Quantum-proof encryption: Preparing for the future of cybersecurity

Quantum computing is poised to revolutionize the digital world as we know it. Unlike traditional computers that rely on binary bits (either 0 or 1), quantum computers use quantum bits — or qubits — which have the unique ability to represent both 0 and 1 simultaneously. This unparalleled processing power holds the potential to make even the most sophisticated encryption methods obsolete, with the capability of cracking complex passwords in mere milliseconds.

In response to this looming challenge, quantum-proof encryption, also known as post-quantum encryption, is rapidly emerging as a vital tool to protect sensitive information and fortify cybersecurity for the future.

So, what’s all the buzz about, and why should small businesses be paying close attention? Let’s explore why this shift in cybersecurity is more important than ever.

Understanding quantum computing and its threat to encryption

To understand why quantum computing presents such a significant risk, it’s important to grasp the fundamental difference between classical and quantum computers. 

• Classical computers operate linearly, meaning they handle one calculation at a time, albeit very quickly. 
• Quantum computers, however, leverage quantum superposition, which allows them to perform numerous calculations simultaneously.

This capability is especially concerning for current encryption methods. Many of the encryption techniques we use today, such as RSA (Rivest-Shamir-Adleman) and ECC (Elliptic Curve Cryptography), rely on mathematical problems that are extremely difficult to solve with classical computers. 

These encryption systems depend on the assumption that certain operations, like factoring large prime numbers, would take an impractically long time to break. Ever wondered why all password managers suggest 15-character passwords with all kinds of symbols? Here’s a visual representation of why: 

In an attempt to put a wrench in hackers’ plans, Shor’s algorithm was developed — a quantum algorithm that can efficiently solve the mathematical problems underlying RSA and ECC. 

This means that quantum computers, once sufficiently advanced, could easily decrypt data protected by these currently widespread methods. Criminals would be so efficient that you wouldn’t even know you were hacked!

As a result of such computational power becoming available, the scientific community has devoted the development of quantum-proof encryption techniques. But what does this entail? 

The concept of quantum-proof (post-quantum) encryption

Quantum-proof encryption refers to cryptographic algorithms designed to be secure against an attack by a quantum computer. 

Unlike current encryption methods that would be vulnerable to quantum-powered attacks, these new algorithms rely on mathematical problems that are resistant to quantum computation. This involves the SIS and LWE problems, as well as multivariate quadratic equations and hash functions. 

The most prominent algorithms are: 

• Lattice-based cryptography: It uses complex, high-dimensional structures known as lattices. A lattice can be visualized as a grid-like structure that extends into multiple dimensions, defined by linear combinations of basis vectors. The inherent difficulty of solving certain problems within these lattices, such as the Shortest Vector Problem (SVP) or the Learning With Errors (LWE) problem, remains formidable even for quantum computers. This complexity makes lattice-based cryptography a strong contender for future encryption standards, as it offers robust protection against quantum attacks.
• Hash-based signatures: They use the complexity of hash functions to ensure data integrity. Hash-based cryptography has a long history of theoretical reliability, making it a robust option for quantum-proof needs.
• Code-based cryptography: Another approach that utilizes error-correcting codes to secure data. Though it has been around for decades, code-based cryptography is experiencing renewed interest due to its resilience against quantum attacks. 

Each of these algorithms has its strengths and weaknesses, such as computational efficiency and key size, but the overarching goal is to develop systems that are resistant to quantum decryption.

NIST’s role in standardizing quantum-proof algorithms

The National Institute of Standards and Technology (NIST) plays a pivotal role in guiding the future of quantum-resistant encryption. NIST launched an initiative in 2016 to evaluate and standardize post-quantum cryptographic algorithms. It resulted in four main ones:

• CRYSTALS-Kyber: A key encapsulation mechanism for general encryption purposes.
• CRYSTALS-Dilithium: A digital signature scheme ensuring data authenticity. 
• FALCON: Another digital signature algorithm offering strong security guarantees. 
• SPHINCS+: A stateless hash-based digital signature scheme.

NIST’s selection process is rigorous, involving multiple rounds of evaluation by experts from across the world. The current progress in these evaluations suggests that quantum-proof encryption standards may be available within the next few years. 

However, this process is not without its challenges. Choosing a standard that offers security without compromising efficiency is difficult, given that post-quantum algorithms often require more computational power and storage compared to current methods.

Preparing current systems for quantum resistance

The reality of quantum computing is still a few years away, but organizations must start preparing now. A key strategy for staying ahead is embracing cryptographic agility. 

Cryptographic agility means designing systems that can easily switch to new cryptographic algorithms as they become available. If they integrate flexibility into security frameworks today, organizations can adopt quantum-proof encryption without the need for a complete overhaul.

Another approach is using hybrid cryptographic schemes. These combine classical encryption algorithms, like RSA, with post-quantum algorithms. Hybrid schemes are an effective way to transition because they provide quantum resistance while maintaining compatibility with current systems. 

Experiments can thus be conducted on everything from QR code generators churning our data encoded in a quantum-resistant manner, impervious backend databases, and, of course, secure or classified-level networks. Some branches of the government are already exploring ways to utilize these ‘anti-quantum’ measures.  

Organizations must also consider the longevity of their data. Information that needs to remain secure for the next 10 to 20 years is particularly vulnerable, as quantum computers could emerge within that time frame. Developing a quantum-resistant plan now ensures that such data will remain protected in the future.

The future of encryption in a quantum world

As quantum computing technology matures, it will redefine many of the practices currently used in cybersecurity and upend organizations of all sizes. 

Encryption as we know it will have to evolve to meet the capabilities of quantum processors. Quantum-proof encryption will be at the core of securing digital communications, financial transactions, healthcare records, and countless other applications that require privacy and integrity.

Post-quantum cryptography is also expected to influence the security architecture of the Internet itself. Protocols that underpin secure web communications, such as TLS (Transport Layer Security), will need to incorporate quantum-resistant algorithms. Fortunately, quantum frontrunners like Microsoft, Meta, and IBM claim to have already achieved post-quantum readiness. 

The cybersecurity industry as a whole will need to adapt. Cryptographic best practices will continue to evolve, with a heightened emphasis on integrating quantum-proof solutions. Organizations that proactively invest in this transition will be better prepared to face the impending challenges posed by quantum computing.

The time to prepare is now

As quantum technology continues to develop, the risk it poses to current encryption methods grows more pressing. Quantum-proof encryption is not just an option but an essential evolution in our security practices. 

By preparing for this transition now — through adopting cryptographic agility, hybrid schemes, and new encryption standards — organizations can safeguard their data and maintain trust in a quantum-driven future. 

The time to act is today, as proactive measures will ensure that our digital communications remain secure in the face of rapidly advancing quantum capabilities.

Read more on the promise and risks of quantum computing and cybersecurity.