Step 1: Install Maildroid and Crypto Plugin
Maildroid works with IMAP mail servers and has actively-supported S/MIME encryption capabilities. Install the app via the app store or these links:
There is also an add-free paid version called Maildroid Pro.
Step 2: Private Certificate Installation
After installing Maildroid and setting up your email account, copy your private certificate file (ending in .p12) to the device. This can be done via USB-connection or by sending and saving the file as attachment.
Next open Crypto Plugin > Import Certificate. Choose the *.p12 file. Enter the password.
Last open Crypto Plugin > Settings > Password Cache and set to Forever.
Step 3: Maildroid Setup
In Maildroid the following settings are recommended:
- Maildroid > Settings > Encryption Plugins > Sign by default? – YES
- Maildroid > Settings > Encryption Plugins > Show crypto bar – YES
Step 4: Public Certificate Installation
To send encrypted emails to other users, their public key needs to be installed in the app Crypto Plugin.
There are 2 methods to install a public certificate:
Method 1: Via signed Email (recommended)
- Open a signed email and click “Signed. Click to verify”
- On the next screen click the “I”-icon on the left.
- Then click “Certificate Path”. Now the certificate should be added to Crypto Plugin and available for use.
- Open Crypto Plugin (the app) to confirm the email address is listed under “S/MIME Certificates”. If not, repeat the last few steps.
Method 2: Via .cer file
- Copy the public certificate file(s) to your Android device by Email or USB.
- Open “Crypto Plugin”
- Select “Import Certificate”