Ghost-TFHE

A pure Rust implementation of TFHE (Torus Fully Homomorphic Encryption) for secure computation on encrypted data.

Features

• LWE (Learning With Errors) - Basic lattice-based encryption
• TLWE (Torus LWE) - Operations on the torus for improved efficiency
• TGSW (Torus GSW) - Bootstrapping operations
• TFHE - Complete fully homomorphic encryption scheme
• Homomorphic Operations - Boolean gates (AND, OR, XOR, NAND, NOT, MUX) and arithmetic

Quick Start

Add to your Cargo.toml:

[dependencies]
ghost-tfhe = "0.1.0"

Basic Example

use ghost_tfhe::tfhe::{TfheParams, TfheSecretKey, TfheEncoder};

fn main() {
    // Generate parameters and keys
    let params = TfheParams::default();
    let secret_key = TfheSecretKey::generate(params);

    // Encrypt boolean values
    let encrypted_true = TfheEncoder::encode_bool(true, &secret_key);
    let encrypted_false = TfheEncoder::encode_bool(false, &secret_key);

    // Decrypt and verify
    let decrypted_true = TfheEncoder::decode_bool(&encrypted_true, &secret_key);
    let decrypted_false = TfheEncoder::decode_bool(&encrypted_false, &secret_key);

    println!("true -> {}", decrypted_true);
    println!("false -> {}", decrypted_false);
}

Examples

Run the basic demo:

cargo run --example basic_tfhe

Architecture

• torus.rs - Torus arithmetic operations
• noise.rs - Noise management for security
• encoding.rs - Message encoding/decoding
• lwe.rs - LWE encryption primitives
• tlwe.rs - Torus LWE operations
• tgsw.rs - TGSW scheme for bootstrapping
• tfhe.rs - Main TFHE implementation
• operations.rs - Homomorphic operations

Security

This implementation uses lattice-based cryptography with configurable noise parameters for quantum-resistant security.

License

MIT