This is a DES algorithm implementation from scratch. The DES algorithm is a symmetric-key algorithm for the encryption of electronic data. Although its short key length of 56 bits makes it too insecure for applications, it has been highly influential in the advancement of cryptography.

python des.py

or

python3 des.py

or

using DES.ipynb in Jupyter Notebook or Google Colab

https://www.geeksforgeeks.org/data-encryption-standard-des-set-1/