NTT Research and NTT R&D findings establish a foundation for next-generation digital privacy and security
News Highlights:
- Researchers with NTT Research, based in Silicon Valley, and NTT R&D, in Tokyo, have 17 papers accepted by international cryptography conference Eurocrypt 2026.
- A premier event showcasing the most-cutting edge research in the cryptographic field, Eurocrypt 2026 is taking place May 10-14 in Rome, Italy.
- Papers co-authored by NTT Research Cryptography & Information Security Lab Director Brent Waters examine threshold cryptography and identity-based encryption, while other NTT-affiliated papers explore secure multiparty computation, quantum security and more.
SUNNYVALE, Calif. and TOKYO – May 12, 2026 – NTT Research, Inc. and NTT R&D, divisions of NTT (TYO:9432), today announced that their scientists contributed 17 accepted papers to Eurocrypt 2026, one of the world’s most prestigious international conferences dedicated to the advancement of cryptographic research. The conference is organized annually by the International Association for Cryptologic Research (IACR) and is occurring this year from May 10-14 in Rome, Italy.
The accepted papers—14 from NTT Research’s Cryptography & Information Security (CIS) Lab and five from NTT R&D’s Social Informatics Laboratories (SIL), with collaboration between the CIS Lab and SIL on two of those papers—explore a range of cryptographic disciplines, including quantum-resistant security, identity-based encryption, and secure multi-party computation.
“Both the quality and quantity of accepted work at Eurocrypt 2026 are further evidence that NTT has established one of the world’s premier cryptographic research operations,” said Kazu Gomi, NTT Research president and CEO. “The fundamental research being conducted by NTT Research, NTT R&D and our collaborators today is the foundation upon which society’s future digital security and privacy will be built, as we face down new and emerging threats from artificial intelligence, quantum computing and beyond.”
Two Papers Co-Authored by NTT Research CIS Lab Direct Brent Waters
Two of the accepted papers were co-authored by Brent Waters, director of NTT Research’s CIS Lab and professor at the University of Texas, Austin. Waters’ co-authored papers at Eurocrypt 2026 examine threshold cryptography and identity-based encryption:
- “Silent Threshold Cryptography from Pairings: Expressive Policies in the Plain Model,” Brent Waters (UT Austin and NTT Research); David J. Wu (UT Austin)
This paper advances threshold cryptography, introducing constructions that support expressive access policies while operating entirely in the plain model without the need for a trusted setup or random oracles. Threshold cryptography allows a secret or cryptographic capability to be distributed across multiple parties such that only an authorized subset can act collectively. The “silent” property achieved in this work means participating parties need not broadcast or coordinate during key generation beyond minimal offline computation, dramatically improving practical efficiency. By building these results from pairing-based assumptions, Waters and Wu establish a new benchmark for what expressive policy-based threshold systems can achieve under standard cryptographic hardness.
- “Threshold Batched Identity-Based Encryption from Pairings in the Plain Model,” Junqing Gong (East China Normal University and Shanghai Qi Zhi Institute); Brent Waters (UT Austin and NTT Research); Hoeteck Wee (NTT Research); David J. Wu (UT Austin)
This paper tackles the challenge of constructing threshold identity-based encryption (IBE) that can handle batched ciphertexts efficiently, a problem with important implications for scalable encrypted communication systems. Identity-based encryption allows a user’s identity, such as an email address, to serve as their public key, eliminating complex certificate infrastructure. Extending this to the threshold setting, where decryption requires cooperation among multiple key-holding parties, and then batching many such operations efficiently, represents a significant technical achievement. Notably, this result is also achieved in the plain model from pairing-based assumptions, maintaining a clean theoretical foundation suitable for practical deployment. The paper features NTT Research Senior Scientist Hoeteck Wee as a co-author.
“Eurocrypt is one of the most competitive venues in all of cryptographic academia, and our team’s success at this event reflects the extraordinary caliber of researchers NTT has assembled in its global cryptography labs,” said Waters. “My colleagues at the CIS Lab and our collaborators at NTT SIL continue to push the boundaries of cryptographic understanding to help realize a future that ensures digital security and privacy from the enterprise to the individual.”
Waters is noted for pioneering attribute-based encryption (ABE) in a landmark 2004 paper co-authored with Amit Sahai, professor of computer science at UCLA.
At Upgrade 2026, NTT’s annual Silicon Valley technology summit, NTT Research announced the availability of the world’s first data security suite built on ABE, SaltGrain, via its newly launched technology incubator, Scale Academy.
Additional NTT-Affiliated Papers at Eurocrypt 2026
Beyond the two Waters papers, NTT Research and NTT R&D scientists are represented across a wide range of Eurocrypt 2026 sessions. Those contributions include:
- “Maintaining Sublinear Locality Over Time: Adaptively Secure MPC on a Reusable Hidden Graph,” Elette Boyle (Reichman University and NTT Research); Ran Cohen (Reichman University); Pierre Meyer (Aarhus University)
- “On the Cryptographic Futility of Non-collapsing Measurements,” Kabir Tomer (University of Illinois Urbana-Champaign); Dakshita Khurana (University of Illinois Urbana-Champaign, NTT Research); Tomoyuki Morimae (Kyoto University); Yuki Shirakawa (Kyoto University); Takashi Yamakawa (NTT); Alper Çakan (Carnegie Mellon University)
- “Simultaneous-Message and Succinct Secure Computation: Reusable and Multiparty Protocols,” Siddharth Agarwal (University of Toronto); Abhishek Jain (NTT Research and Johns Hopkins University); Akshayaram Srinivasan (University of Toronto); David J. Wu (UT Austin)
- “On Succinct Non-Interactive Secure Computation with Malicious Security,” Maya Farber Brodsky (Tel Aviv University); Arka Rai Choudhuri (zkBricks); Abhishek Jain (NTT Research and Johns Hopkins University); Omer Paneth (Tel Aviv University)
- “How to Copy-Protect Malleable-Puncturable Cryptographic Functionalities Under Arbitrary Challenge Distributions: A Unified Solution to Quantum Protection,” Alper Çakan (Carnegie Mellon University); Vipul Goyal (NTT Research & Carnegie Mellon University)
- “SQIsign2DPush: Faster Signature Scheme Using 2-Dimensional Isogenies,” Kohei Nakagawa (NTT Social Informatics Laboratories); Hiroshi Onuki (The University of Tokyo)
- “Collusion-Resistant Quantum Secure Key Leasing Beyond Decryption,” Fuyuki Kitagawa (NTT Social Informatics Laboratories); Ryo Nishimaki (NTT Social Informatics Laboratories); Nikhil Pappu (Portland State University)
- “Client-Server Homomorphic Secret Sharing in the CRS Model,” Damiano Abram (University of Edinburgh); Geoffroy Couteau (CNRS, Université Paris Cité); Lalita Devadas (Massachusetts Institute of Technology); Aditya Hegde (Johns Hopkins University); Abhishek Jain (NTT Research); Lawrence Roy (Aarhus University); Sacha Servan-Schreiber (Tinfoil)
- “Traceable Secret Sharing Revisited,” Vipul Goyal (NTT Research); Abhishek Jain (NTT Research & Johns Hopkins University); Aditi Partap (Stanford University)
- “Optimal Threshold Traitor Tracing,” Sourav Das (Category Labs); Pratish Datta (NTT Research); Aditi Partap (Stanford University); Swagata Sasmal (Indian Statistical Institute); Mark Zhandry (NTT Research, Stanford University)
- “Proofs of No Intrusion,” Vipul Goyal (NTT Research); Justin Raizes (NTT Research)
- “Copy-Protection from UPO, Revisited,” Prabhanjan Ananth (University of California, Santa Barbara); Amit Behera (NTT Research); Zikuan Huang (Tsinghua University); Fuyuki Kitagawa (NTT Social Informatics Laboratories, NTT Research Center for Theoretical Quantum Information); Takashi Yamakawa (NTT Social Informatics Laboratories, NTT Research Center for Theoretical Quantum Information)
- “Critical Rounds in Multi-Round Proofs: Proof of Partial Knowledge and Trapdoor Commitments,” Masayuki Abe (NTT Social Informatics Laboratories); David Balbás (ETH Zürich); Dung Bui (Sorbonne Université, CNRS, LIP6); Miyako Ohkubo (NICT); Zehua Shang (Kyoto University); Akira Takahashi (J.P. Morgan AI Research & AlgoCRYPT Center of Excellence); Mehdi Tibouchi (NTT Social Informatics Laboratories)
- “Adaptively Secure Partially Non-Interactive Threshold Schnorr Signatures in the AGM,” Renas Bacho (CISPA Helmholtz Center for Information Security); Yanbo Chen (University of Ottawa); Julian Loss (Ruhr University Bochum); Stefano Tessaro (University of Washington); Chenzhi Zhu (NTT Research)
- “Tweed: Adaptively Secure Lattice-Based Two-Round Threshold Signatures,” Kaijie Jiang (Tsinghua University); Stefano Tessaro (University of Washington); Hoeteck Wee (NTT Research); Chenzhi Zhu (NTT Research)
About NTT Research
NTT Research opened its offices in July 2019 in Silicon Valley to conduct basic research and advance technologies as a foundational model for developing high-impact innovation across NTT Group’s global business. Currently, four groups are housed at NTT Research facilities in Sunnyvale: The Physics and Informatics (PHI) Lab, the Cryptography and Information Security (CIS) Lab, the Medical and Health Informatics (MEI) Lab and the Physics of Artificial Intelligence (PAI) Group. The organization aims to advance science in four areas: 1) quantum information, neuroscience and photonics; 2) cryptographic and information security; 3) medical and health informatics; and 4) artificial intelligence. NTT Research is part of NTT, a global technology and business solutions provider with an annual R&D investment of thirty percent of its profits.
###
NTT and the NTT logo are registered trademarks or trademarks of NIPPON TELEGRAPH AND TELEPHONE CORPORATION and/or its affiliates. All other referenced product names are trademarks of their respective owners. ©2026 NIPPON TELEGRAPH AND TELEPHONE CORPORATION
| NTT Research Contact: Chris Shaw Chief Marketing Officer NTT Research +1-312-888-5412 chris.shaw@ntt-research.com | Media Contact: Nick Gibiser Wireside Communications® For NTT Research +1-804-500-6660 ngibiser@wireside.com |