SnapShh…! Privacy Mediator (P2P-based P3F)

This is our acvtive Android solution to the picture privacy problem. You can find the App in Google Play Store and install it for free.

Source code licensed under GPL 3.0 (Hint: You will need to insert your own GCM API key): (14MB) Version 1.0 2016-06-15

P3F Implementation 1.0.5 (Pattern-based P3F)

All our parts are released under GPL 3.0 or newer.
Contains works under other free licenses (GrabCut/GraphCut under GPL2 and works from Vojtech Franc, Vaclav Hlavac and Masayuki Tanaka marked as such, including their copyright statements). (52MB)  Version 2015-03-06 (39MB) Version 2015-03-14 (41MB) Version 2015-04-03 (41MB) Version 2015-06-19
tshirt-templates1 (PDF, License: CC-BY, commercial use permitted)

Requirements:  Matlab 8.2 under Linux, Windows or Mac (cheap Student Version with Image Toolbox is enough); (GNU) C++ compiler for GrabCut — see README_GrabCut.txt


  • Many test images have been removed from the release package due to copyright reasons.
  • More documentation will be available by end of March.
  • Performance is not final; will need heavy tuning.
  • Implemented decoders supported policies are currently binary only: Blur yes/no.
  • However, Framework is prepared for multidimensional policies.
  • We will release specifications for Patterns shortly.

We welcome additions to our Framework! Especially, encodings that unobtrusively fit into common clothing styles.


These are academic publications from the P3F ecosystem.

Framework based on Privacy Policy Hiding for Preventing Unauthorized Face Image Processing
Adrian Dabrowski, Edgar R. Weippl, Isao Echizen
Proceedings of the IEEE International Conference on Systems, Man, and Cybernetics (SMC2013), DOI 10.1109/SMC.2013.83
[ PDF ] [ IEEE Xplore ] [ BibTex ]

Ok Glass, Leave me Alone: Towards a Systematization of Privacy Enhancing Technologies for Wearable Computing
Katharina Krombholz, Adrian Dabrowski, Matt Smith, Edgar R. Weippl
Proceedings of Workshop on Wearable Security and Privacy co-located with Financial Cryptography and Data Security 2015
[ PDF ] [ BibTex ]

Tag Detection for Preventing Unauthorized Face Image Processing
Alberto Escalada Jimenez, Adrian Dabrowski, Juan M Montero Martinez, Isao Echizen
The 13th International Workshop on Digital-forensics and Watermarking (IWDW 2014)
[ pre-print PDF ] [ BibTex ]

Privacy for Everyone: Towards an Inclusive Design Approach for Accessible Privacy and Security Technology
Katharina Krombholz, Christopher Frauenberger, Edgar Weippl
SOUPS 2015 Workshop on Inclusive Privacy and Security
[ PDF ]

Browser History Stealing with Captive Wi-Fi Portals
Adrian Dabrowski, Georg Merzdovnik, Nikolaus Kommenda, Edgar Weippl
Proceedings of Mobile Security Technologies (MoST) 2016 at IEEE Security & Privacy Workshops
[ pre-print PDF ] [ BibTex ]

Exploring Design Directions for Wearable Privacy
Katharina Krombholz, Adrian Dabrowski, Matthew Smith, and Edgar Weippl
In Proceedings of USEC Mini Conference 2017 co-located with NDSS Symposium 2017.
[ pre-print PDF ] [ BibTex ]

Other Project Materials

Licenses apply for our own work, and not for cited or otherwise referenced material.

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