HowTo

Building a Signing Server

December 18, 2017

The Android APK signing model sets the expectation that the signing key will be the same for the entire lifetime of the app. That can be seen in the …

Tracking usage without tracking people

June 8, 2017

One thing that has become very clear over the past years is that there is a lot of value in data about people. Of course, the most well known examples …

“If This, Then Panic!” Sample Code for Triggering Emergency Alerts

October 17, 2016

Earlier this year, we announced the PanicKit Library for Android and Ripple, our basic app for alerts any compatible app that you are in an emergency …

HOWTO: get all your Debian packages via Tor Onion Services

July 31, 2016

Following up on some privacy leaks that we looked into a while back, there are now official Debian Tor Onion Services for getting software packages …

Copperhead, Guardian Project and F-Droid Partner to Build Open, Verifiably Secure Mobile Ecosystem

March 28, 2016

Three open-source projects haved joined together to announce a new partnership to create an open, verifiably secure mobile ecosystem of software, …

How to Migrate Your Android App’s Signing Key

December 29, 2015

It is time to update to a stronger signing key for your Android app! The old default RSA 1024-bit key is weak and officially deprecated. What? The …

Hiding Apps in Plain Sight

May 7, 2015

Beyond just thinking about encryption of data over the wire, or at rest on your mobile device, we also consider physical access to your mobile device, …

Getting keys into your keyring with Gnu Privacy Guard for Android

December 6, 2013

Now that you can have a full GnuPG on your Android device with Gnu Privacy Guard for Android, the next step is getting keys you need onto your device …

A tag-team git workflow that incorporates auditing

November 21, 2013

Git is as wonderful as it is terrible, it is immensly flexible but also far from intuitive. So to make our lives easier, we try to use git as it was …

Your own private dropbox with free software

November 12, 2013

There are lots of file storage and sharing software packages out there that make it easy for a group of people to share files. Dropbox is perhaps the …