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Sergei Skorobogatov, Computer Laboratory, University of Cambridge
Tuesday 31 October 2006, 16:15-17:15
Optically enhanced position-locked power analysis
- đ¤ Speaker: Sergei Skorobogatov, Computer Laboratory, University of Cambridge
- đ Date & Time: Tuesday 31 October 2006, 16:15 - 17:15
- đ Venue: Lecture Theatre 2, Computer Laboratory, William Gates Building
Abstract
This talk introduces a refinement of the power-analysis attack on integrated circuits. By using a laser to illuminate a specific area on the chip surface, the current through an individual transistor can be made visible in the circuit’s power trace. The photovoltaic effect converts light into a current that flows through a closed transistor. This way, the contribution of a single transistor to the overall supply current can be modulated by light. Compared to normal power-analysis attacks, the semi-invasive position-locking technique presented here gives attackers not only access to Hamming weights, but to individual bits of processed data. This technique is demonstrated on the SRAM array of a PIC16F84 microcontroller and reveals both which memory locations are being accessed, as well as their contents.
Series This talk is part of the Computer Laboratory Security Seminar series.
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