## PROBLEM LINK:

**Author, Tester, Editorialist:** Vaibhav Gupta

## PROBLEM

Find the final sequence of bits in hex format after passing the initial sequence through different steps (boxes) of the DES.

## QUICK EXPLANATION

Follow the step by step procedure and one by one pass the sequence of bits through the series of boxes and obtain the final result.

## EXPLANATION

- Convert the given sequence of bits in binary form and retrieve the 32 bit sequence.
- Passing through the Expansion D-box, we get a 48-bit sequence.
- Making groups of 6-bits together and passing the 8 groups through the 8 different s-boxes, we finally get the 32-bit sequence. See here for how to use S-boxes.
- Convert the sequence into hex.