We build high-tech secure communication systems based on the national cryptographic standards of Ukraine (DSTU).
Our own cryptographic engine. No third-party cryptographic libraries.
«Thank God, who made everything needful simple, and everything difficult needless.»
— Hryhorii Skovoroda
We follow this principle literally. No frameworks, no third-party libraries, no advertising, no analytics. Only mathematics.
We are a small software company in Prague. We were once part of a large engineering school in Kyiv: we developed hardware and software for secure government communications, and systems for analysing communication channels — GSM, VHF, microwave and satellite links. Our designs from the early 2000s are still in service in Ukraine and friendly countries.
The war brought its own corrections — we now work from the Czech Republic. But decades of experience in cryptography and the protection of state secrets travelled with us. We know how communications are intercepted — which is why we know how to protect them.
An end-to-end encrypted messenger built entirely on Ukrainian cryptographic standards. No accounts, no phone numbers, no data stored on the server. Web version live; native iOS app on the way.
Our own implementation of the Ukrainian national cryptography suite — Kalyna, Kupyna, DSTU 4145 and Edwards-curve key exchange — written over decades by our engineers. A 224-kilobyte core that compiles to WebAssembly and native ARM64 with byte-exact parity.
We build on the national cryptographic standards of Ukraine (DSTU) — approved for the protection of state information. Precise, verifiable, no marketing inflation.
The whole client is about 430 kilobytes. No frameworks, no CDNs, no analytics, no trackers. Every byte that ships is a byte we wrote and can answer for.
We publish exactly what our relay can and cannot see. Security claims you can check are worth more than superlatives you have to trust.
Whether you want to try SKLO, license the cryptographic engine, or discuss a secure-communications project — we answer personally.
