What a Capture the Flag Is

A capture-the-flag competition presents security challenges inside an authorized environment. Each challenge asks a player or team to recover a secret string called a flag. Submitting the expected string to the scoreboard records a solve and awards points according to the event's rules.

The challenge description defines the intended target: perhaps a supplied file, a temporary web application, or a network service created for the event. Permission is limited to that target and the methods allowed by the rules. The scoreboard, hosting platform, other players, and unrelated systems remain outside scope.

CTF organizers usually isolate challenge data from production systems, but no online platform can promise that risk is literally zero. Follow the event's rules, avoid unnecessary traffic, and report unexpected platform defects through the stated channel rather than testing them further.