Paper 2025/275 Original: eprint.iacr.org/2025/275 ↗
Error-Simulatable Sanitization for TFHE and Applications
Abstract
We show that the randomized TFHE bootstrapping technique of Bourse and Izabechéne provides a form of sanitization which is error-simulatable. This means that the randomized bootstrap can be used not only for sanitization of ciphertexts (i.e. to hide the function that has been computed), but that it can also be used in server-assisted threshold decryption. Thus we extend the server-assisted threshold decryption method of Passelégue and Stehlé (ASIACRYPT '24) to FHE schemes which have small ciphertext modulus (such as TFHE). In addition the error-simulatable sanitization enables us to obtain FuncCPA security for TFHE essentially for free.
Metadata
- Available format(s)
PDF- Category
- Cryptographic protocols
- Publication info
- Preprint.
- History
- 2025-02-18: last updated
- 2025-02-18: published
- Short URL
- https://ia.cr/2025/275
- License
- https://creativecommons.org/licenses/by-sa/4.0/
BibTeX
@misc{cryptoeprint:2025/275,
author = {Nigel P. Smart and Michael Walter},
title = {Error-Simulatable Sanitization for TFHE and Applications},
howpublished = {Cryptology {ePrint} Archive, Paper 2025/275},
year = {2025},
url = {https://eprint.iacr.org/2025/275}
}