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arXiv · 2403.01048

Attacking the Diebold Signature Variant -- RSA Signatures with Unverified High-order Padding

Ryan W. Gardner·Tadayoshi Kohno·Alec Yasinsac
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Abstract

We examine a natural but improper implementation of RSA signature verification deployed on the widely used Diebold Touch Screen and Optical Scan voting machines. In the implemented scheme, the verifier fails to examine a large number of the high-order bits of signature padding and the public exponent is three. We present an very mathematically simple attack that enables an adversary to forge signatures on arbitrary messages in a negligible amount of time.

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Ryan W. Gardner, Tadayoshi Kohno, Alec Yasinsac. 2024-03-02. Attacking the Diebold Signature Variant -- RSA Signatures with Unverified High-order Padding. https://arxiv.org/abs/2403.01048

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