Case study

Aion 2: reconstruction of the client-to-server network protocol

Aion 2 Network Protocol Research reconstructs parts of the game's client-to-server network protocol from captures and client inspection. It documents unsigned-varint framing, LZ4 bundles, an RSA-OAEP-SHA1 world handshake and continuous RC4 over post-handshake client frame bodies. Python tools analyze captures, recover session material and implement client cryptographic primitives.

Targets: Game · Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06

Stars: 19
Last commit: 2026-10-10
Language: Python
License (GitHub): MIT

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: Python 3.10 or later is required; live opcode viewing and process-memory tools target the Windows client.
Limits: The documented snapshot is the Global client revision 3527; most client-to-server payload meanings remain unmapped.
Testing evidence: The author reports validation of the RC4 model across six independently keyed sessions.
License: MIT license.

Cite

BibTeX

@misc{aion2-protocol-research-case,
  title = {{Aion 2: reconstruction of the client-to-server network protocol}},
  howpublished = {\url{https://github.com/lunixxx37/aion2-protocol-research}},
  url = {https://github.com/lunixxx37/aion2-protocol-research},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/aion2-protocol-research-case/}}
}

Plain text

Aion 2: reconstruction of the client-to-server network protocol. https://github.com/lunixxx37/aion2-protocol-research (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/aion2-protocol-research-case/

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Primary sources

README.md GitHub · lunixxx37/aion2-protocol-research · Revision fe2122f
docs/PROTOCOL.md GitHub · lunixxx37/aion2-protocol-research · Revision fe2122f