Crackme
small computer program designed to test a programmer's reverse engineering skills
A crackme is a small program designed to test a programmers reverse engineering skills. It is also known by the terms reversemes and keygenmes.
They are created to have a legal way to "crack" software.
Other websites
change- crackmes.de Archived 2005-09-25 at the Wayback Machine - A great site for testing your reversing skills. Crackmes range from Very Easy to Very Hard [1-9] for many Operating systems
- phmaster.info Archived 2019-12-22 at the Wayback Machine - Polish site with a lots of task. You can find many crackme's.