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FRAST: TFHE-Friendly Cipher Based on Random S-Boxes [PDF]
IACR Transactions on Symmetric CryptologyA transciphering framework, also known as hybrid homomorphic encryption, is a practical method of combining a homomorphic encryption (HE) scheme with a symmetric cipher in the client-server model to reduce computational and communication overload on the
Mingyu Cho +5 more
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Improved homomorphic evaluation for hash function based on TFHE
CybersecurityHomomorphic evaluation of hash functions offers a solution to the challenge of data integrity authentication in the context of homomorphic encryption. The earliest attempt to achieve homomorphic evaluation of SHA-256 hash function was proposed by Mella ...
Benqiang Wei, Xianhui Lu
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YATA: Yet Another TFHE Accelerator with Key Compression and Radix-8 NTT
Transactions on Cryptographic Hardware and Embedded SystemsThis paper introduces a silicon-proven ASIC accelerator, YATA, specifically designed for TFHE’s most demanding operation, the BlindRotate. The architecture tackles the main bottleneck in TFHE—massive memory bandwidth—by applying Key Compression to ...
Kotaro Matsuoka, Takashi Sato
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Faster Homomorphic Integer Computer
Transactions on Cryptographic Hardware and Embedded SystemsWe design a fully homomorphic encryption for moduli of the form bk with small b. Our construction asymptotically improves upon Kim [TCHES’25]: for fixed b, the multiplication latency decreases from O(k log k) to O(log k) while preserving amortized ...
Jaehyung Kim
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Privacy-Preserving Feature Selection with Fully Homomorphic Encryption
Algorithms, 2022 For the feature selection problem, we propose an efficient privacy-preserving algorithm. Let D, F, and C be data, feature, and class sets, respectively, where the feature value x(Fi) and the class label x(C) are given for each x∈D and Fi∈F. For a triple (
Shinji Ono +5 more
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FINAL bootstrap acceleration on FPGA using DSP-free constant-multiplier NTTs
Transactions on Cryptographic Hardware and Embedded SystemsThis work showcases Quatorze-bis, a state-of-the-art Number Theoretic Transform circuit for TFHE-like cryptosystems on FPGAs. It contains a novel modular multiplication design for modular multiplication with a constant for a constant modulus.
Jonas Bertels +2 more
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Multiplicative Integer Division over Integer-wise TFHE
Transactions on Cryptographic Hardware and Embedded SystemsThis paper proposes homomorphic multiplicative division algorithms over integer-wise TFHE. These algorithms compute an approximate reciprocal of the divisor and use it to evaluate division, based on Rodeheffer’s integer Newton- Raphson (NR) algorithm ...
Kotaro Matsuoka +2 more
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Decomposition of Large Look-Up Tables for Fast Homomorphic Evaluation
Transactions on Cryptographic Hardware and Embedded SystemsTFHE is one of the most promising scheme in the literature for an adoption of Fully Homomorphic Encryption (FHE) in practice. The core reason of its good performances is the powerful Programmable Bootstrapping (PBS) operation, that enables to ...
Sonia Belaïd +2 more
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Multi-Key Homomorphic Encryption Scheme with Multi-Output Programmable Bootstrapping
Mathematics, 2023 Multi-key Homomorphic Encryption (MKHE) scheme can homomorphically evaluate ciphertexts encrypted by different keys, which can effectively protect the privacy information of data holders in the joint computing of cloud services.
Lingwu Li, Ruwei Huang
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Transactions on Cryptographic Hardware and Embedded Systems, 2023 The functional bootstrap in FHEW/TFHE allows for fast table lookups on ciphertexts and is a powerful tool for privacy-preserving computations. However, the functional bootstrap suffers from two limitations: the negacyclic constraint of the lookup table (
Shihe Ma +4 more
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