Module sunscreen_backend::noise_model

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.