2023-11-11 14:00:00 +09:002023-11-12 14:00:00 +09:00

CTF will start in

[ About ]

Welcome to CakeCTF 2023! CakeCTF 2023 is a Jeopardy-style Capture The Flag competition hosted by yoshiking, theoremoon, and ptr-yudai. There will be challenges in categories such as pwn, web, rev, crypto, etc. The challenges are of a difficulty level targeting beginner to intermediate players.
This year we have reduced the difficulty level and the number of challenges a little more than in previous years. Advanced players are encouraged to participate solo or in teams with a couple of people.

[ Task Release Schedule ]

We will announce the schedule of the challenge release in Discord.

  • 1st wave: 2023-11-11 14:00:00 JST (UTC+9)
  • 2nd wave: 2023-11-11 16:00:00 JST (UTC+9)
  • Survey: 2023-11-12 02:00:00 JST (UTC+9)

[ Prize ]

Small gifts will be awarded to teams that rank in the top 5 who can receive prizes in Japan (by selecting Japan as their team country to be eligible).

We cannot send the prize abroad. Please understand at least one of your team members needs to reside in Japan to be eligible, as mentioned above.



[ Sponsors ]

We'd like to thank the following people for their financial support in organizing this event!

  • so
  • Edwow Math
  • 寿司はうまい
  • yu1hpa
  • udon
  • jt
  • Xryus Technologies
  • 沖絢斗
  • kusano_k
  • kurenaif

Also, the infrastructure of this CTF is sponsored by Google CTF Sponsorship. Thank you!

[ Contact ]


[ Rules ]

  • There is no limit on your team size.
  • Anyone can participate in this CTF: No restriction on your age, nationality, or the editor you use.
  • Your position on the scoreboard is decided by:
    1. The total points (Higher is better)
    2. The timestamp of your last submission (Earlier is better)
  • The survey challenge is special: It gives you some points but it doesn't update your "submission timestamp". You can't get ahead simply by solving the survey faster. Take enough time to fill the survey.
  • You can't brute-force the flag. If you submit 5 incorrect flags in a short period of time, the submission form will be locked for 5 minutes.
  • You can't participate in multiple teams.
  • Sharing the solutions, hints or flags with other teams during the competition is strictly forbidden.
  • You are not allowed to attack the scoreserver.
  • You are not allowed to attack the other teams.
  • You are not allowed to have multiple accounts. If you can't log in to your account, use the password reset form or contact us on Discord.
  • We may ban and disqualify any teams that break any of these rules.
  • The flag format is CakeCTF\{[\x20-\x7e]+\} unless specified otherwise.
  • You can ask us in Discord if you have any questions.We can't give you hints of the challenges, however.
  • Most importantly: good luck and have fun!
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