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@a-sit-plus

A-SIT Plus GmbH

a-sit-plus
Austria

We build production-grade security & identity tech for the public good using open-source software.
On GitHub, we develop and maintain libraries and tooling you can run in the real world—mostly in Kotlin Multiplatform—so everyone can build safer systems faster.

Important

Sponsorship ≠ endorsement!
We’re greteful for community support, but sponsorship does not imply our endorsement of any sponsor’s activities, products, or views. We reserve the right to end sponsorship we consider harmful or a conflict of interest. If sponsorship misrepresents our work or values, we may block the sponsoring account, decline sponsorship and redirect an equivalent amount to charity at our discretion.
Because of this, we cannot automatically list past sponsors.

Why sponsor us

Open source keeps critical security infrastructure moving—but maintenance, reviews, and upstreaming don’t fund themselves. Your sponsorship helps us:

  • Maintain and evolve core crypto & PKI libraries applied in real systems, and usable for research.
  • Advance multiplatform-first EU digital identity wallet libraries and verifiable credentials (W3C VC, SD-JWT, ISO 18013-5).
  • Prototype identity wallets to explore UX and interoperability for the EUDIW future.
  • Help everyone harden mobile app security through attestation.
  • Do applied research and experiments—and fold what works back into the open parts.

Tip

We serve both public institutions and private enterprises and publish as much as we can under permissive licenses.
→ Sponsoring lets us spend more time on the open parts—docs, tests, examples, and upstreaming.

What your support powers

  • Security reviews & maintenance: triage, bug squashing, dependency updates.
  • Bringing missing features to Kotlin Multiplatform: closing platform gaps, uplifting crypto/PKI primitives, and implementing features KMP-first.
  • Interoperability & upstreaming: real-world test vectors, cross-vendor demos, and specs-aligned fixes contributed back to upstream projects so everyone benefits.
  • Developer experience: samples, better error messages, starter kits, docs and demo apps.
  • Roadmap experiments: wallet features, verification and attestation flows, and credential profiles.

→ Explore a curated list of our OSS projects on our website’s open source page or the full list on our org profile.

How we share progress

We work in the open: repos, issues, PRs, and upstreaming all happen in public repositories. Expect changelogs, tagged releases, code reviews, and blatantly transparent and unfiltered discussions in the open.

Featured work

  1. a-sit-plus/vck

    Kotlin Multiplatform library implementing W3C VC Data Model, SD-JWT and ISO 18013-5 credentials

    Kotlin 63
  2. a-sit-plus/valera

    Identity Wallet App written with Compose Multiplatform

    Kotlin 28
  3. a-sit-plus/signum

    Kotlin Multiplatform Crypto/PKI/ASN.1 Library with Attestation and Hardware-Backed Crypto Support on Mobile

    Kotlin 160
  4. a-sit-plus/warden-supreme

    Integrated Key Attestation Suite

    Kotlin 23

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