This is the 1st iteration of the file encryption functionality, we will add more features as time allows.
At times, you will want to store some sensitive information in the cloud. If you don't want Google to snoop around in your files, it is a good idea to encrypt them. It will also protect your data if it is accidentally exposed to a third party.
You can encrypt single files on your smartphone using Send To aka Share functionality of your device as follows:
- Locate the file on your smartphone.
- Select OneMoreSecret from the Send To menu.
- OneMoreSecret will open the File Encryption screen as shown below. Select the key you want to use.
- Your file will be encrypted, the result has the same file name with .oms00 at the end.
- The Send To dialog will open again, this time for the resulting file.
If you want to decrypt an .oms00 file, just send it to OneMoreSecret again. It will ask for your fingerprint to access the required key, decrypt the data and bring up the Send To dialog for the resulting file.
You can also decrypt files that are stored on your PC. This feature is available in omsCompanion.
The encryption works exactly the same way the password encryption does. For every file, a unique AES key is generated, which is then encrypted by the RSA key you select in the dialog. The key is stored together with the encrypted data, so every file has all you need to decrypt it again - well, provided you have the right key in your phone.