Cyber security for IT and OT environments

Comprehensive risk analysis and proposed measures
We identify vulnerabilities across your information and industrial systems, assess the risks, and propose concrete measures with clear priorities. From servers and workstations to PLCs, HMIs and vendor remote access - with a focus on legal and international-standard compliance.
Cyber security for IT and OT environments

How the risk analysis works

We find out what threatens your business, how much damage it could cause and what to tackle first. We rate every risk by its probability and potential impact, so you end up with a clear list of priorities - not just a table of numbers. Throughout, we follow the recognised frameworks ISO/IEC 27005, NIST SP 800-30 and IEC 62443.

1 · Identification

We map what matters to your business and what could put it at risk.

  • An overview of the systems, data and devices your business runs on
  • Possible threats - from attacks and human error to outages
  • Weak spots in both technology and processes
2 · Risk assessment

We assess every risk by the damage it could cause and how likely it is to happen.

  • Clear, understandable ratings instead of complex formulas
  • Risks ranked from critical to negligible
  • Priorities based on the real threat to your business
3 · Treatment & output

You receive a concrete action plan - with deadlines, owners and priorities.

  • Practical recommendations for every risk
  • A step-by-step implementation plan
  • Documentation for audits, insurers and compliance

Areas of security measures

Network design and segmentation

Separation of IT and OT networks, segmentation into security zones and controlled crossings per the Purdue model (IEC 62443).

System hardening

Secure configuration of all IT and OT components in line with vendor recommendations and good practice.

Supplier management

Policies for third-party remote access, time limits, logging and session review.

Monitoring and detection

Centralised log collection (SIEM), anomaly detection and alerting for both IT and OT zones.

Access and identity management

Least privilege, central IAM, access audits and privileged access management (PAM/PIM).

Vulnerability and patch management

Regular scanning, CVSS-based assessment and controlled patching, including OT components.

Risk management tool

Moving from Excel to a GRC/ISMS with risk-lifecycle support, workflow and auditability.

Asset management

Central asset register and classification (CMDB) with links to risks, threats and measures.

Physical and environmental security

Server-room protection, temperature / humidity / smoke monitoring, UPS testing and fire-system reviews.

Training and awareness

A security training programme - onboarding and periodic, phishing campaigns and readiness assessment.

Documentation and strategy

Policies and directives: security strategy, access, incident management, asset classification, BCP/DRP.

Specialised for industrial (OT) environments

Production plants play by different rules than office IT. We understand the protocols and risks of PLCs, HMIs and SCADA - and protect them without jeopardising production availability.

OT monitoring / IDS

Threat detection right inside the industrial network.

  • A sensor supporting Siemens S7comm, Modbus and more
  • Automatic OT asset inventory
  • No disruption to production lines
Vendor access management

No direct connections to PLCs - everything through a controlled point.

  • Jump Host / Bastion with session recording
  • Zero Trust access for a limited time
  • MFA and a full audit trail (PAM/PIM)
Secure IT/OT perimeter

Separating production from the internet and office IT.

  • Segmentation per the Purdue model (IEC 62443)
  • A dedicated OT firewall and DMZ
  • Managed changes and regular rule reviews

ELISIT Czech s.r.o.

Kodaňská 46

101 00 Prague

Czech Republic

elisit@elisit.cz

www.elisit.cz

ELISIT Slovakia s.r.o.

Hraničná 18

821 05 Bratislava

Slovakia

elisit@elisit.sk

www.elisit.sk

ELISIT Austria GmbH

Handelskai 265

1020 Vienna

Austria

elisit@elisit.at

www.elisit.at

ELISIT Germany GmbH

Europaplatz 2

10557 Berlin

Germany

elisit@elisit.de

www.elisit.de

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