By AY Tanoli, · 3 June 2026 · 3 min read · 0 words
Quantum computers pose an existential threat to current cryptographic standards. Shor's algorithm can factor large primes exponentially faster than classical computers, breaking RSA and ECC encryption that underpins much of today's internet security. While large-scale quantum computers are not yet operational, NIST has been standardising post-quantum cryptographic algorithms to prepare for the transition.
In a post-quantum world, password-based authentication will become even more critical as traditional asymmetric cryptography may no longer be trusted to protect credential exchanges. 1Password is actively preparing for the quantum transition by implementing hybrid cryptographic schemes that combine classical and post-quantum algorithms, ensuring your password vault remains secure regardless of the computing landscape.
For decades, the security of passwords, encrypted messages, and online transactions has rested on a simple assumption: certain mathematical problems are too hard for computers to solve in any reasonable amount of time. Algorithms like RSA and elliptic-curve cryptography (ECC) depend on the difficulty of factoring large numbers or computing discrete logarithms. A classical computer would need billions of years to break a well-chosen RSA-2048 key. Quantum computers change that equation entirely.
Using Shor's algorithm, a sufficiently powerful quantum computer could factor those same numbers exponentially faster, collapsing protections that currently take millennia into a matter of hours. While large-scale, fault-tolerant quantum machines do not yet exist in 2026, the trajectory is clear enough that security professionals are already preparing for a post-quantum world.
Why "Harvest Now, Decrypt Later" Matters Today
You might assume quantum risk is a problem for the distant future, but the threat is immediate for one critical reason: adversaries can capture encrypted data now and decrypt it once quantum hardware matures. This strategy, known as "harvest now, decrypt later," means that any sensitive information transmitted today could be exposed years from now.
The data most at risk includes:
Long-lived credentials such as root passwords, API keys, and recovery codes that rarely change.
Encrypted backups containing financial records, health data, or intellectual property.
Stored password databases where the underlying encryption could later be unwound.
Government and corporate secrets with decades-long confidentiality requirements.
This is why organizations handling sensitive long-term data cannot afford to wait for quantum computers to arrive before acting.
How Passwords Fit Into the Quantum Equation
It is important to understand that quantum computing does not break passwords in the way many people imagine. A strong, randomly generated password is not "factored" the way an RSA key is. Instead, the quantum threat to passwords comes through a different algorithm: Grover's algorithm, which offers a quadratic speedup for brute-force searches.
In practical terms, Grover's algorithm effectively halves the security strength of a symmetric key or hashed password. A 128-bit security level becomes roughly equivalent to 64 bits of protection against a quantum attacker. The good news is that this weakness is easy to counter: simply doubling the length and entropy of your secrets restores the original margin of safety. A 256-bit key remains robust even against a fully realized quantum adversary.
NIST's Post-Quantum Standards
The transition to quantum-resistant cryptography is already underway. In 2024, the U.S. National Institute of Standards and Technology (NIST) finalized its first post-quantum cryptography standards, and adoption has accelerated through 2026. The flagship algorithms include:
ML-KEM (CRYSTALS-Kyber) for key encapsulation and secure key exchange.
ML-DSA (CRYSTALS-Dilithium) for digital signatures.
SLH-DSA (SPHINCS+) as a hash-based signature alternative.
These algorithms rely on mathematical problems—such as those based on structured lattices—that are believed to resist both classical and quantum attacks. Major browsers, messaging apps, and cloud providers have begun deploying hybrid schemes that combine traditional and post-quantum algorithms during this transitional period.
Practical Steps to Protect Your Passwords Now
You do not need a quantum computer or a cryptography degree to start defending against quantum risk. The most effective measures are the same fundamentals that protect against today's threats, applied with greater rigor:
Generate longer, higher-entropy passwords. Use a trusted random generator to create credentials of 20 characters or more, ensuring ample security margin against Grover-style attacks.
Adopt a reputable password manager that supports modern, strong encryption and can store unique credentials for every account.
Enable multi-factor authentication everywhere, ideally with hardware security keys that add a layer quantum computing cannot easily bypass.
Rotate long-lived secrets like API keys and recovery codes, shortening the window in which harvested data remains useful.
Favor services that have announced post-quantum migration plans, signaling a forward-looking security posture.
Preparing for a Quantum-Safe Future
The shift to post-quantum cryptography represents one of the largest security migrations in computing history, and it will unfold gradually over the coming years. While the heaviest lifting falls on protocol designers and platform engineers, individual users play a vital role by practicing strong password hygiene today. By generating robust, lengthy credentials and embracing quantum-resistant tools as they become available, you ensure that the secrets you create now remain safe long after quantum computers arrive.
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Why Post-Quantum Cryptography Matters for Passwords in 2026
The arrival of cryptographically relevant quantum computers threatens the asymmetric algorithms that protect authentication today. While password hashing itself relies on symmetric primitives, the channels and tokens surrounding your credentials—TLS handshakes, session keys, and signed authentication assertions—depend on RSA and elliptic-curve cryptography that Shor's algorithm can break. In 2026, organizations are racing to adopt NIST's standardized post-quantum schemes before "harvest now, decrypt later" attacks expose archived password databases and intercepted login traffic.
Quantum Threats to Stored Credentials
Grover's algorithm offers a quadratic speedup against symmetric brute-force attacks, effectively halving the security strength of a hash. A password protected by a 128-bit equivalent could see its effective security drop to 64 bits against a quantum adversary. The practical defenses are clear and achievable today:
Increase entropy by using passphrases of 16 or more characters to offset Grover's speedup.
Adopt memory-hard hashing functions like Argon2id, which resist parallelized quantum and GPU attacks.
Apply high iteration counts and unique salts to every stored credential.
Migrate legacy MD5 and SHA-1 hashes to modern, quantum-resistant configurations.
Migrating to NIST Post-Quantum Standards
NIST finalized its first post-quantum standards, including ML-KEM (CRYSTALS-Kyber) for key encapsulation and ML-DSA (CRYSTALS-Dilithium) for digital signatures. Authentication systems should integrate these into hybrid TLS configurations that combine classical and quantum-safe key exchange, ensuring backward compatibility while hardening forward secrecy.
Practical Steps for 2026 Password Security
Deploy hybrid certificates that pair ECDSA with ML-DSA signatures during the transition window.
Enforce phishing-resistant passkeys and FIDO2 hardware tokens to reduce reliance on passwords entirely.
Audit your cryptographic inventory to locate every algorithm that needs replacement.
Rotate long-lived secrets and re-encrypt archived data under quantum-safe keys.
By acting now, security teams ensure that today's credentials remain protected long after quantum hardware matures into a genuine threat.