This white paper explores the critical intersection of quantum computing and data security. As quantum computers threaten to break traditional encryption methods, we delve into the world of quantum cryptography and its potential to safeguard sensitive information.
Key takeaways include:
- Understanding the Threat: Gain insights into how quantum computing challenges current encryption practices.
- Building Quantum Resilience: Discover the principles of quantum cryptography and its role in securing data in the quantum age.
- Preparing for the Future: Learn practical steps your organization can take to adapt to this evolving landscape and develop future-proof data security strategies.
What Quantum Computing Actually Breaks
Traditional encryption leans on problems that are expensive for a classical computer to solve. RSA rests on the difficulty of factoring large prime numbers. Elliptic Curve Cryptography rests on a similar class of mathematical operation. Neither is impossible to break, only impractical within any useful timeframe, and that distinction is the whole basis of the security.
Quantum computers change the arithmetic rather than the problem. By exploiting superposition and entanglement they perform calculations in a fundamentally different way, which lets them attack those problems far faster using approaches such as Shor’s algorithm. The projection in the paper is concrete: a quantum computer of roughly 20,000 qubits could crack RSA-2048 in about 100 days, and that figure falls toward seconds as the technology matures.
Not Everything Is Equally Exposed
Symmetric encryption holds up better. AES is considerably more resistant to quantum attack than RSA or ECC, and larger key sizes such as 256 bits are expected to stay secure for substantially longer. Cryptographic hash functions such as SHA-256, used for data integrity and digital signatures, are similarly more resilient than asymmetric encryption, particularly at greater bit lengths.
The exposure is concentrated in a specific place. Digital signing and key wrapping depend heavily on asymmetric algorithms to secure communications and verify identity, which makes them among the first operations affected as quantum computing advances. An organization auditing its own cryptography should start there rather than with its bulk data encryption.
How the Hardware Is Being Built
Quantum computing replaces the classical bit, which holds one value at a time, with the qubit, which can represent multiple states simultaneously. Several approaches to building them are being pursued in parallel.
Superconducting qubits are the most advanced and most widely used in current research, built as tiny circuits from materials such as niobium and controlled with microwave pulses. Photonic approaches use particles of light as qubits, manipulated with beam splitters, mirrors, and detectors, with information encoded in properties such as polarization. Neutral atom machines trap individual atoms in magnetic or optical traps and encode qubits in their electronic states, operated on with laser pulses. Quantum dots trap individual electrons in semiconductor nanostructures and use their spin states. Other approaches use continuous variables such as the amplitude and phase of electromagnetic waves, and work continues on topological qubits and diamond defects such as nitrogen-vacancy centers.
What Is at Stake
The consequences of compromised encryption reach a long way. Financial transactions, personal information, and classified government communications could all be decrypted, which is why the question for most organizations is not whether their current encryption is adequate today but how long it stays adequate.