Notification service to send EMAIL, SMS and WhatsApp

Keycloak extension for OpenID4VP wallet login with multi-credential DCQL, SD-JWT VC and mDoc verification, and did:web, did:webvh and X.509 issuer trust.

Kotlin library for evaluating Android Key Attestation certification chains.

Greek legislation in Markdown — ΦΕΚ Α΄ 2000–2026 (6,804 laws) + consolidated codes (26 codes, 6,359 articles)

Claude Code template for Spring Boot and other staff (included in the tags)

Proximity Identity Reader built using the Multipaz SDK

Custom Keycloak Identity Provider for GSIS (Greece), enabling secure OAuth2/OIDC authentication with TIN validation (ΑΦΜ), user profile enforcement, and session attribute mapping.

A secure, self-destructing credential sharing utility that enforces single-view access and auto-deletion, built with Next.js, ElysiaJS, and Redis TTL.

Meet KSafe. An Effortless Enterprise-Grade Encrypted key-value storage for Kotlin Multiplatform and Native Android with Hardware-Backed Security.

Android Messaging App

The goal of this project is to explore the capabilities of Vault. To achieve this, we will develop applications that utilize Vault to store and retrieve secrets. Vault dynamically generates credent…

My own LLM server.

Narayana Spring Boot autoconfiguration and starter

Demo of using authorization in Spring Security: roles, permissions and more

This is a Spring Boot application demonstrating the Twelve-Factor App methodology

Vaadin UIs for Spring AI

real time face swap and one-click video deepfake with only a single image

Application security best practices and code implementations for Java developers. This project is intended for didactic purposes only, supporting my training course.

EU Digital Identity Wallet RFCs in EWC to align towards the Large Scale Pilot (LSP) usecases. The project is co-funded by the European Union.

Basic brute-force script targeting the standard Keycloak Admin/User Console browser login flow.