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Filip Rezabek

Germany

Co-Founder and CTO at SpaceComputer. TEE and distributed networking PhD researcher and Technical University of Munich (TUM) Alumni.

Image of the Earth from low earth orbit, highlighting the focus on the KMS architecture blog of our Earth-based KMS service, before offering on-orbit KMS once we launch our satellite in 2027.

From KMS to SpaceKMS: Building a Verifiable Cryptographic Control Plane

From confidential computing on Earth to independent trust domains in space Modern computing systems depend on cryptographic keys to determine who may sign, decrypt, authenticate, release secrets, provision infrastructure, or authorize high-value actions. A Key Management Service (KMS) is the control plane that governs those keys: where they may

graphic for the space threat model showing a landscape map of the Earth with analytical charts on the side.

Space Security: An End-to-End Threat Model for Space Systems

Asset or property What is being protected Command authority Who is allowed to issue which commands, under which conditions. Cryptographic identity and keys What establishes the identity of systems and workloads, and how secrets are protected. Runtime integrity Which platform software, firmware, containers, and workloads are executing. Execution and location

image of planet earth surrounded by rings of network lights of data packets in satellites that are communicating with each other.

SpaceComputer Mid-Year Updates 2026: Building the Fabric of the Space Internet

On June 12th 2026, SpaceX completed the largest initial public offering in history, entering the public markets at a valuation approaching $1.8 trillion. This historic IPO alone has lowered the barrier of capital inflows into the space industry significantly. We are about to enter a major space acceleration era!

Image of a secure element computing chip zoom-in from inside a satellite, for the partnership between Tropic Square and SpaceComputer using their TROPIC01 chip.

SpaceComputer Partners with Tropic Square: Open Security Hardware for Orbital Compute

We’re thrilled to announce that SpaceComputer and Tropic Square are entering a partnership. Tropic Square is a Prague-based semiconductor firm building the world's first open-source, auditable secure element (SE). Tropic Square's TROPIC01 chip is being integrated into our Space Fabric hardware design as

Image featuring Filip Rezabek, CTO of SpaceComputer in front of a locked satellite, with yellow and white text.

Filip Rezabek on Quantum Communications at SmallSat Europe

I'm Filip, one of the co-founders and CTO of SpaceComputer. And today I'll be talking about quantum communications. So it's a short overview of actually where we see the space heading with respect to quantum computing and how can we actually prepare for

Image of some cosmic dice made of connected data lines and stars above Earth, with the milky way in the background.

Ctrng-lib

In our previous post, we outlined the randomness supply chain and how we can ensure randomness is correctly generated and delivered to the user. But once the user has that randomness, along with proof that it hasn't been tampered with, how does he use it? That’s the

Image of data moving from land to orbit on satellites, and locked by the security of Orbitport

Making Orbitport Verifiable: Reproducible Builds, Docker Hardened Images, and Attested TLS

Introduction In our previous post, Orbitport: The Gateway to Space, we introduced Orbitport as SpaceComputer’s universal gateway between Earth and in-space infrastructure: a developer-friendly API layer that abstracts away ground-station scheduling, intermittent orbital connectivity, satellite-specific integrations, and the operational complexity of communicating with hardware in