Post-quantum cryptography meaning and context

Post-quantum cryptography

Post-quantum cryptography (PQC) refers to cryptographic algorithms designed to resist attacks from both conventional and sufficiently capable quantum computers. It includes different purposes, such as key establishment and digital signatures; the term does not mean every algorithm or system is invulnerable.

Also known as PQC.

Updated October 10, 2026

Why it matters in practice

Migration work must consider protocol support, key sizes, interoperability, implementation quality, and the data’s confidentiality horizon. Standardized algorithms address particular cryptographic problems rather than replacing all security controls. Teams should distinguish key-establishment mechanisms from signatures and avoid promising “unbreakable” encryption.

Example

An engineering team tests whether its client and service can negotiate a supported post-quantum key-establishment method before changing production protocols.

Educational note

This definition is general information, not legal advice. It may omit facts that matter to a specific situation and does not establish or guarantee compliance.