s: spaces between numbers in encryption mode's output string.
-v: verbose mode. Useful to desactivate when reusing the
output through pipes, etc.

Screenshot

From Edgar Allan Poe's short story "The Gold-Bug."