How to Use RSA Encryption in Rust

Use the rsa crate to generate keys and encrypt data in Rust. Add rsa = "0.9" to your Cargo.toml dependencies, then use RsaPrivateKey to generate keys and encrypt/decrypt methods to process data.

use rsa::{RsaPrivateKey, Oaep};
use rsa::rand_core::OsRng;

fn main() {
    let mut rng = OsRng;
    let bits = 2048;
    let private_key = RsaPrivateKey::new(&mut rng, bits).unwrap();
    let public_key = private_key.to_public_key();
    let message = b"Hello, Rust!";
    let padding = Oaep::new::<sha2::Sha256>();
    let encrypted = public_key.encrypt(&mut rng, padding.clone(), message).unwrap();
    let decrypted = private_key.decrypt(padding, &encrypted).unwrap();
    println!("Decrypted: {}", String::from_utf8_lossy(&decrypted));
}

RSA encryption is a way to scramble data so only someone with a specific key can read it. You use one key to lock the message and a different key to unlock it, ensuring secure communication. Think of it like a special padlock where anyone can lock the box, but only you have the key to open it.