Why does post-quantum cryptography matter?

The transition has to happen before a quantum computer big enough to run Shor's exists — not after. Governments and banks are already required to migrate to PQC by 2030 or earlier. 'Harvest now, decrypt later' means today's sensitive data is already at risk. PQC standards are set. The task now is deployment — every browser, every VPN, every chip.

Lattices Are The Big Idea

Most PQC schemes are based on hard problems in high-dimensional lattices.

Google Already Ships PQC In Chrome

Chrome and Cloudflare have deployed Kyber for TLS handshakes since 2023.

Signal Encrypted Chats Went PQC

Signal's PQXDH protocol adds a post-quantum layer to end-to-end messaging.

It's Not Quantum Cryptography

PQC is classical math designed to resist quantum attackers — different from QKD.

Concepts

Concept / Post-Quantum Cryptography

Post-Quantum Cryptography.

The new encryption designed to survive a quantum computer.

Post-Quantum Cryptography (PQC) is a new generation of encryption designed to withstand attacks by future quantum computers. Once a large enough quantum machine exists, Shor's algorithm can break RSA and elliptic-curve cryptography — the backbone of internet security. PQC replaces those with problems even a quantum computer can't crack fast.

NIST Picked The Winners In 2024

Kyber, Dilithium, Falcon, and SPHINCS+ are the new standards.

In plain English.

Almost every secure connection online today — banking, email, chats — leans on math that a quantum computer will one day snap in half.

Attackers don't have to wait: they can steal encrypted data now and decrypt it later. This is called 'harvest now, decrypt later.'

Post-quantum cryptography swaps in new mathematical foundations — lattices, hashes, codes — that resist both classical and quantum attackers.

Why it matters.

The transition has to happen before a quantum computer big enough to run Shor's exists — not after.
Governments and banks are already required to migrate to PQC by 2030 or earlier.
'Harvest now, decrypt later' means today's sensitive data is already at risk.
PQC standards are set. The task now is deployment — every browser, every VPN, every chip.

Timeline — past and future.

What already happened, and what's next for post-quantum cryptography.

1994
Shor's algorithm — the reason PQC exists.
2016
NIST begins its PQC standardization competition.
2022
NIST announces first PQC winners: Kyber, Dilithium, Falcon, SPHINCS+.
2023
Chrome and Signal deploy hybrid PQC in production.
2024
NIST publishes the final FIPS PQC standards.
2030Forecast
Federal agencies required to complete PQC migration.
2035Forecast
RSA and ECC formally deprecated across the internet.

Where it shows up.

TLS / HTTPS

Every secure website is being upgraded to PQC key exchange.

Digital signatures

Signed software updates and certificates need to survive quantum.

Government secrets

Long-term classified data is already being re-encrypted with PQC.

Blockchains

Crypto wallets and chains are studying PQC signature schemes.

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