Cryptology ePrint Archive: Report 2019/006 Date: submitted by
2019-01-02 Author(s): Antonio Marcedone, Rafael Pass, abhi shelat
We introduce the notion of two-factor signatures (2FS), a generalization of a two-out-of-two threshold signature scheme in which one of the parties is a hardware token which can store a high-entropy secret, and the other party is a human who knows a low-entropy password. The security (unforgeability) property of 2FS requires that an external adversary corrupting either party (the token or the computer the human is using) cannot forge a signature. This primitive is useful in contexts like hardware cryptocurrency wallets in which a signature conveys the authorization of a transaction. By the above security property, a hardware wallet implementing a two-factor signature scheme is secure against attacks mounted by a malicious hardware vendor; in contrast, all currently used wallet systems break under such an attack (and as such are not secure under our definition). We construct efficient provably-secure 2FS schemes which produce either Schnorr signature (assuming the DLOG assumption), or EC-DSA signatures (assuming security of EC-DSA and the CDH assumption) in the Random Oracle Model, and evaluate the performance of implementations of them. Our EC-DSA based 2FS scheme can directly replace currently used hardware wallets for Bitcoin and other major cryptocurrencies to enable security against malicious hardware vendors.
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Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller, Steven Goldfeder Bitcoin and Cryptocurrency Technologies provides a comprehensive introduction to the revolutionary yet often misunderstood new technologies of digital currency. and construct a DNF wallet, a wallet that utilizes our signature scheme and realizes any access structure (ac-cess control policy) expressed as a disjunctive normal formula. As a special case of a DNF wallet we derive a threshold Bitcoin wallet. A key aspect of the construc-tion is to realize threshold deterministic wallets, a prop- by Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller, and Steven Goldfeder The broad target audience of the book includes students, software developers, computer science researchers, and entrepreneurs, as the authors take on different approaches to explaining Bitcoin and cryptos. Bitcoin and Cryptocurrency Technologies | Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller, Steven Goldfeder | download | B–OK. Download books for free. Find books Bitcoin and Cryptocurrency Technologies Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller, Steven Goldfeder Draft — Oct 6, 2015 Feedback welcome! Email [email protected]
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