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Yu-Fei Zhou

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2026

How to Watermark the RLWE Homomorphic Ciphertexts

A watermarking technique is proposed for RLWE-based HE ciphertexts using the roots of a linear equation and is resilient to both homomorphic additive and multiplicative operations, while supporting zero-bit watermarking.

Yu-Fei Zhou · 0 citations
Jul 2026

NFSA: Non-Forward Secure Aggregation with One Server via Two Layer Secret Sharing

A novel secure aggregation protocol based on two-layer secret sharing based on Shamir's Secret Sharing with 2-out-of-2 additive secret sharing using a Pseudo-Random Function (PRF) is proposed, enabling one-shot secure aggregation with a single server and no intermediary data forwarding.

Yu-Fei Zhou · 0 citations
Preprint Jul 2026

Ciphertext-Native Watermarking for RLWE-Based Homomorphic Encryption

This work proposes a watermarking technique for RLWE-based HE ciphertexts by exploiting the algebraic structure of RLWE polynomials and introduces two practical schemes that preserve the original security of HE while maintaining correctness and watermark robustness.

Yufei Zhou, Peijia Zheng · 0 citations

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