Case study

VTech VM901: reconstructing camera authentication and media access

VTech VM901 reconstructs the camera's authentication and media workflow for a Home Assistant bridge. The Go and C implementation uses TUTK/Kalay transport, performs the documented X25519 and ChaCha20-Poly1305 exchange, decrypts H.264 and G.711 media, and publishes streams through go2rtc.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 3
Last commit: 2026-08-26
Language: Go
License (GitHub): MIT

GitHub data as of 2026-11-10

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Evidence

Observed: Code and documentation observed; no download method or demo found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: An owned or authorized VM901 camera and account are required.
Prerequisites: The Android/bionic ARM64 runtime needs locally extracted SDK libraries and application values; the account bootstrap uses an authenticated request from the official app.
Testing evidence: The author reports testing on a local camera during the original research.
License: MIT License for repository source; locally extracted components retain their own terms.

Cite

BibTeX

@misc{vtech-vm901-home-assistant-case,
  title = {{VTech VM901: reconstructing camera authentication and media access}},
  howpublished = {\url{https://github.com/Termina1/vtech-vm901-home-assistant}},
  url = {https://github.com/Termina1/vtech-vm901-home-assistant},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/vtech-vm901-home-assistant-case/}}
}

Plain text

VTech VM901: reconstructing camera authentication and media access. https://github.com/Termina1/vtech-vm901-home-assistant (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/vtech-vm901-home-assistant-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

README.md GitHub · Termina1/vtech-vm901-home-assistant · Revision 383375e
docs/architecture.md GitHub · Termina1/vtech-vm901-home-assistant · Revision 383375e
NOTICE.md GitHub · Termina1/vtech-vm901-home-assistant · Revision 383375e