Cryptology ePrint Archive: Report 2004/197

SPA-based attack against the modular reduction within a partially secured RSA-CRT implementation

Helmut Kahl

Abstract: This note describes an SPA-based side channel attack against a CRT implementation of an RSA function. In contrast with Novak’s attack [8], it concentrates on the initial modular reduction. With the help of lattice reduction it applies even to implementations which use a common randomising technique to ensure resistance against certain side channel attacks.

Category / Keywords: implementation / RSA, CRT, smartcard, SPA, modular reduction, lattice reduction

Date: received 12 Aug 2004

Contact author: helmut kahl at de gi-de com

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Version: 20040812:181426 (All versions of this report)

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