Des Key Generation Program In C++
Simplified DES (SDES) is a cryptographic algorithm developed by Edward Schaefer in 1986 with educational purposes and published in 'A simplified data encryption algorithm', Cryptologia, 20(1):77–84. Simplified DES is considered a 'toy' crypto algorithm since it uses a very short key (10-bits). Messages encrypted with SDES can be broken by brute force in a tiny. /. This is a program for Encryption and Decryption This program uses the Simple Data Encryption Standard (SDES) Algorithm. This Algo takes 8-bits of plaintext at a time and produces 8-bits of ciphertext. It uses 10-bits of key for Encryption and Decryption.
Basic but pure DES implementation in PythonI have written it for fun because nothing else.
Sample Program In C Language
How it works ?
Everything is made within a class called 'des'. This class can be instanciated once and used to cipher and decipher multiple datas.It also support padding using the PKCS5 specification. (So the data is padding even if it is multiple of 8 to be sure that the last byte il be padding data).The generation of all the keys used is made in the method generatekeys and substitute apply the SBOX permutation.The main method is run which is called by both encrypt and decrypt but in a different mode. This method do basically all the stuff, it loopthrought all the blocks and for each do the 16th rounds.
Be careful: This module implement DES in ECB mode, so you can't make it weaker. I didn't made it to be strong but for fun. Avg antivirus license key generator.
How to use it ?
Des Key Generation Program In C
I have not done any interface to take argument in command line so this module can't be used as a script. (feel free to modify it).To use it from python shell or in another module do:
Note: In this exemple no padding is specified so you have to provide a text which is multiple of 8 bytes. The key is cut to 8 bytes if longer.
Des Key Generation Program In C R
To use padding: