# FlyBird-ProtocolAnalysis: FlyBird client subscription protocol and APXS v2 format

> FlyBird-ProtocolAnalysis investigates the FlyBird proxy client's subscription delivery and APXS v2 format across Windows, Android, Linux and OpenWrt. Its reports describe client static analysis, process-memory inspection, GDB breakpoints and TLS observation; accompanying code decrypts the envelope and reproduces the documented mTLS request flow using user-supplied account credentials and certificates from the user's installed client.

- Type: Case study
- Targets: App · Binary · Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-08
- Original resource: <https://github.com/Angel-Gril/FlyBird-ProtocolAnalysis>
- Primary source: <https://github.com/Angel-Gril/FlyBird-ProtocolAnalysis/blob/a832a47c4cc1d7a7aaf0449ab40c3f5d7af6e767/docs/01-overview.md>
- Catalog page: <https://awesomerea.org/resources/flybird-protocol-analysis-case/>
- Record JSON: <https://awesomerea.org/resources/flybird-protocol-analysis-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/flybird-protocol-analysis-case/index.md)

## Requirements & limits

- **Prerequisites:** Subscription retrieval requires user-supplied account credentials and certificate files exported from the user's installed client.
- **Prerequisites:** The source describes Python 3, with additional client binaries and GDB for some tracing routes.
- **Testing evidence:** The author reports byte-for-byte matching of decrypted output and an approximately eight-second protocol route.
- **License:** MIT.

## Primary sources

1. <https://github.com/Angel-Gril/FlyBird-ProtocolAnalysis/blob/a832a47c4cc1d7a7aaf0449ab40c3f5d7af6e767/docs/01-overview.md>
2. <https://github.com/Angel-Gril/FlyBird-ProtocolAnalysis/blob/a832a47c4cc1d7a7aaf0449ab40c3f5d7af6e767/README.md>
3. <https://github.com/Angel-Gril/FlyBird-ProtocolAnalysis/blob/a832a47c4cc1d7a7aaf0449ab40c3f5d7af6e767/docs/02-client-architecture.md>

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.