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test(core): use 5 bits parameters tweaked to 4 bits to avoid high pfail #1976

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Jan 17, 2025
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test(core): use 5 bits parameters tweaked to 4 bits to avoid high pfail #1976

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31 changes: 16 additions & 15 deletions tfhe/src/core_crypto/experimental/algorithms/test/lwe_fast_keyswitch.rs
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ pub struct FastKSParam<Scalar: UnsignedInteger> {
pub bsk_partial_glwe_secret_key_fill: PartialGlweSecretKeyRandomCoefCount,
pub bsk_glwe_noise_distribution: DynamicDistribution<Scalar>,
pub lwe_dimension: LweDimension,
pub ks1_lwe_modular_std_dev: DynamicDistribution<Scalar>,
pub ks1_lwe_modular_noise_distribution: DynamicDistribution<Scalar>,
pub pbs_level: DecompositionLevelCount,
pub pbs_base_log: DecompositionBaseLog,
pub ks1_level: DecompositionLevelCount,
Expand All @@ -25,27 +25,28 @@ pub struct FastKSParam<Scalar: UnsignedInteger> {
pub ciphertext_modulus: CiphertextModulus<Scalar>,
}

/// This is the original precision 5 parameters tweaked to use for 4 bits, such that the pfail is
/// much lower than 2^-14, it should be approximately ~2^-49
pub const PRECISION_4_FAST_KS: FastKSParam<u64> = FastKSParam {
log_precision: MessageModulusLog(4),
_log_mu: 4,
glwe_dimension: GlweDimension(2),
polynomial_size: PolynomialSize(1024),
log_precision: MessageModulusLog(4), // original: log_precision: 5,
_log_mu: 5,
glwe_dimension: GlweDimension(1),
polynomial_size: PolynomialSize(2048),
bsk_partial_glwe_secret_key_fill: PartialGlweSecretKeyRandomCoefCount(2048),
bsk_glwe_noise_distribution: DynamicDistribution::new_gaussian_from_std_dev(StandardDev(
3.162026630747649e-16,
)),
lwe_dimension: LweDimension(682),
ks1_lwe_modular_std_dev: DynamicDistribution::new_gaussian_from_std_dev(StandardDev(
2.7313997525878062e-5,
)),
lwe_dimension: LweDimension(766),
ks1_lwe_modular_noise_distribution: DynamicDistribution::new_gaussian_from_std_dev(
StandardDev(5.822_216_831_056_818e-6),
),
pbs_level: DecompositionLevelCount(1),
pbs_base_log: DecompositionBaseLog(23),
ks1_level: DecompositionLevelCount(14),
ks1_level: DecompositionLevelCount(15),
ks1_base_log: DecompositionBaseLog(1),
ks1_polynomial_size: PolynomialSize(512),
ks_in_glwe_dimension: GlweDimension(3), // Original value
// ks_in_glwe_dimension: GlweDimension(4), // Test non square pseudo GGSWs
phi_in: 1366,
ks_in_glwe_dimension: GlweDimension(3),
phi_in: 1282,
ks_out_glwe_dimension: GlweDimension(3),
ciphertext_modulus: CiphertextModulus::new_native(),
};
Expand All @@ -71,7 +72,7 @@ fn lwe_encrypt_fast_ks_decrypt_custom_mod<
bsk_partial_glwe_secret_key_fill,
bsk_glwe_noise_distribution,
lwe_dimension,
ks1_lwe_modular_std_dev,
ks1_lwe_modular_noise_distribution,
pbs_level,
pbs_base_log,
ks1_level,
Expand Down Expand Up @@ -222,7 +223,7 @@ fn lwe_encrypt_fast_ks_decrypt_custom_mod<
&small_glwe_secret_key,
&large_glwe_secret_key_unshared,
&mut ggsw,
ks1_lwe_modular_std_dev,
ks1_lwe_modular_noise_distribution,
&mut rsc.encryption_random_generator,
);

Expand Down
28 changes: 15 additions & 13 deletions tfhe/src/core_crypto/experimental/algorithms/test/lwe_stair_keyswitch.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -29,30 +29,32 @@ pub struct StairKSParam<Scalar: UnsignedInteger> {
pub ciphertext_modulus: CiphertextModulus<Scalar>,
}

/// This is the original precision 5 parameters tweaked to use for 4 bits, such that the pfail is
/// much lower than 2^-14, it should be approximately ~2^-49
pub const PRECISION_4_STAIR: StairKSParam<u64> = StairKSParam {
log_precision: MessageModulusLog(4),
_log_mu: 4,
glwe_dimension: GlweDimension(2),
polynomial_size: PolynomialSize(1024),
log_precision: MessageModulusLog(4), //original: log_precision: 5,
_log_mu: 5,
glwe_dimension: GlweDimension(1),
polynomial_size: PolynomialSize(2048),
partial_glwe_secret_key_fill: PartialGlweSecretKeyRandomCoefCount(2048),
bsk_glwe_noise_distribution: DynamicDistribution::new_gaussian_from_std_dev(StandardDev(
3.16202663074765e-16,
)),
lwe_dimension: LweDimension(664),
lwe_dimension: LweDimension(732),
ks1_lwe_noise_distribution: DynamicDistribution::new_gaussian_from_std_dev(StandardDev(
7.60713313301797e-9,
3.31119701700870e-9,
)),
ks2_lwe_noise_distribution: DynamicDistribution::new_gaussian_from_std_dev(StandardDev(
0.0000380960250519291,
0.0000108646407745138,
)),
pbs_level: DecompositionLevelCount(1),
pbs_base_log: DecompositionBaseLog(22),
ks1_level: DecompositionLevelCount(1),
ks1_base_log: DecompositionBaseLog(13),
ks2_level: DecompositionLevelCount(6),
pbs_base_log: DecompositionBaseLog(23),
ks1_level: DecompositionLevelCount(2),
ks1_base_log: DecompositionBaseLog(9),
ks2_level: DecompositionLevelCount(7),
ks2_base_log: DecompositionBaseLog(2),
ks1_unshared_coeff_count: LweSecretKeyUnsharedCoefCount(922),
ks2_unshared_coeff_count: LweSecretKeyUnsharedCoefCount(462),
ks1_unshared_coeff_count: LweSecretKeyUnsharedCoefCount(877),
ks2_unshared_coeff_count: LweSecretKeyUnsharedCoefCount(439),
ciphertext_modulus: CiphertextModulus::new_native(),
};

Expand Down
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