DES Implementation

To know about how DES works in a nutshell, check this video :

https://www.youtube.com/watch?v=3BZRBfhpIb0

And here is a link to know how to implement DES and it helps you with some examples to check if your code works properly.

http://page.math.tu-berlin.de/~kant/teaching/hess/krypto-ws2006/des.htm

There are many lookup tables in this algorithm, don't make any mistake in initializing them. These tables are mentioned in the above link whenever they are used in between computations. But to check out all the lookup tables at once, check this Wikipedia page :

https://en.wikipedia.org/wiki/DES_supplementary_material

And the Wikipedia page for DES is informative too, it has some good diagramas to represent some computations. Check it out :

https://en.wikipedia.org/wiki/Data_Encryption_Standard#Description