QuStream derives keys by walking a secret path through quantum-random material — earning information-theoretic security in software, over the networks that already exist. These pages set out the theory against the alternatives, and show it at work across real deployments.
How QuStream compares, head to head, with the established answers to the quantum threat — what each approach rests on, what it costs, and where QuStream is the structurally stronger choice. Start with the protocol introduction, then the three comparisons.
An introduction to the protocol and its security model — nibble-bit key derivation, a self-ratcheting secret state, and layered confidentiality claims that each say exactly what they rest on.
Read the introduction →Two answers to the same quantum threat: post-quantum cryptography swaps broken mathematics for harder mathematics and keeps the TLS architecture; QuStream stops relying on the secrecy of mathematics at all. A side-by-side on security, key delivery, wire cost and scale.
Compare for SSL/TLS →QKD and QuStream both reach for security rooted in physics — by opposite routes. QKD sends single photons down dedicated fibre; QuStream consumes the quantum randomness once, in software, and spends it cleverly. Distance, rate, cost, and what actually deploys.
Physics vs fibre →PKI is the trust layer under almost everything — certificate authorities, chains and revocation that let strangers authenticate over an open network. Indispensable for the open web, awkward everywhere else. QuStream's provisioned trust, set beside it.
Trust and certificates →The protocol in the field — hardened profiles and product layers for the places ordinary cryptography struggles: contested spectrum, constrained devices, broadcast and one-to-many links, and long-lived infrastructure.
Under jamming and contested spectrum, standard tactical crypto cliffs — one flipped bit and an AEAD discards the whole command. QSDP is a true bit-stream cipher with single-use, information-theoretic keys that degrades gracefully instead of dying.
Defence protocol →An interactive simulation comparing QSDP against AES and post-quantum crypto across communication-contested channels — jamming, packet loss and bit errors — for unmanned vehicles across subsurface, ground, air and space.
Run the simulator →A software layer that turns reliability and security into tiers you can sell — working across the network you already run, with no new hardware to launch. The marginal link that used to fail is the moment QSSP is built to make work.
Satellite protocol →Post-quantum signatures and KEMs were built for servers, not a meter on a coin cell and a 50 kbps link. Q-Stream protects the steady-state path in firmware — kilobytes of state, a 16-byte tag, sub-millisecond compute — so the fleet goes quantum-safe with no hardware swap.
Metering upgrade →QKD's "unconditional security" lives at one optical link; the moment keys are exported, stored, relayed and reused across the estate, the promise quietly evaporates. Q-Stream QSN is the missing key-governance layer that carries the guarantee across the whole network.
Network key governance →Bitcoin, Ethereum and Solana authorise transactions with elliptic-curve keys a future quantum computer can reverse — and every public key ever revealed on-chain is permanent and one day forgeable. Q-Stream adds a quantum-safe authentication and encryption layer across the wallet.
Wallet & on-chain layer →