Cybersecurity & IT Services

When your IT goes down, your business stops. When customer data is stolen, management is liable. sec73 makes sure neither happens — from the first assessment to implementation and ongoing operations. We don't just advise, we deliver: firewalls, server infrastructure, monitoring, and network security. At fair prices, based on open-source technology and without locking you into vendor dependencies.

Our Services

Cybersecurity Consulting — Security audits, risk assessments, and tailored security strategies. Including NIS-2 compliance analysis and documentation.

IT Consulting & IT Services — We analyse your existing IT landscape and implement open-source alternatives where they make technical and economic sense. From the initial audit through migration to ongoing operations.

Firewall & Network Security — Professional network protection with OPNsense. Intrusion detection, VPN, site-to-site connectivity — without expensive feature licences.

IT Security Monitoring (SIEM) — Real-time monitoring of all security-relevant events in your network with Wazuh. Automated alerting, clear prioritization, and audit-ready documentation.

Monitoring & Alerting — Infrastructure monitoring for servers, networks, services, and backups. Problems detected before they become outages.

Identity & Access Management — Controlling who can access what. Single sign-on, multi-factor authentication, and structured access rights with Keycloak and privacyIDEA.

Cloud & Infrastructure — On-premise, private cloud, or hybrid — we plan, build, and operate your infrastructure based on Proxmox, Docker and Kubernetes.

Training & Awareness — Hands-on workshops for security awareness, Linux and open-source tools. On-site in Brandenburg and the surrounding regions or remote.

Why Open Source?

Open-source software powers the internet, the cloud infrastructure of major providers, and the critical systems of banks, governments, and enterprises worldwide. For SMEs, it offers decisive advantages: no feature licenses that disable functionality when they expire, full transparency through open-source code, no vendor lock-in, and complete GDPR compliance through on-premise operation.

Open source does not mean free of charge. Many professional projects offer optional subscriptions for more stable updates, extended support, or additional management features. The key difference: if you don't renew the subscription, everything keeps working. No functionality is removed.

About sec73

sec73 GmbH is based in Wittenberge, Brandenburg. Founded by Marco Mönig, who brings over 30 years of experience in IT security, open-source consulting, and technical training — from SMEs in Germany to international infrastructure projects.

We serve small and medium-sized businesses in the Prignitz and Brandenburg regions and beyond, with on-site support complemented by remote services across the world.