NTT Researchers Contribute 17 Papers to Eurocrypt 2026

NTT Research and NTT R&D findings establish a foundation for next-generation digital privacy and security News Highlights: 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: 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. 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: 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. 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