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Signatures you can still trust years from now.

Perennis is Latin for “lasting”. We built it so that documents signed today can still be trusted when the cryptography they were signed with has aged.

Why we built it

Contracts, deeds and other records are signed today and relied on for decades. Their signatures were designed for a world without powerful quantum computers. Perennis adds a quantum-safe signature that today’s software still accepts, and a check that shows if anyone removes it.

How we work

  • We publish the method. It is described in a peer-reviewed, open-access paper, so anyone can check it for themselves.
  • We measure before we claim. Every result on this site comes from a check we can repeat in front of you.
  • We say what is not done yet. Next to every result, we show what is still ahead.

Founder

Rumen Doynov

Rumen Doynov designed and built Perennis: the quantum-safe signature, the signing platform and the check. Rumen is the first author of the peer-reviewed paper that describes the method. Based in Sofia, Bulgaria.

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Technical briefing · 30 minutes

See the problem on a real signed document.

An online session on our platform: we take a document signed on it, tamper with it three ways, and show what your current validator says next to what Perennis says. Then we look at how the quantum-safe signature fits your PAdES process.

Book a technical briefing Try the lab

Or write directly: contact@perennistrust.eu

  1. 0–5 minWhere the problem sits in your systems
  2. 5–20 minA signed document, three tampers, both results
  3. 20–30 minHow to integrate it, and a pilot plan