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Title:
On the Joint Security of Encryption and Signature in EMV
Authors: Jean Paul Degabriele, Anja Lehmann, Kenneth G. Paterson, Nigel P. Smart, Mario Strefler
Abstract:We provide an analysis of current and future algorithms for signature and encryption in the EMV standards in the case where a single key-pair is used for both signature and encryption. We give a theoretical attack for EMV’s current RSA-based algorithms, showing how access to a partial decryption oracle can be used to forge a signature on a freely chosen message. We show how the attack might be integrated into EMV’s CDA protocol flow, enabling an attacker with a wedge device to complete an offline transaction without knowing the cardholder’s PIN. Finally, the elliptic curve signature and encryption algorithms that are likely to be adopted in a forthcoming version of the EMV standards are analyzed in the single key-pair setting, and shown to be secure.
ePrint: https://eprint.iacr.org/2011/615
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