tl;dr: When this post is 24 hours old, CTF qualifiers will begin. Register and play at https://2015.legitbs.net/.
How to Qualify for DEF CON CTF
- Be one of the pre-qualified teams from DEF CON CTF 2014, SECCON CTF 2014, RuCTFE 2014, Ghost in the Shellcode 2015, Boston Key Party 2015, or PlaidCTF 2015.
- Place highly in this weekend's game.
Good luck!