Proving you've done your work.
Just your basic byte reading. A good warm-up excercise.
Generate an SSL certificate according to given data.
A short trip that ought to clear up some misconceptions.
Hunt for faces in a bunch of tiles.
Extract some data from Redis. In a way.
Basic arithmetic and – quite literally – reading numbers.
Send a few requests from a few different places.
Talk to a WebSocket server until it reveals a password.
A rather short fling with colliding MD5.
Set up a DNS server according to a specification.
Restore a database dump and extract some data.