Rust and Cryptography - An In-Depth Guide |

Rust and Cryptography - An In-Depth Guide

Since its inception in 2010 by Graydon Hoare, Rust has gained significant traction in the systems programming world due to its remarkable blend of safety and efficiency. This powerful language has become an essential tool for cryptographers.

What is Rust?

Rust is a multi-paradigm programming language that focuses on performance and safety, especially safe concurrency. Rust follows a zero-cost abstraction principle, which means that you do not have to compromise on execution speed or binary size for its high-level language features..

In Rust, the possibilities for memory corruption or security flaws are dramatically minimized due to its strict compiler and memory model.

What is Cryptography?

Cryptography, in essence, is a practice of securing communication in the presence of adversaries. In layman's terms, it represents methods of storing and transmitting data in a particular form so that only those for whom it is intended can read and process it.

Cryptography doesn't solely entail encryption and decryption but also encompasses secure key exchanges, digital signatures, hash functions, and much more.

Why Use Rust in Cryptography?

Many cryptographic libraries out there are designed using lower-level languages like C, which, due to their inherent trivial vulnerabilities, are often prone to attacks. These vulnerabilities essentially stem from unchecked operations and insufficient type safety.

However, Rust employs a robust and strict compiler coupled with a well-thought-out memory model, making it nearly impossible to leave unchecked errors or vulnerabilities in your code.

Andrew Poelstra, a mathematician at Bitcoin-focused company Blockstream, even went as far as stating that "Rust and cryptographers seem made for each other."

What are the Benefits of Using Rust in Cryptography?


As mentioned earlier, one key property of Rust is memory safety without garbage collection. Rust's excellent memory management strategy makes it safe from bugs that often lead to security vulnerabilities like out-of-bounds errors and memory leaks.

Concurrent & Practical

The language has built-in concurrency support with comfortable syntax and minimal runtime. Being a system programming language, Rust provides a low-level control mechanism to handle system calls, GPU management, and cryptography.


Rust is a free and open-source language that has vast community support brimming with libraries and tools. Libraries such as rust-crypto and ring, make it easier to get started with cryptography in Rust.


Rust provides interoperability by allowing integration with existing C libraries without the need to change the source code. This feature opens up new possibilities to enhance the already existing cryptographic libraries in C with Rust.

How Can You Implement Cryptography in Rust?

You can start implementing cryptography in Rust using libraries like RustCrypto or ring. Both libraries are well-maintained and focus on different aspects of cryptographic tools.

Let's see an example with RustCrypto's AES - a symmetric cryptographic block cipher algorithm:

use aes::Aes128;
use block_cipher::NewBlockCipher;
fn main() {
    let key = GenericArray::from_slice(b"an example veryf");
    let cipher = Aes128::new(&key);

In this example, we initialized a new Aes128 block cipher with the given key.

Common Questions About Rust and Cryptography

1. Is Rust good for cryptography?

Yes, Rust is excellent for cryptography. Its emphasis on safety and robust memory model, coupled with the ease of crafting efficient and concurrent programs, makes Rust an ideal choice for creating cryptographic solutions.

2. Are there any famous projects using Rust for Cryptography?

Yes, significant projects are using Rust for cryptography. Some of these include Zcash,( a cryptocurrency) Tor, (a network browser) and Signal, (a messaging app).

3. What cryptographic libraries exist for Rust?

Some well-known cryptography libraries for Rust include: ring, which provides a broad set of well-reviewed cryptographic primitive algorithms, and RustCrypto, a collection of cryptography libraries written in Rust.

4. Is Rust faster than C?

Rust performs on par with C and C++ in most cases. However, Rust's main selling point is not speed, but rather its memory safety and avoidance of common programming flaws found in C and C++ that often lead to serious vulnerabilities.


Rust, because of its strict syntax, robust compiler, and memory model, is a well-suited language for cryptography. With its solid benefits including security, efficiency, memory safety, and the potential for high performance, Rust is deemed as an excellent choice for cryptographic operations at the forefront of secure systems programming.

The choice to use Rust in any cryptographic system can prove to be a turning point in software security, potentially ruling out entire classes of vulnerabilities that have plagued software systems for decades.

From all the developers and cryptography enthusiasts out there, let's get Rust-y!