Note that we also provide write-ups and files for CTFs in 2013 [0], 2014 [1] and this year [2]. If you don't know what CTFs are: <a href="https://ctftime.org/ctf-wtf/" rel="nofollow">https://ctftime.org/ctf-wtf/</a><p>[0]: <a href="https://github.com/ctfs/write-ups-2013" rel="nofollow">https://github.com/ctfs/write-ups-2013</a><p>[1]: <a href="https://github.com/ctfs/write-ups-2014" rel="nofollow">https://github.com/ctfs/write-ups-2014</a><p>[2]: <a href="https://github.com/ctfs/write-ups-2016" rel="nofollow">https://github.com/ctfs/write-ups-2016</a>