Yes, quantum computers will break widely-used encryption methods like RSA-2048 and ECC, but not immediately. Experts estimate we have 5-10 years before quantum systems pose a real threat. NIST predicts that by 2030, a sufficiently powerful quantum computer (requiring millions of qubits) could decrypt data protected by today’s standards. Current quantum computers have only achieved around 1,000 qubits, far short of the threshold needed.

How Will Quantum Computers Break Current Encryption?

Quantum computers leverage Shor’s algorithm to factor large numbers exponentially faster than classical computers. RSA encryption relies on the difficulty of factoring—a task that takes traditional computers centuries but could take quantum systems mere hours. IBM researchers estimate a quantum computer with 20 million qubits could crack RSA-2048 in eight hours. Symmetric encryption like AES-256 is more resistant but still vulnerable to Grover’s algorithm, requiring key size doubling for equivalent security.

When Should Organizations Start Preparing?

Now. NIST released post-quantum cryptography standards in 2024, recommending immediate migration planning. The “harvest now, decrypt later” threat means adversaries are already storing encrypted data to decrypt once quantum computers mature. Google and Apple have begun implementing quantum-resistant algorithms in their systems. Security experts recommend organizations inventory cryptographic assets and prioritize transitioning high-value, long-shelf-life data first.

What Are Post-Quantum Encryption Alternatives?

NIST standardized four quantum-resistant algorithms: CRYSTALS-Kyber for key exchange, and CRYSTALS-Dilithium, FALCON, and SPHINCS+ for digital signatures. These lattice-based and hash-based cryptographic methods resist both classical and quantum attacks. Major tech companies are already integrating these standards into TLS protocols and secure communications platforms.