ICSL focuses exclusively on communications security (COMSEC) — we are not a general IT systems provider or a distributor- or manufacturer-driven sales operation. We dedicate ourselves entirely to our customers' communications security.
What sets us apart from every other provider — and why it matters for security.
Focused on communications security (secure communications) since 2001 — with a dedicated company since 2004, today’s ICSL GmbH
Independent technical evaluation rather than manufacturer marketing
No customer names in marketing — zero knowledge as a principle
FCL, PCLs, NATO approval, ISO 27001 data centres
Security depends on detail. One incorrect parameter, an overlooked log entry, an untested fallback configuration — and a system that appears secure is not.
We test solutions for customers and on our own initiative. This gives us first-hand knowledge of their strengths and weaknesses, including vulnerabilities and missing features.
What is secure today may have a vulnerability tomorrow. ICSL reviews proactively, not only when problems arise.
If a solution has a weakness, we inform our customers — even if the manufacturer is a long-standing partner.
Many of your real needs emerge during use. With ICSL, you do not need a full rollout to discover them. We also provide pilots for 1 year.
Every customer has different requirements — and we can usually address them specifically.
Years of experience give ICSL the expertise to know where to look when assessing solutions or diagnosing faults.
ICSL takes responsibility for systems over many years — beyond delivery.
Test our solutions first-hand on ICSL infrastructure in an ISO-27001-certified data centre in Vienna — experience quality, simplicity and reliability in real use.
On request, your experts review the source code and compile the software on site — so you know exactly what runs on your devices.
For example, a customer commissioned us to test eleven commercially available communications solutions, including approved government apps and well-known business messengers, on iOS and Android. We tested under stress: at 30–50 % packet loss, with 20 kbit/s remaining bandwidth, during call waiting, switching and holding, when changing networks mid-call, and with CarPlay and Android Auto. The results were sobering: few solutions remain reliably usable under real-world conditions. Approval alone does not guarantee practical usability — nor do widespread adoption and heavy promotion.
When operational problems arise, we do not guess: we analyse the logs of all connections, not just reported cases — revealing patterns that individual tests cannot show. In one installation, for example, quality problems occurred precisely during office hours, with identical packet loss for both participants regardless of their network: a clear indication of the underlying infrastructure rather than the app. We also demonstrate test results live to customers on request.
Telecommunications since 1995, communications security since 2001 — and nothing else. No IT services, no cloud consulting, no hardware bundles.
Zero trust, quantum, AI security: ICSL implements technology when it is mature, not merely marketable.
Many organisations buy communications security as an add-on to a larger IT contract. That is understandable — and often dangerous.
ICSL was founded before encryption became commonplace in messaging apps. Many of our customers today did not yet know then that they would one day need us.
30 years — telecommunications and secure communications: the same focus, ever deeper expertise.
ICSL is founded as an internet content provider and telecommunications company.
With market liberalisation, ICSL builds alternative public network operators (PSTN) to compete with the incumbent: as a spin-off, the first alternative operator with interconnection to the incumbent goes live, followed by further spin-offs.
Government agencies, ministries and armed forces become regular customers. ICSL establishes itself as a trusted partner for classified communications for government agencies, businesses and VIPs.
ICSL founds a separate company for secure communications — today’s ICSL GmbH.
NATO-approved solutions bring new engagements.
ICSL provides highly secure communications in a custom configuration to an entire country's senior administration, federal authorities and ministries. For the first time, ministers could exchange classified information across departments with a high level of security. Voice, video, chat, files, conferences and more.
ICSL can deliver the first NATO-approved messenger solution with fully and comprehensively integrated post-quantum cryptography.
ICSL remains exclusively focused on communications security. No general IT, no assortment of unrelated services, no one-way relationship, no conflicts of interest — just the customer.
CEO / Founder
PCL – SecretCTO / Senior Partner
PCL – SecretCAO / Senior Partner
Behind them is an established operations, support and technical team, alongside liaison and partner managers — supplemented when needed by associated companies and experts from TU Wien. Privately run, financially strong, with no liabilities to suppliers or banks: independent, discreet and neutral.
We would be pleased to offer you a confidential briefing without obligation.