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Side-Channel Analysis of Cryptographic RFIDs With Analog Demodulation

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Executive Summary

As most modern cryptographic Radio Frequency IDentification (RFID) devices are based on ciphers that are secure from a purely theoretical point of view, e.g., (Triple-) DES or AES, adversaries have been adopting new methods to extract secret information and cryptographic keys from contactless smartcards: Side-Channel Analysis (SCA) targets the physical implementation of a cipher and allows to recover secret keys by exploiting a side-channel, for instance, the Electro-Magnetic (EM) emanation of an Integrated Circuit (IC). In this paper, the authors present an analog demodulator specifically designed for refining the SCA of contactless smartcards.

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