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Sign Change Fault Attacks On Elliptic Curve Cryptosystems
Authors: Johannes Blömer, Martin Otto, Jean-Pierre SeifertAbstract:
We present a new type of fault attacks on elliptic curve scalar
multiplications: Sign Change Attacks. These attacks exploit different number representations as they are often employed in modern cryptographic applications. Previously, fault attacks on elliptic curves aimed to force a device to output points which are on a cryptographically weak curve. Such attacks can easily be defended against. Our attack produces points which do not leave the curve and are not easily detected. The paper also presents a revised scalar multiplication algorithm that provably protects against Sign Change Attacks.
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