Module sunscreen_backend::noise_model

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Expand description

A module for performing noise estimation on FHE programs.

Structs

CanonicalEmbeddingNormModel
A model for tracking noise growth using derivations of the canonical embedding norm of ciphertexts’ randomness as an upper bound.
MeasuredModel
A “model” that tracks noise growth in an FHE program just running it, measuring the noise of the output ciphertexts.

Enums

TargetNoiseLevel
How the MeasuredModel should create ciphertexts for each input to the FHE program.

Constants

NOISE_MAX
The maximum noise SEAL can introduce into a ciphertext during encryption.
NOISE_NUM_STD_DEVIATIONS
The number of standard deviations for which SEAL can choose noise.
NOISE_STD_DEV
The standard deviation of the Gaussian noise introduced when encrypting ciphertexts.

Traits

NoiseModel
A model for predicting noise growth in an FHE program.

Functions

create_ciphertext_with_noise_level
Creates a ciphertext with a noise level according to the given TargetNoiseLevel specification.
noise_budget_to_noise
Calculates the invariant noise from the given invariant noise budget.
noise_to_noise_budget
Calculates the invariant noise budget from the given invariant noise.
predict_noise
Returns the predicted noise levels in output ciphertexts for the given FheProgram.