The S-Box and P-Box in Block Cipher Cryptography

In this video we discuss the concepts of an S-Box and P-Box in cryptography. They are fundamental components in constructing block ciphers. The code for the P-Box has a bug in it since it does not pad with zeros. The code for the P-Box in this video is good for intuition but it is not the best approach. Please see my newer video on "The P-Box in Cryptography" for a proper way to code a general P-Box. https://youtu.be/EWJtrz6V-e4