Sep 06, 2018 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.
Basic but pure DES implementation in PythonI have written it for fun because nothing else.
How it works ?
- Apr 22, 2019 pydes. Basic but pure DES implementation in Python I have written it for fun because nothing else. 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.
- Data encryption standard (DES) has been found vulnerable against very powerful attacks and therefore, the popularity of DES has been found slightly on decline. DES is a block cipher, and encrypts data in blocks of size of 64 bit each, means 64 bits of plain text goes as the input to DES, which produces 64 bits of cipher text.
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.
How to use it ?
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.
To use padding:
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Des Key Generation Code In Python
| Discusses symmetric encryption key generation techniques for block encryption algorithms such as AES, Blowfish, and Twofish, or for other algorithms such as ChaCha20.
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