CakeCTF

2021-08-27 23:00:00 +00:00 – 2021-08-29 11:00:00 +00:00

CTF is over. Thanks for playing!

[ About ]

Welcome to CakeCTF 2021! CakeCTF 2021 is a Jeopardy-style Capture The Flag competition hosted by yoshiking, theoremoon, and ptr-yudai. There will be some challenges of pwn, web, rev, crypto, and so on. These challenges range in difficulty from beginner to intermediate level.

[ Task Release Schedule ]

We announce the schedule of the challenge release in Discord.

  • 1st wave: 2021-08-28 08:00:00 JST (UTC+9)
  • 2nd wave: 2021-08-28 14:00:00 JST (UTC+9)
  • 3rd wave: 2021-08-28 20:00:00 JST (UTC+9)

[ Prize ]

The following teams can get some small gifts this year.

  • Top 3 prize-eligible teams on the scoreboard (Swag × 4)
  • Prize-eligible teams that got first-blood on some specific challenges (Swag × 1)
4 challenges from each main category (crypto, pwn, web, rev) will be subject to the first-blood prize. We'll announce which challenges you can get the first-blood prize in Discord before the CTF starts.
As we cannot send the prize abroad, at least one of your team members needs to live in Japan to be eligible.

今年はささやかな賞品を用意しています。以下のチームが対象です。

  • (賞品を受け取れる)上位3チーム (Prizeセット × 4)
  • 特定の問題を最初に解いた(賞品を受け取れる)チーム (First-Blood Prizeセット × 1)
メインカテゴリ（crypto, pwn, web, rev）の4つの問題がFirst-Blood Prizeの対象になります。 どの問題がFirst-Blood Prizeの対象かは、CTFが始まる前にDiscord上で連絡します。
海外への賞品発送には対応していないので、賞品を受け取るにはチームメンバーの少なくとも1人が日本に居住している必要があります。

[ Sponsors ]

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

  • 3socha
  • kusano_k
  • rkm0959
  • prof_siba
  • 匿名希望

[ Contact ]

Discord: https://discord.gg/mKbt7vje

[ 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.
  • Most importantly: good luck and have fun!