Personal information

Websites & social links

Personal website
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Other IDs

Scopus Author ID: 57292325600

Keywords

Cryptography, Post-quantum Cryptography

Countries

Portugal

Biography

I'm a cyptography and security researcher at Brave. I specialize in privacy-enhancing technologies, lattice-based and multivariate-based cryptography, post-quantum cryptography, and real-world applications of zero-knowledge proofs. Previously, I contributed significantly to the Off-the-Record (OTR) messaging protocol and I'm a co-author the PQC Signature scheme "MAYO" submitted to NIST.
I also serve on the European review board at BlackHat. In addition, I am a member of the Advisory Council at the Open Technology Fund (OTF), and I server on various roles at the IETF/IRTF/W3C. I have also been involved in United Nations as an expert consultation, focusing on the intersection of human rights and technical standard-setting for emerging technologies.

Activities

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Employment (2)

Brave: Lisbon, PT

2022-05-01 to present | Cryptography Research (Research)
Employment
Source: Self-asserted source
Sofía Celi

Cloudflare: Lisbon, PT

2022-04-30 | Cryptography Researcher
Employment
Source: Self-asserted source
Sofía Celi

Works (9)

SoK: Signatures with Randomizable Keys

2025 | Book chapter
DOI: 10.1007/978-3-031-78679-2_9
Contributors: Sofía Celi; Scott Griffy; Lucjan Hanzlik; Octavio Perez-Kempner; Daniel Slamanig
Source: check_circle
Crossref

CDLS: Proving Knowledge of Committed Discrete Logarithms with Soundness

2024 | Book chapter
DOI: 10.1007/978-3-031-64381-1_4
Contributors: Sofia Celi; Shai Levin; Joe Rowell
Source: check_circle
Crossref

Nibbling MAYO: Optimized Implementations for AVX2 and Cortex-M4

IACR Transactions on Cryptographic Hardware and Embedded Systems
2024 | Journal article
DOI: 10.46586/tches.v2024.i2.252-275
EID:

2-s2.0-85187802593

Part of ISSN: 25692925
Contributors: Beullens, W.; Campos, F.; Celi, S.; Hess, B.; Kannwischer, M.J.
Source: Self-asserted source
Sofía Celi via Scopus - Elsevier

Call Me By My Name: Simple, Practical Private Information Retrieval for Keyword Queries

2024-12-02 | Conference paper
DOI: 10.1145/3658644.3670271
Contributors: Sofia Celi; Alex Davidson
Source: check_circle
Crossref

Practically-exploitable Cryptographic Vulnerabilities in Matrix

Proceedings - IEEE Symposium on Security and Privacy
2023 | Conference paper
DOI: 10.1109/SP46215.2023.10351027
EID:

2-s2.0-85173036868

Part of ISSN: 10816011
Contributors: Albrecht, M.R.; Celi, S.; Dowling, B.; Jones, D.
Source: Self-asserted source
Sofía Celi via Scopus - Elsevier

FrodoPIR: Simple, Scalable, Single-Server Private Information Retrieval

Proceedings on Privacy Enhancing Technologies
2023-01 | Journal article
DOI: 10.56553/popets-2023-0022
Part of ISSN: 2299-0984
Contributors: Alex Davidson; Gonçalo Pestana; Sofía Celi
Source: Self-asserted source
Sofía Celi via Crossref Metadata Search

A Fast and Simple Partially Oblivious PRF, with Applications

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
2022 | Conference paper
DOI: 10.1007/978-3-031-07085-3_23
EID:

2-s2.0-85128389386

Part of ISBN: 9783031070846
Part of ISSN: 16113349 03029743
Contributors: Tyagi, N.; Celi, S.; Ristenpart, T.; Sullivan, N.; Tessaro, S.; Wood, C.A.
Source: Self-asserted source
Sofía Celi via Scopus - Elsevier
grade
Preferred source (of 2)‎

A Tale of Two Models: Formal Verification of KEMTLS via Tamarin

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
2022 | Conference paper
DOI: 10.1007/978-3-031-17143-7_4
EID:

2-s2.0-85140767376

Part of ISBN: 9783031171420
Part of ISSN: 16113349 03029743
Contributors: Celi, S.; Hoyland, J.; Stebila, D.; Wiggers, T.
Source: Self-asserted source
Sofía Celi via Scopus - Elsevier
grade
Preferred source (of 2)‎

Implementing and Measuring KEMTLS

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
2021 | Conference paper
DOI: 10.1007/978-3-030-88238-9_5
EID:

2-s2.0-85116896139

Part of ISBN: 9783030882372
Part of ISSN: 16113349 03029743
Contributors: Celi, S.; Faz-Hernández, A.; Sullivan, N.; Tamvada, G.; Valenta, L.; Wiggers, T.; Westerbaan, B.; Wood, C.A.
Source: Self-asserted source
Sofía Celi via Scopus - Elsevier
grade
Preferred source (of 2)‎

Peer review (1 review for 1 publication/grant)

Review activity for Journal of cryptographic engineering. (1)
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