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aNote

Initial Password Setup Main Screen Adding Pin Adding Note
Initial Password Setup Main Screen Adding Pin Adding Note

Intro

Android app (my first!) for securely storing pins and notes. After initial setup - where a password is used to encrypt the database - all auth is carried out using the users' fingerprint. This app was built for me. My requirements were:

  • Be able to access a pin (e.g. bank pin) quickly and securely, without the need for a password.
  • For pins, I only need a short key (e.g. the first letter of the bank name) to be able to identify its purpose.
  • Be able to store other sensitive notes (e.g. passport details).
  • Lock some pins/notes, so that fingerprint auth is required again to unlock them. This means I don't need to close the app every time it's sent to the background.
  • Keep all notes in an encrypted database.
  • No ads.

Requirements

  • JDK 8
  • Android SDK 28
  • Phone with fingerprint scanner

External Dependencies

Further Info

Database

An SQLCipher database is used. Encryption is performed with a password on first-use of the app. The password itself is encrypted then stored in the app's shared preferences, and the encryption key is stored in the Android KeyStore. This is a one-off process: the encryption password is never asked for again, and cannot be changed.

Future access to the app requires a fingerprint. On successful auth, the password is decrypted and used to unlock the database.

Tests

JUnit5 tests are written for non-activity classes. If I take this any further, I'll probably use Roboelectric to write tests for activity classes.

Known Issues

  • The action bar currently has no functionality.
  • Two separate grids are used for pins and "other notes". If one of the grids is empty, the other doesn't resize to full-screen.
  • App has only been tested on a Pixel 2. I have no current plans to adapt the UI for different screen sizes.
  • Would be ideal to have auto-resizable TextViews, so that text fits nicely on the main page.
  • Lock icon sometimes dissapears for notes after scrolling through them.

Play Store

This app is not available on the Play Store. I don't have enough time to maintain it at a standard I'd be happy with.