Class DiscreteGaussianGeneratorGeneric

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Class Documentation

class lbcrypto::DiscreteGaussianGeneratorGeneric

The class for Generic Discrete Gaussion Distribution generator.

Public Functions

DiscreteGaussianGeneratorGeneric(BaseSampler **samplers, const double std, const int b, double N)

Basic constructor which does the precomputations.

Parameters

  • samplers – Array containing the base samplers

  • std – Standard deviation of the base samplers

  • b – Log of number of centers that are used for calculating base samplers (Recall that base samplers are centered from 0 to (2^b-1)/2^b)

  • N – smoothing parameter

DiscreteGaussianGeneratorGeneric(const DiscreteGaussianGeneratorGeneric&) = delete
DiscreteGaussianGeneratorGeneric &operator=(const DiscreteGaussianGeneratorGeneric&) = delete
int64_t GenerateInteger(double mean, double std)

Returns a generated integer. Uses generic algorithm in UCSD paper, based on Sample Z.

Parameters

  • mean – Mean of the distribution

  • std – Standard deviation of the desired distribution

Returns

A random value within the Discrete Gaussian Distribution

inline int64_t GenerateInteger()

Returns a sample from the first base sampler (center 0), bypassing the generic combination step.

Returns

A random value within the Discrete Gaussian Distribution of the first base sampler

~DiscreteGaussianGeneratorGeneric()

Destructor.