{
  "id": "sekaictf-2023-randsubware",
  "title": "Challenge archive: SekaiCTF 2023 - RandSubWare",
  "challenge_name": "RandSubWare",
  "year": 2023,
  "category": "Cryptography",
  "authors": [
    "deut-erium"
  ],
  "mode": "interactive",
  "event": {
    "id": "sekaictf-2023",
    "series": "SekaiCTF",
    "label": "2023",
    "starts_at": "2023-08-25T16:00:00+00:00",
    "date_source": "https://ctftime.org/event/1923",
    "year": 2023
  },
  "article_url": "https://deut-erium.github.io/challenges/sekaictf-2023/randsubware/",
  "article_path": "/challenges/sekaictf-2023/randsubware/",
  "text_url": "https://deut-erium.github.io/challenges/sekaictf-2023/randsubware/challenge.txt",
  "text_path": "/challenges/sekaictf-2023/randsubware/challenge.txt",
  "json_url": "https://deut-erium.github.io/challenges/sekaictf-2023/randsubware/challenge.json",
  "json_path": "/challenges/sekaictf-2023/randsubware/challenge.json",
  "statement": {
    "label": "Description excerpt",
    "text": "\"RandSubWare\" - standing for 'Random Substitution Warefare Challenge'. This term encompasses the idea of breaking a substitution permutation network through the use of randomized and strategic attacks on the substituted boxes, engaging in a battle against the complexity and obscurity of the encryption."
  },
  "notes": [
    "The original remote service is retired. Browser practice runs locally with the public dummy reward practice{local_dummy_reward}; it does not award an event solve.",
    "The original remote service is retired. Browser practice runs locally with the public dummy reward practice{local_dummy_reward}, not an event flag or authoritative score. No TCP endpoint is provided."
  ],
  "files": [
    {
      "name": "chall.py",
      "label": "chall.py",
      "kind": "handout",
      "url": "https://deut-erium.github.io/assets/challenges/sekaictf-2023-randsubware/chall.py",
      "path": "/assets/challenges/sekaictf-2023-randsubware/chall.py",
      "bytes": 9271,
      "sha256": "e8f1adc85143e5213f2992d735383862482da62d1f9356b87fabb63909e50c4f",
      "upstream_url": "https://raw.githubusercontent.com/project-sekai-ctf/sekaictf-2023/4dc0f1fb2836c64b3a502e2538ba32530996b8c9/crypto/randsubware/dist/chall.py"
    }
  ],
  "spoilers": {
    "warning": "Spoilers: organizer files and upstream source, archive, or solution links may reveal answers. Modified downloads are identified below.",
    "files": [

    ],
    "source_url": "https://github.com/project-sekai-ctf/sekaictf-2023/blob/4dc0f1fb2836c64b3a502e2538ba32530996b8c9/crypto/randsubware/README.md",
    "archive_url": "https://github.com/project-sekai-ctf/sekaictf-2023/tree/4dc0f1fb2836c64b3a502e2538ba32530996b8c9/crypto/randsubware",
    "solution_url": "https://github.com/project-sekai-ctf/sekaictf-2023/tree/4dc0f1fb2836c64b3a502e2538ba32530996b8c9/crypto/randsubware/solution"
  },
  "licenses": [
    {
      "url": "https://deut-erium.github.io/assets/challenges/licenses/AGPL-3.0.txt",
      "path": "/assets/challenges/licenses/AGPL-3.0.txt",
      "name": "AGPL-3.0",
      "bytes": 34523,
      "sha256": "8486a10c4393cee1c25392769ddd3b2d6c242d6ec7928e1414efff7dfb2f07ef",
      "upstream_url": "https://raw.githubusercontent.com/project-sekai-ctf/sekaictf-2022/383b16da68c438c5d516e6f00b2716210141f7a4/LICENSE"
    },
    {
      "url": "https://deut-erium.github.io/assets/challenges/licenses/CC-BY-NC-SA-4.0.txt",
      "path": "/assets/challenges/licenses/CC-BY-NC-SA-4.0.txt",
      "name": "CC BY-NC-SA 4.0",
      "bytes": 19119,
      "sha256": "14d2138e3a8bd9448254f171b8e17130bf7104d2fd843ab0b924bd105fd00d5a",
      "upstream_url": "https://raw.githubusercontent.com/project-sekai-ctf/sekaictf-2022/383b16da68c438c5d516e6f00b2716210141f7a4/LICENSE.content.md"
    }
  ],
  "browser_practice": {
    "runtime": "randsubware",
    "variants": [
      "default"
    ],
    "launch_url": "https://deut-erium.github.io/challenges/sekaictf-2023/randsubware/#browser-practice",
    "launch_path": "/challenges/sekaictf-2023/randsubware/#browser-practice"
  }
}