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I like to participate in Capture The Flag events; computer security/hacking competitions which generally consist of participants breaking, investigating, reverse engineering and doing anything they can think of to reach the end goal; the flag, which is usually a specific string of text.

hexylena (Helena)	ysje (Saskia)

For a list of upcoming events and more writeups, see CTFtime.

For a collection of links and resources for CTFs, see the galaxians-ctf/ctf-manual repo

Some permanent CTF challenges I'd recommend are:

• OverTheWire
• SmashTheStack
• WeChall (aggregates scores from various permanent CTF challenge sites)
• Comprehensive list of CTF sites from WeChall website

and another list of permanent CTFs is here: http://captf.com/practice-ctf/