Case study

Yu-Gi-Oh! Online 3: reconstructing early server exchanges and YPK extraction

ygo3-research reconstructs early Yu-Gi-Oh! Online 3 server exchanges and provides a YPK archive extractor. Its experimental Python server responds to observed authentication, profile, player-list and selection requests and documents packet encryption, length masking and nested data encoding. The client currently stops after player selection.

Targets: Game · Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C1 partial scope or analysis entry

Stars: 0
Last commit: 2026-11-06
Language: Python
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Demo screenshot from the project's public documentation

Observed: Download and demo observed; the case covers part of the target software.
Scope: Partial
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: Windows, Python 3.12 and PyCryptodome for the local server; the YPK extractor uses the Python standard library.
Prerequisites: The original game client and local configuration are needed for server experiments.
Limits: Development is paused; offline play and duel functionality are incomplete.
License: MIT License.

Cite

BibTeX

@misc{ygo3-research-case,
  title = {{Yu-Gi-Oh! Online 3: reconstructing early server exchanges and YPK extraction}},
  howpublished = {\url{https://github.com/iteratequickly/ygo3-research}},
  url = {https://github.com/iteratequickly/ygo3-research},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/ygo3-research-case/}}
}

Plain text

Yu-Gi-Oh! Online 3: reconstructing early server exchanges and YPK extraction. https://github.com/iteratequickly/ygo3-research (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/ygo3-research-case/

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Primary sources

README.md GitHub · iteratequickly/ygo3-research · Revision 25afbbb