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Code License: AGPL v3 Non-Code License: CC BY-NC-SA 4.0 Stars

This repository contains official source code and writeups for challenges from SekaiCTF 2023.

Website • Discord • Blog • Twitter • SekaiCTF 2022


Cryptography

Name Author Difficulty Solves
cryptoGRAPHy 1 sahuang Easy (1) 76
cryptoGRAPHy 2 sahuang Normal (2) 55
Noisy CRC Utaha Hard (3) 49
cryptoGRAPHy 3 sahuang Expert (4) 31
Diffecientwo deut-erium Expert (4) 13
Noisier CRC Utaha Expert (4) 8
RandSubWare deut-erium Master (5) 6

Forensics

Name Author Difficulty Solves
Eval Me Guesslemonger Easy (1) 303
DEF CON Invitation sahuang Normal (2) 148
Infected Legoclones Hard (3) 80
Dumpster Dive Guesslemonger Hard (3) 26

Miscellaneous

Name Author Difficulty Solves
I love this world pamLELcu Easy (1) 166
QR God Guesslemonger Normal (2) 13
A letter from the HRM pamLELcu Hard (3) 44
SSH hfz Hard (3) 18
[Blockchain] Re-Remix Yanhui Hard (3) 9
[Blockchain] Play for Free Yanhui Expert (4) 7
SekaiCTFCorp irogir Expert (4) 4
Just Another Pickle Jail Quasar Master (5) 5

PPC

Name Author Difficulty Solves
Wiki Game sahuang Easy (1) 284
Purple Sheep Apple Rush Lior Hard (3) 35
Mikusweeper sahuang, pamLELcu Hard (3) 50
Project Sekai Event Planner SEEM, sahuang Master (5) 2

Binary Exploitation

Name Author Difficulty Solves
Cosmic Ray Rench Easy (1) 149
Network Tools Johnathan Normal (2) 110
Text Sender Johnathan Hard (3) 31
Algorithm Multitool Zafirr Expert (4) 2
Hibana nyancat0131 Expert (4) 0
Notification Piers Expert (4) 1
[Blockchain] The Bidding Triacontakai Master (5) 7

Reverse Engineering

Name Author Difficulty Solves
Azusawa’s Gacha World enscribe Easy (1) 250
Guardians of the Kernel Iy3dMejri Normal (2) 93
Teyvat Travel Guide sahuang Hard (3) 31
Sahuang Flag Checker Iy3dMejri Expert (4) 13
Conquest of Camelot sahuang Expert (4) 10

Web

Name Author Difficulty Solves
Scanner Service irogir Easy (1) 146
Frog-WAF irogir Hard (3) 29
Chunky rik Hard (3) 16
Golf Jail Strellic Expert (4) 16
Leakless Note Strellic Master (5) 4

License

Any program and/or source code in this repository is licensed under the GNU Affero General Public License version 3:

SEKAI CTF 2023 Challenges and Solutions
Copyright (C) 2023 Project SEKAI CTF team and contributors

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.

Any non-code/program content (writeups, READMEs, descriptions) in this repository is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License (CC BY-NC-SA 4.0):

SEKAI CTF 2023 Challenges and Solutions by Project SEKAI CTF team and contributors is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.