Entry-level capture the flag competition

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Hacking style capture the flag competition (website may not be available year-round)

Capture the flag competition for middle and high schoolers

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Annual DEF CON capture the flag competition

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Annual capture the flag competition

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Annual tournament involving coding and security challenges

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Annual capture the flag competition with security challenges and puzzles

Capture the flag competition at DEF CON​

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Conference with capture the flag competitions

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Web application hacking challenge

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