The NSA issued a challenge when they tweeted out a code for anyone to try to solve.

A Grand Valley State University professor cracked the code and explained how he did it.

The NSA Careers Twitter page tweeted the code below on Monday.

It didn't take long for many to crack the code. Among those cracking the code was Szymon Machajewski, a professor at Grand Valley State University.

He explains how he did it in the video below. Machajewski talks about how each language has its own frequency and shares tools you can use to crack codes.

Look below the video to see the completed code.