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  1. No Access

    Chapter and Conference Paper

    Powers-of-Tau to the People: Decentralizing Setup Ceremonies

    We propose several decentralized ceremonies for constructing a powers-of-tau structured reference string (SRS). Our protocols make use of a blockchain platform to run in a permissionless manner, where anyone c...

    Valeria Nikolaenko, Sam Ragsdale… in Applied Cryptography and Network Security (2024)

  2. No Access

    Chapter and Conference Paper

    Homomorphic Decryption in Blockchains via Compressed Discrete-Log Lookup Tables

    Many privacy preserving blockchain and e-voting systems are based on the modified ElGamal scheme that supports homomorphic addition of encrypted values. For practicality reasons though, decryption requires the...

    Panagiotis Chatzigiannis… in Data Privacy Management, Cryptocurrencies … (2022)

  3. No Access

    Chapter and Conference Paper

    Threshold Schnorr with Stateless Deterministic Signing from Standard Assumptions

    Schnorr’s signature scheme permits an elegant threshold signing protocol due to its linear signing equation. However each new signature consumes fresh randomness, which can be a major attack vector in practice...

    François Garillot, Yashvanth Kondi, Payman Mohassel… in Advances in Cryptology – CRYPTO 2021 (2021)

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    Chapter and Conference Paper

    Non-interactive Half-Aggregation of EdDSA and Variants of Schnorr Signatures

    Schnorr’s signature scheme provides an elegant method to derive signatures with security rooted in the hardness of the discrete logarithm problem, which is a well-studied assumption and conducive to efficient ...

    Konstantinos Chalkias, François Garillot… in Topics in Cryptology – CT-RSA 2021 (2021)

  5. No Access

    Chapter and Conference Paper

    Taming the Many EdDSAs

    This paper analyses security of concrete instantiations of EdDSA by identifying exploitable inconsistencies between standardization recommendations and Ed25519 implementations. We mainly focus on current ambig...

    Konstantinos Chalkias, François Garillot… in Security Standardisation Research (2020)

  6. Chapter and Conference Paper

    Lattice-Based DAPS and Generalizations: Self-enforcement in Signature Schemes

    Double authentication preventing signatures (DAPS) is a mechanism, due to Poettering and Stebila, for protecting certificate authorities (CAs) from coercion. We construct the first lattice-based DAPS signature...

    Dan Boneh, Sam Kim, Valeria Nikolaenko in Applied Cryptography and Network Security (2017)

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  7. Chapter and Conference Paper

    Fully Key-Homomorphic Encryption, Arithmetic Circuit ABE and Compact Garbled Circuits

    We construct the first (key-policy) attribute-based encryption (ABE) system with short secret keys: the size of keys in our system depends only on the depth of the policy circuit, not its size. Our constructio...

    Dan Boneh, Craig Gentry, Sergey Gorbunov… in Advances in Cryptology – EUROCRYPT 2014 (2014)

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