QuStream
Operational Perfect Secrecy for the data plane: one-time-pad encryption over any network, on existing hardware.
United States
- Headcount2 to 10
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How QSECDEF membership works →- TrainingTeam members take part in continuous training and skills updates with our team.
- VettedWe have high confidence in this team's capabilities and skills base.
- Provable claimsCommitment to transparent and technically correct communications to customers.
- QSECDEF ContributorCommunity contributor and presenter.
- Membership CharterHas signed the Members' Charter, committing to fair and transparent business practices.
- LeadershipAttends the QSECDEF Annual Symposium.
About QuStream
QuStream's mission is to establish Operational Perfect Secrecy (OPS) as the standard for digital certainty. Traditional encryption rests on computational assumptions, mathematical problems that are hard today and trivial for quantum computers. OPS, a formal generalisation of Shannon's 1949 perfect secrecy theorem, bounds an adversary's success probability independently of computing power, classical or quantum.
The platform deploys as a transparent overlay on the data plane. Master nodes generate authenticated public noise epochs (Q-Blocks) from QRNGs; each endpoint holds a secret ratchet state (DFK) that selects bits locally, derives a one-time message key, then refreshes itself. No keys travel over the network, and relay nodes hold no cryptographic state.
QuStream positions the system as complementary to PQC, which handles authentication and key negotiation, and as a way to extend QKD's information-theoretic security to the last mile. It can be added as a lightweight layer to existing systems or fully integrated, with no replacement of legacy equipment. Its research papers, including a February 2026 technical paper, are published on the site.
Reviewed 30 October 2026 Source: qustream.com/about
What they offer
QuStream Platform
Transparent data-plane overlay applying one-time-pad encryption with keys derived locally from authenticated public Q-Block epochs.
qustream.comLeast invasive add-on
Added as a layer to existing systems to raise security without disrupting operations.
qustream.comFull integration
Integrated into the client's environment for protection across all layers.
qustream.comTechnical briefing
Architecture fit, deployment requirements and reference architecture review with the QuStream team.
qustream.comResearch and publications
Technical papers on q-stream v2, Operational Perfect Secrecy and QKD last-mile delivery, each labelled with its publication status.
qustream.comWho they work with
People
Leadership as listed on qustream.com/team, checked 30 October 2026