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About me

Tancrède Lepoint is a cryptography engineer at Apple. He is also a director of the International Association for Cryptologic Research (2018-2023) and co-editor of the Cryptology ePrint Archive. Previously, he was a research scientist in the Private Computing team at Google, and a computer scientist at SRI International.

Tancrède drove the cryptographic deployment of the Exposure Notifications Privacy-preserving Analytics within Google, a differentially-private multiparty computation system based on the private measurement system Prio. He also designed the multi-server verification flow for Exposure Notifications in the US. He worked on lightweigth anonymous credentials (Privacy-Pass, trust tokens) and specializes in homomorphic encryption. Tancrède is also a coauthor of two post-quantum cryptographic primitives (CRYSTALS-Kyber and CRYSTALS-Dilithium), which are 2 of the 7 finalists considered for standardization by NIST.

His research interests include cryptography and security, privacy-enhancing technologies, differential privacy, homomorphic encryption, cryptographic protocols and implementation.

He holds a Ph.D. in Computer Science from École Normale Supérieure and University of Luxembourg.

Other news

• Apr 2022: The chapter Private Set Intersection and Compute of the Protecting Privacy through Homomorphic Encryption book is now available. The preprint Communication-efficient proactive MPC for dynamic groups with dishonest majorities has been accepted for publication at ACNS 2022. The preprint In-app cryptographically-enforced selective access control for Microsoft office and similar platforms has been accepted for publication at CSCML 2022.
• Aug. 2021: Our preprint Private Join and Compute from PIR with Default has been accepted for publication at Asiacrypt 2021, and On the (in)security of ROS has received the best paper award at Eurocrypt 2021.
• Jun. 2021: Our preprint Advances and Open Problems in Federated Learning is now published in Foundations and Trends in Machine Learning, Volume 14.
• May 2021: Our preprint Communication-Computation Trade-offs in PIR has been accepted for publication at Usenix 2021.
• Mar. 2021: I am now working at Apple Inc.!
• Feb. 2021: Our paper On the (in)security of ROS has been accepted for publication at Eurocrypt 2021.
• Nov. 2020: Thank you for electing me as Director of the IACR for 2021-2023!

Program committees

• 2023: USENIX SECURITY.
• 2022: USENIX SECURITY.
• 2021: CHES, USENIX SECURITY, IEEE S&P, CT-RSA.
• 2020: WAHC (chair), CHES, USENIX SECURITY, EUROCRYPT, CT-RSA.
• 2019: SSR, WAHC (chair), USENIX SECURITY, PKC, CT-RSA.
• 2018: SSR, WAHC, SCN, CHES, CRYPTO, AFRICACRYPT, COSADE, PQCRYPTO, CT-RSA.
• 2017: INDOCRYPT, CANS, CHES, PQCRYPTO, EUROCRYPT, WAHC, CT-RSA.
• 2016: CHES, ICITS, WAHC.
• 2015: CANS, SECICT, ACNS, ACISP, WAHC.