XignIn by XignSys GmbH is a passwordless, cryptography-based multi-factor authentication solution that combines high security with ease of use for various applications. It utilizes biometric features, digital certificates, strong cryptography, and Hardware Security Modules (HSM) to provide secure and seamless authentication without passwords or additional hardware. XignIn is based on a Public-Key Infrastructure and employs state-of-the-art hash algorithms, encryption methods, and protocols. The technology consists of three main components: XignIn-Manager (server-side), XignIn-SDK (client-side library), and an app with integrated XignIn-SDK. XignIn is designed to reduce the risk of cyber-attacks, improve user experience, and enable fully digital transactions across various applications in smart cities, enterprises, and other sectors.