27 lines
1.8 KiB
Markdown
27 lines
1.8 KiB
Markdown
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# Android
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Collection based on [kuketz-blog.de](https://www.kuketz-blog.de/empfehlungsecke/).
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## App Store
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Not using the Google PlayStore as source for your apps is a huge step forward. Try to replace your apps with privacy-friendly apps from the [fdroid app store](https://f-droid.org/).
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## Captive portal
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Periodically and on connect/disconnect of any Internet connection, Android queries a server endpoint from Google to test if Internet connectivity is (still) available. Sometimes you might have already seen a small 'x' indicating you have no Internet access. This is the result of this query. Those queries are logged consistently by Google: the time when you accessed it, with which device you accessed it and the IP you had when you accessed it. Just for the connectivity check you're giving away so much information.
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The `adb` cli tools provide a way to set a different captive portal not owned by Google which don't log data. You should change it. See `captiveportal.sh` for an example.
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## DNS
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By default Android will use Google DNS servers not secured with SSL. Starting from Android 8, Android provides means to overcome this by setting a _private DNS_ server in `Settings -> Network & internet -> Private DNS`. For example, set it to `fdns1.dismail.de`.
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## Scanning
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You're giving away information when you keep your WiFi on. Your device will automatically scan for nearby access points. Therefore you'll be uniquely identifiable across locations.
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To overcome follow these instructions:
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1. Disable WiFi and Bluetooth scanning because it's easily possible to create an accurate profile of your movement from it. In the settings, search for `Wi-Fi and Bluetooth scanning`.
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2. When you leave a known WiFi access point switch off your WiFi adapter. There are apps for this: [WiFi Automatic](https://f-droid.org/en/packages/de.j4velin.wifiAutoOff/).
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