Struct ToyLwe 

pub struct ToyLwe {
    pub n: usize,
    pub q: u64,
    pub error_bound: u64,
}

Lattice-based encryption toy model.

Implements a toy version of LWE encryption for educational illustration. Uses very small parameters (NOT secure).

WARNING

This is an educational toy. Parameters are not cryptographically secure.

Fields

n: usize

Dimension n (key length)

q: u64

Modulus q

error_bound: u64

Error bound (max absolute value of noise)

Implementations

impl ToyLwe

pub fn new(n: usize, q: u64, error_bound: u64) -> Self

Create a new LWE context with given parameters.

pub fn inner_product(&self, a: &[u64], s: &[u64]) -> u64

Compute (a · s) mod q, the inner product of a and s.

pub fn encrypt_bit( &self, secret: &[u64], bit: u8, noise: u64, a: &[u64], ) -> (Vec<u64>, u64)

Encrypt a bit (0 or 1) using the LWE public key (A, b = As + e).

Returns (u, v) where u = A^T r, v = b^T r + bit * floor(q/2). For simplicity in this toy version, just uses the scalar version.

pub fn decrypt_bit(&self, secret: &[u64], a: &[u64], v: u64) -> u8

Decrypt: compute v - a · s mod q, return 0 or 1.