# OFHE: An Electro-Optical Accelerator for Discretized TFHE

arXiv: https://arxiv.org/abs/2405.11607 · HTML: https://mlsanity.com/paper/2405.11607/

## Key facts

- Cited by 2 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 19 May 2024.

## Built on by (most cited first, 2 of 2)

- [CipherPrune: Efficient and Scalable Private Transformer Inference](https://mlsanity.com/paper/2502.16782/) (2025)
- [TFHE-Coder: Evaluating LLM-agentic Fully Homomorphic Encryption Code Generation](https://mlsanity.com/paper/2503.12217/) (2025)

## Abstract (arXiv)

This paper presents textitOFHE, an electro-optical accelerator designed to process Discretized TFHE (DTFHE) operations, which encrypt multi-bit messages and support homomorphic multiplications, lookup table operations and full-domain functional bootstrappings. While DTFHE is more efficient and versatile than other fully homomorphic encryption schemes, it requires 32-, 64-, and 128-bit polynomial multiplications, which can be time-consuming. Existing TFHE accelerators are not easily upgradable to support DTFHE operations due to limited datapaths, a lack of datapath bit-width reconfigurability, and power inefficiencies when processing FFT and inverse FFT (IFFT) kernels. Compared to prior TFHE accelerators, OFHE addresses these challenges by improving the DTFHE operation latency by 8.7%, the DTFHE operation throughput by 57%, and the DTFHE operation throughput per Watt by 94%.