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This thesis presents three new attacks on electronic payment equipment having mechanical keypads, known as “PIN pads”. We show in three different ways how they have security vulnerabilities at the physical layer allowing the leak of the PIN (Personal Identification Number) when it is entered. We experimentally demonstrated that it is possible to infer with high success rate (100% in one of the attacks) the password entered on the device, in a non-invasive way. The attacks are based on the placement of sensors inside the equipment itself or in its operating environment: accelerometers for doing vibration analysis, microphones for acoustic analysis and load cells for measuring the pressing force. Due to massive deployment of sensors in consumer devices, information theft by unconventional means is increasing. The results of the low-cost attacks here developed expose serious shortcomings in the process of security certification of such equipment.

Novos ataques de canal secundário a dispositivos de entrada manual de dados confidenciais.