Here's an idea that would improve security in conjunction with the new sensor: Create a random pattern of ridges and, using the technique outlined in the OP, b

Here's an idea that would improve security in conjunction with the new sensor: Create a random pattern of ridges and, using the technique outlined in the OP, build a latex key. Attach that to your keychain (in some sort of case to improve durability, maybe). Then, enjoy 2-factor auth, between the phone's pass code and the synthetic fingerprint.