Lock down the mobile app.
Please lock down mobile app every time it goes out of sight. If it stores encryption password and uses it automatically, it's OK, but it should ask for system password every time it appears in sight. Fingerprint usage would be nice, but even without it, it will be secure. Right now I touch the icon and thats it. Not very secure. SIMSme does it right.
You can now add PIN and Touch ID functionality to be implemented every time the app is not in use: https://protonmail.com/support/knowledge-base/touchid-and-pin-code/.
In addition, if the code is entered incorrectly more than 10 times, all the data will be wiped from the device: https://protonmail.com/blog/protonmail-mobile-v1-4-0-release-notes/.
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Bella commented
You have a subscriber mousetail8@protonmail.com who just sent me a nefarious and an extremely threatening email. I have reported the phone numbers associated and the same email address to Internet Crime of the FBI. IC3.
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Manny Lam commented
A 4-digit pin code to access the app would be ideal. Apps like Dropbox and CloudMagic already have this feature, providing an extra layer of security on your smartphone.
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Anonymous commented
Yes this is the next feature i would like to have in protonmail, it´s essential if you use a app for encrypted messaging on your mobile!