sekaictf-2025 - SekaiCTF 2的🎵官方源代码和写入

项目说明

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This repository contains official source code and writeups for challenges from [SekaiCTF 2025][CTFTime].

[CTFTime][CTFTime] •
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[Discord][Discord] •
[Blog][Blog] •
[Twitter][Twitter]

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Blockchains

<img src=" align="right" width=200>

| Name | Author | Difficulty | Solves |
| ------------------------------------------------------------------- | ------ | ----------- | -----: |
| Sekai Meme Launcher\* | snwo | 2⯁ (Normal) | 13 |
| Sekai Lending\* | snwo | 3⯁ (Hard) | 11 |
| Stray Cat\* | Quasar | 4⯁ (Expert) | 8 |
| チケットマスター (Ticket Master)\* | Y4nhu1 | 5⯁ (Master) | 3 |

Cryptography

<img src=" align="right" width=200>

| Name | Author | Difficulty | Solves |
| ---------------------------------------------------- | --------------- | ----------- | -----: |
| SSSS | Utaha | 1⯁ (Easy) | 236 |
| I Dream of Genni | Neobeo | 2⯁ (Normal) | 124 |
| Alter Ego | kanon | 3⯁ (Hard) | 7 |
| APES | Neobeo | 4⯁ (Expert) | 3 |
| Law And Order\* | deuterium | 4⯁ (Expert) | 0 |
| unfairy-ring\* | Neobeo, Sceleri | 5⯁ (Master) | 0 |
| unfairy-ring++\* | Sceleri, Neobeo | 6✦ (Append) | 0 |

Miscellaneous

<img src=" align="right" width=200>

| Name | Author | Difficulty | Solves |
| ----------------------------------------------------------- | ---------- | ----------- | -----: |
| Discrepancy | Legoclones | 2⯁ (Normal) | 104 |
| Literal Eval | Sceleri | 3⯁ (Hard) | 15 |
| Sekai Bank - Transaction | Marc | 4⯁ (Expert) | 17 |

PPC

<img src=" align="right" width=200>

| Name | Author | Difficulty | Solves |
| ------------------------------------------------------- | -------- | ----------- | -----: |
| Nokotan's Arcade | sahuang | 1⯁ (Easy) | 390 |
| Nokotan's Antler Tines | null_awe | 3⯁ (Hard) | 37 |
| Nokotan's Guidance | null_awe | 4⯁ (Expert) | 124 |

Binary Exploitation

<img src=" align="right" width=200>

| Name | Author | Difficulty | Solves |
| ---------------------------------------------- | ------------- | ----------- | -----: |
| speedpwn 2 | Zafirr | 1⯁ (Easy) | 42 |
| Learning OOP | Zafirr | 2⯁ (Normal) | 50 |
| Outdated | Legoclones | 3⯁ (Hard) | 27 |
| Umiyuri Kaikeitan | nyancat0131 | 4⯁ (Expert) | 5 |
| vkfs | Segal, Zafirr | 5⯁ (Master) | 2 |
| WIC\* | 4n0nym4u5 | 6✦ (Append) | 0 |

Reverse Engineering

<img src=" align="right" width=200>

| Name | Author | Difficulty | Solves |
| ---------------------------------------------------------- | ---------------- | ----------- | -----: |
| Sekai Bank - Signature | Marc | 1⯁ (Easy) | 215 |
| Gondola | 3dsboy08, es3n1n | 2⯁ (Normal) | 81 |
| sekai-craft\* | es3n1n | 2⯁ (Normal) | 35 |
| Miku Music Machine | molenzwiebel | 3⯁ (Hard) | 30 |
| Alchemy Master | es3n1n | 4⯁ (Expert) | 8 |
| What in Ternation | molenzwiebel | 4⯁ (Expert) | 7 |

Web

<img src=" align="right" width=200>

| Name | Author | Difficulty | Solves |
| -------------------------------------------------------------------------- | ------------ | ----------- | -----: |
| My Flask App | belugagemink | 1⯁ (Easy) | 451 |
| Fancy Web | DimasMaulana | 2⯁ (Normal) | 0 |
| vite | irogir | 2⯁ (Normal) | 1 |
| hqli-me | irogir | 3⯁ (Hard) | 3 |
| Notebook | Qyn | 3⯁ (Hard) | 11 |
| Capti Can\* | Qyn | 4⯁ (Expert) | 1 |
| rednote | strellic | 4⯁ (Expert) | 4 |

Bounties

Challenges marked with an asterisk (*) were eligible for bounties during the CTF. For certain unsol, the bounty remained a after the competition concluded:

| Category | Name | Difficulty | Solves | Bounty |
| ------------------- | ------------------------------------------------------------------------ | ----------- | -----: | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------: |
| Cryptography | Law And Order | 4⯁ (Expert) | 0 | (Bad handout) <img src=" width=20> $400 |
| Binary Exploitation | WIC | 6✦ (Append) | 0 | <img src=" width=20> $200 |
| Cryptography | unfairy-ring++ | 6✦ (Append) | 0 | <img src=" width=20> $200 |
| Blockchains | チケットマスター | 5⯁ (Master) | 3 | <img src=" width=20> $100, <img src=" width=20> $50, <img src=" width=20> $30 |
| Blockchains | Stray Cat | 4⯁ (Expert) | 8 | <img src=" width=20> $100, <img src=" width=20> $50, <img src=" width=20> $30 |
| Blockchains | Sekai Lending | 3⯁ (Hard) | 11 | <img src=" width=20> $100, <img src=" width=20> $50, <img src=" width=20> $30 |
| Blockchains | Sekai Meme Launcher | 2⯁ (Normal) | 13 | <img src=" width=20> $100, <img src=" width=20> $50, <img src=" width=20> $30 |
| Cryptography | unfairy-ring | 5⯁ (Master) | 0 | <img src=" width=20> $100 |
| Reverse Engineering | sekai-craft | 2⯁ (Normal) | 35 | (Fastest run) $50 |
| Web | Capti Can | 4⯁ (Expert) | 1 | <img src=" width=20> $50 |

License

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

<blockquote>

SEKAI CTF 2025 Challenges and Solutions
Copyright (C) 2025 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 3 of the License, or
(at your option) any later .

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 ha a copy of the GNU Affero General Public License
along with this program. If not, see <

</blockquote>

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

> SEKAI CTF 2025 Challenges and Solutions by Project SEKAI CTF team and contributors is licensed under a [Creati Attribution-NonCommercial-ShareAlike 4.0 International License][cc-by-nc-sa].

[Banner]:
[Stars]:
[CTFTime]:
[Website]:
[Blog]:
[Twitter]:
[Discord]:
[agpl]:
[cc-by-nc-sa]:
[Non-Code License]:
[Code License]:

项目信息

开发语言：TypeScript

Star 数：137

技术要点

该项目属于CTF思路方向的开源资源，代码结构清晰，适合安全研究人员学习参考。项目围绕🎵 Official source code and writeups for SekaiCTF 2025!展开，提供了可运行的实现，对理解相关安全机制、工具原理与攻防技术具有较高的研究价值。

从技术实现角度看，此类项目的核心在于对底层原理的深入理解与工程化落地。开发者在研究过程中可以结合官方文档与社区讨论，梳理项目的初始化流程、核心模块职责与数据流转，逐步掌握其中的技术细节与设计思路。

使用与学习建议

1. 下载源码压缩包，解压到本地环境。

2. 根据项目类型准备对应的运行环境与依赖。

3. 按照 README 中的步骤完成配置与部署。

4. 在隔离的测试环境中运行验证，避免影响生产系统。

免责声明

本资源来源于开源社区，仅供安全研究、技术学习与合法授权范围内的攻防演练使用，请勿用于任何非法或侵害他人权益的用途。使用本项目产生的一切后果由使用者自行承担。