Off the grid

About Off the grid Android App

Off the Grid is effectively a password manager that will help you create different passwords for different websites. Passwords are generated by simply typing in text - the program will use a Latin square (of Sudoku fame) to scan for the password using a specific pattern. The generated Latin square (grid) can be printed out and kept safe so that passwords can be retrieved without a device.

This application is a tribute to GRC's work on password generation using Latin squares: https://www.grc.com/OffTheGrid.htm

OTG (Off the Grid) is particularly useful for sharing passwords. You can simply generate a grid and then scan in the QR code on each persons device; they will then all be able to retrieve the password for "example" by simply typing in "example".
This password sharing could be useful for couples/colleagues with various shared accounts or
IT departments that need to access the same servers with the same password.

The following permissions are used:

android.permission.CAMERA - this is to capture the QR codes for previous grids.
android.permission.INTERNET - this is used to collecting analytics on usage of the application. android.permission.WRITE_EXTERNAL_STORAGE - this is used to temporarily write an encrypted zip file to so it can be emailed.
android.permission.WAKE_LOCK - this is used to keep the screen on while the password is displayed.

There is no master password, so it is advised that you also have a remote wipe tool and lock code for your device.

Warning: this app should NOT be used if your device has been rooted. Why? - Off the Grid relies on being sandboxed by Android; when you root your device other applications may be able to read inside the sandbox created for it.