square-ctf - Capture the Flag competitions, hosted by Square, where teams compete to solve security-related challenges for points.
Our CTFs are meant to be fun for both, first time as well as experienced players. We create an assortment of easy, medium, and hard puzzles.
We aspire to create a few novel puzzles, putting everyone on the same level.
We have a list of tips that should help you get started. Some of our previous years' challenges and their solutions are made available to you. You are free to use the content on this site as you please — you may even flatter us by copying bits and pieces for your own event!
Our CTFs have been possible thanks to Square engineers contributing their time, skills and energy. Every year, about a dozen engineers get together to build puzzles, as well as spin up all the infrastructure needed to run a smooth competition. We hope you find these puzzles fun and educational, we definitely enjoy making them!
+ everyone who has helped us in various ways. Including making sure our puzzles are solvable, publicizing our events and helping out with last minute show stoppers.
We are also thankful to everyone who took the time to publish writeups/solutions!
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