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TFHE-rs v1.0 January 2025

Summary

TFHE-rs v1.0.0 marks the first official stable release of the TFHE-rs library.

TFHE-rs v1.0.0 stabilizes the high-level API for the x86 CPU backend and introduces new parameters for the classic PBS with an error probability lower than $2^{-128}$.

This milestone release empowers developers with robust, performant, and user-friendly cryptographic primitives—ensuring greater reliability and efficiency for secure computations.

See full details below:

Breaking Changes

  • The trait HlCompactable is now required for types used in a CompactCiphertextList

  • GpuIndex has been refactored and its internal field is no longer public. Use new and try_new to create a GpuIndex

  • Conformance parameters names have been updated and now follow the "StructConformanceParam" naming schemer for a given Struct

CPU

New features

  • Add a modulus switch noise reduction technique, greatly improving performance for low error probabilities.

  • Add Abs to the high-level C API binding

  • Add a named implementation for integer compression/decompression, allowing safe serialization

  • Make strings compatible with the compact and compressed lists

  • Add parameters for the classic PBS in shortint with a probability of failure less than 2^-128

Improvements

  • Use destructuring in more places to ensure exhaustive field checks in some parts of the API

Fixes

  • Fix deserialization of old structures, which were renamed but still supported

  • Fix compression, which was crashing if output compute parameters were Multi Bit

  • Fix decompression of ciphertext lists after a safe deserialization for various device selections

  • Fix that trivial ciphertexts were crashing compression due to an invalid noise check

  • Fix rotations/shifts on less than 2 blocks

GPU

New features

  • Add encrypted Pseudo Random Generation

  • Add GPU selection in high-level API

Improvements

  • Optimized packing keyswitch

  • GpuIndex now enforces a validity invariant at creation time

  • Enable more samples in the keyswitch

  • Enable more samples in PBS (TBC variant)

Fixes

  • Fix corner cases in match value function

  • Fix scalar mul with 1 block

  • Fix internal indices for multi-GPU contexts

  • Fix some noise/degree bugs

  • Fix degree after shift/rotate

  • Fix wrong degree in ciphertexts after decompression, which led to degraded performance

  • Fix compressed ciphertext lists conversions between CPU and GPU

Resources

PreviousTFHE-rs v1.1 - April 2025

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