We made fake fingerprints and hacked into a Nokia 5

We recently spent many hours (and melted candles) trying to make a fake fingerprint which could fool a Samsung Galaxy S9’s sensor.

Our silicone-based fake fingerprint was cast in a high-fidelity wax mould of a finger registered to unlock the device, and the finished product looked like an impressive recreation.

However, building a 3D prosthetic fingerprint with an accurate pattern of ridges and valleys was not enough to fool the Samsung device.

Modern smartphones use capacitive sensors to authenticate fingerprints, and these sensors measure the relative capacitance between ridges and valleys to create an artificial image of a fingerprint.

The reason our silicone recreation was not recognised was due to its capacitance, as it was not the same as human skin – and was therefore ignored by the smartphone’s touchscreen and fingerprint sensor.

After much feedback from MyBroadband Forum members, we set out to try a new technique – using new

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