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Post-Quantum
Techstars '15London, GB · Founded 2009 · 8 employees on LinkedIn · 5 known investors
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Post-Quantum develops quantum-safe cryptographic solutions and standards for protecting sensitive communications and critical infrastructure against quantum computing threats. The company serves government, defense, and enterprise organizations worldwide with production-ready technologies used in NATO communications and critical infrastructure protection.
Also known as Post-Quantum Solutions
Investors · 5
How we know: Outrun Ventures's portfolio page · Not right? Tell us
How we know: Runa Capital's portfolio page · Not right? Tell us
How we know: the Techstars portfolio · open dataset · Top 3000 Accelerator Startups (no YC) 2026-08 · Not right? Tell us
How we know: funding news · Not right? Tell us
How we know: funding news · Not right? Tell us
Company profile
researched Sep 2026Post-Quantum is a London-based cyber security company, operating since 2009, that develops quantum-safe cryptographic technology intended to protect communications and critical infrastructure against both current attacks and future attacks from cryptographically relevant quantum computers. Its positioning centres on "harvest now, decrypt later" risk, in which encrypted traffic captured today could be decrypted once sufficiently capable quantum computers exist, and on the multi-year timelines organisations need to complete cryptographic migrations.
The company's offering spans quantum-safe algorithms, standards work and migration services. It is associated with Classic McEliece, a code-based algorithm described as a NIST Round 4 finalist with a long-standing security track record, and it authored RFC9370, the IETF-ratified standard for hybrid quantum-safe VPN connectivity aimed at interoperability across heterogeneous environments. Its architecture is described as modular to support crypto-agility as standards change, and its hybrid approach allows classical and quantum-resistant encryption to run in parallel during transition. Alongside product, the company provides cryptographer and security-architect support covering cryptographic inventory, risk assessment, implementation and monitoring.
Deployments cited by the company include multi-year work protecting NATO alliance communications through the NATO Cyber Security Centre, and a partnership with STV Group providing quantum-safe communications for drones operating in active conflict zones.
Business model
Supplies quantum-safe cryptographic technology and platform components to organisations, combined with advisory and migration services delivered by in-house cryptographers and security architects covering inventory, risk assessment, implementation and monitoring.
Traction
Cited users and partners include the NATO Cyber Security Centre, under a multi-year deployment, and STV Group, whose CEO is quoted describing the platform's role in defence solutions; the site also references financial institutions and government agencies.
Latest developments
The company describes a first-in-world deployment of quantum-safe communications for drones in active conflict zones through its partnership with STV Group, alongside an ongoing multi-year NATO deployment.
▸Full profile — market position, technology, go-to-market, geography, history
Market position
Positions itself as a long-standing specialist in post-quantum cryptography, citing more than 15 years working in the field, authorship of an IETF-ratified hybrid quantum-safe VPN standard, and production deployments rather than laboratory pilots.
Emphasises standards authorship (RFC9370), a conservative code-based algorithm with a long security history (Classic McEliece), crypto-agile modular architecture, and operational deployments in NATO environments and active conflict zones.
Technology
Quantum-resistant cryptography including Classic McEliece, a code-based algorithm identified as a NIST Round 4 finalist; hybrid quantum-safe VPN connectivity standardised in RFC9370, of which the company is the author; a modular architecture intended to allow rapid algorithm updates (crypto-agility); and a hybrid mode running classical and quantum-resistant encryption simultaneously to preserve continuity during migration.
Go-to-market
Government agencies, defence and alliance organisations, financial institutions and operators of critical infrastructure.
Geography
Operates from the United Kingdom, with deployments described in NATO environments and in active conflict zones through its STV partnership.
History
The company states it has been working on quantum-safe security since 2009, giving it more than 15 years of activity in post-quantum cryptography.
Compiled by commissioned research from 8 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Related companies · 10
Companies working in the same space as Post-Quantum.
Timeline · 3
launches, deals, and filingsThe company is the author of RFC9370, the IETF-ratified standard for hybrid quantum-safe VPN connectivity across heterogeneous environments.
Multi-year deployment of the company's quantum-safe technology to protect NATO alliance communications, with the NATO Cyber Security Centre cited as a user.
Post-Quantum's platform is used by STV Group to provide quantum-safe communications for drone operations in active conflict zones, described by the company as a first-in-world deployment.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
▸Research sources · 8
primary sources listed
- Post-Quantumpost-quantum.com · web
8 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Post-Quantum do?
- UK developer of quantum-safe cryptography for critical infrastructure, government and defence communications.
- Who are Post-Quantum's investors?
- Post-Quantum's investors include Outrun Ventures, Runa Capital, Techstars, Bessemer Venture Partners, Evolution Equity Partners.
- Where is Post-Quantum headquartered?
- Post-Quantum is headquartered in London, GB.