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updated ggsw product noise prediction & added test for ggsw x glwe of rank > 1

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This commit is contained in:
Jean-Philippe Bossuat
2025-05-14 16:57:57 +02:00
parent f517a730a3
commit 4c55a7df44
2 changed files with 62 additions and 57 deletions
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5
core/src/test_fft64/ggsw.rs
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@@ -576,6 +576,7 @@ pub(crate) fn noise_rgsw_product(
var_a1_err: f64,
var_gct_err_lhs: f64,
var_gct_err_rhs: f64,
rank: f64,
a_logq: usize,
b_logq: usize,
) -> f64 {
@@ -590,9 +591,9 @@ pub(crate) fn noise_rgsw_product(
// lhs = a_cols * n * (var_base * var_gct_err_lhs + var_e_a * var_msg * p^2)
// rhs = a_cols * n * var_base * var_gct_err_rhs * var_xs
let mut noise: f64 = 2.0 * (a_cols as f64) * n * var_base * (var_gct_err_lhs + var_xs * var_gct_err_rhs);
let mut noise: f64 = (rank + 1.0) * (a_cols as f64) * n * var_base * (var_gct_err_lhs + var_xs * var_gct_err_rhs);
noise += var_msg * var_a0_err * a_scale * a_scale * n;
noise += var_msg * var_a1_err * a_scale * a_scale * n * var_xs;
noise += var_msg * var_a1_err * a_scale * a_scale * n * var_xs * rank;
noise = noise.sqrt();
noise /= b_scale;
noise.log2().min(-1.0) // max noise is [-2^{-1}, 2^{-1}]