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arXiv · 1501.00447

How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys

Stephan Verbücheln
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Abstract

ECDSA has become a popular choice as lightweight alternative to RSA and classic DL based signature algorithms in recent years. As standardized, the signature produced by ECDSA for a pair of a message and a key is not deterministic. This work shows how this non-deterministic choice can be exploited by an attacker to leak private information through the signature without any side channels, an attack first discovered by Young and Yung for classic DL-based cryptosystems in 1997, and how this attack affects the application of ECDSA in the Bitcoin protocol.

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Stephan Verbücheln. 2015-01-02. How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys. https://arxiv.org/abs/1501.00447

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