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IoT/OT consulting services for automated certificate management
Today, IoT and OT devices as well as shop-floor control systems are largely interconnected. This increases the need to secure data traffic, clearly identify devices, and maintain control over digital certificates throughout their entire lifecycle. Certificates from a private, trusted PKI (Private Trust Certificates) provide the foundation for TLS-secured communication, device authentication, and automated certificate processes.
essendi it supports operators, machine and plant builders, and manufacturers in integrating existing device landscapes into centralized certificate processes without being tied to individual vendors — from analyzing existing environments to automated certificate distribution.
Today, machines, controllers, cameras, switches, and other devices are increasingly connected. They require remote maintenance, recurring updates, access to external data sources, or a secure connection to central systems, for example for cross-environment monitoring.
This also changes the security model. It is no longer enough to control access to the network alone. Security is moving more strongly to the device level: devices must be able to identify themselves to systems and services (unique identification), while connections must be secured in a traceable way (encrypted communication). Certificate management is therefore becoming an important part of IoT security, OT security, and secure device communication.
In established IoT and OT landscapes, devices from different manufacturers and generations rely on different interfaces. Some devices support modern certificate processes, while others depend on proprietary mechanisms or manufacturer-specific tools. This makes unified management more difficult and limits transparency.
The challenge does not end with the initial provisioning of a certificate. If certificate management is to be automated across the entire lifecycle, issuance and renewal must work together reliably.
At the same time, operational conditions must be taken into account: in production environments, buildings, or critical infrastructures, changes can often only be made during defined maintenance windows or under specific conditions.
This creates a dual challenge for organizations: they need central control and a reliable overview of their device certificates, while also considering the technical limitations of individual devices, existing interfaces, and operational availability requirements.
essendi it works with customers to develop reliable certificate processes for heterogeneous device landscapes. The focus is not on a single manufacturer tool, but on a centrally controllable process: from analyzing the existing environment and suitable interfaces to automated certificate distribution.
A vendor-independent approach is essential here — one that is aligned with established standards and the operational requirements of the respective environment. In many IoT and OT environments, devices from different manufacturers and generations coexist.
If certificates are managed only through individual manufacturer tools, parallel processes and limited visibility arise. The goal is therefore an overarching management approach that integrates different devices while also taking the operational requirements of the specific environment into account.
This creates solutions that bring together technical feasibility, automation, and operational reliability. Certificate provisioning and renewal remain controlled without ignoring the specific realities of production, plant operation, or infrastructure environments.
essendi it helps organizations structure and implement certificate processes for IoT and OT devices. We look beyond the individual devices and also take into account the technical and organizational conditions of the respective environment.
The starting point is an analysis of the device landscape: Which devices are in place, which certificates are required, and which interfaces are available? We also clarify the conditions under which certificates can be provisioned or renewed. On this basis, we assess technical feasibility and develop a solution concept that fits the specific environment.
Another focus is process design. Certificates must be requested, distributed, and renewed without losing sight of availability and maintenance planning. This is why we consider technical requirements as well as maintenance windows and organizational processes in operation.
Depending on the starting point, we support proofs of concept, pilots, and the subsequent implementation. This includes integrating suitable interfaces, connecting to central certificate processes, and preparing scalable workflows for additional devices and sites. If needed, we also support operations, maintenance, or the enablement of internal teams.
IoT/OT certificate management involves different roles, from device development to ongoing operation. Each perspective brings different requirements: securely managing existing environments, integrating certificates into plant concepts, or providing suitable interfaces.
For operators, the secure operation of established device landscapes is the main focus. Certificates must be managed and renewed reliably without unnecessarily disrupting production processes, building operations, or distributed infrastructures.
Machine and plant builders need to integrate their systems into certificate-based security architectures. essendi it helps develop suitable integration paths that remain scalable even in complex plant environments.
or manufacturers, it is essential that devices provide suitable interfaces and processes for digital certificate management. essendi it provides guidance on how certificates can be managed automatically on devices and reliably renewed later — from the technical interface to subsequent use in customer environments.
Automated certificate management for IoT and OT devices becomes relevant wherever connected systems must communicate securely and operate reliably over long periods of time. Requirements differ depending on the industry, operating environment, and device landscape. What they have in common is the need for controlled certificate processes that can be reliably automated.
In industrial production environments, machines, controllers, switches, and other connected components must be securely integrated into existing IT and OT structures. Certificate management helps uniquely identify devices, encrypt communication, and plan certificate changes as part of ongoing operations.
n machine and plant engineering, certificate requirements often arise as early as the design phase of new systems. It is essential that machines, plants, and gateways can later be operated securely in customer environments. Interfaces, certificate processes, and operating models therefore need to be considered at an early stage.
Automotive production environments place high demands on availability, standardization, and scalability. Certificate processes support the security of connected production lines and production-related infrastructure.
In facilities and infrastructure settings, cameras, control systems, monitoring systems, and other devices are increasingly connected. Certificate management helps implement secure communication and controlled device identities, even across heterogeneous infrastructures.
Public infrastructures also create requirements for secure device communication and manageable certificate processes. Examples include digital displays, clocks, and other technical systems at train stations, airports, and transportation hubs. In addition, connected systems contribute to securing means of transport.
The technical implementation depends heavily on which devices, interfaces, and security requirements are present in the respective environment. essendi it assesses which paths are realistically usable for automated certificate management — from standardized protocols to individual integration approaches.
The focus is on X.509 certificates, secure keys, and traceable trust relationships. Depending on the environment, this may involve integrating existing PKI structures, connecting suitable Certificate Authorities, or developing a viable trust model for devices, machines, and other OT components.
Different technical paths may be relevant for connecting IoT and OT devices. These include standards and interfaces such as OPC UA, REST, CLI, ACME, SCEP, BACnet, or Profinet. Beyond the availability of an interface, the key question is whether it supports controlled, repeatable certificate processes.
Technical interfaces must be integrated into an overarching process. This includes governed workflows for request, provisioning, and renewal, as well as transparency over existing device certificates. This connects the operational device level with central Certificate Lifecycle Management.
Standards such as IEC 62443 provide an important framework for industrial IoT and OT environments. Depending on the required level of protection, Security Levels such as Security Level 3 may also become relevant. essendi it takes these requirements into account when assessing device landscapes, interfaces, and certificate processes.
essendi xc is the central platform for Certificate Lifecycle Management. It enables certificates to be managed, controlled, and renewed throughout their entire lifecycle. essendi da extends these processes to IoT and OT devices and supports the deployment of certificates to devices via suitable interfaces.
The solution is designed for operational use in production and manufacturing. Teams responsible for production and manufacturing gain a device-centered view of certificate status, required action, and implementation during ongoing operation.
Whether and how both solutions are used depends on the respective environment. In consulting, we assess how central certificate management can be transferred to the device level from both a technical and organizational perspective.
Whether the starting point is an existing device landscape, a new plant concept, or interface requirements on the manufacturer side, the right path always depends on the specific environment. What matters is how certificate processes can be implemented technically and integrated into ongoing operation.
essendi it helps you clarify these questions step by step and derive a feasible path toward automated, vendor-independent certificate management.
Zertifikatsmanagement für IoT und OT beschreibt die kontrollierte Verwaltung digitaler Zertifikate auf vernetzten Geräten, Maschinen, Steuerungen und weiteren OT-Komponenten. Ziel ist es, Geräte eindeutig zu identifizieren, Kommunikation über TLS abzusichern und Zertifikate planbar bereitzustellen, zu erneuern und zu überwachen.
IEC 62443 gibt einen wichtigen Rahmen für die Cybersecurity industrieller Automatisierungs- und Steuerungssysteme. Für IoT-/OT-Zertifikatsmanagement sind vor allem Anforderungen an Identifikation, Authentifizierung, Integrität, Vertraulichkeit und Verfügbarkeit relevant. Digitale Zertifikate unterstützen dabei, Geräteidentitäten und sichere Kommunikation strukturiert umzusetzen.
Security Level 3 beschreibt im Kontext der IEC 62443 ein erhöhtes Sicherheitsniveau für industrielle Systeme, bei dem auch gezielte Angriffe mit erweitertem technischem Aufwand berücksichtigt werden. Für Zertifikatsmanagement bedeutet das: Geräteidentitäten, sichere Kommunikation und kontrollierte Zertifikatsprozesse müssen so gestaltet werden, dass sie zum geforderten Schutzbedarf der Umgebung passen.
OPC UA und BACnet sind Beispiele für Standards und Protokolle, die für sichere Gerätekommunikation und Geräteidentitäten relevant sein können. OPC UA nutzt X.509-Zertifikate für die Absicherung von Anwendungen und Verbindungen. In BACnet-Umgebungen kann Zertifikatsmanagement dort relevant werden, wo sichere Kommunikation und vertrauenswürdige Geräteidentitäten umgesetzt werden sollen. In beiden Fällen hilft ein geregeltes Zertifikatsmanagement dabei, Zertifikate bereitzustellen, zu erneuern und konsistent zu verwalten.
Das hängt von den technischen Möglichkeiten des jeweiligen Devices ab. Entscheidend ist, ob geeignete Schnittstellen vorhanden sind, wie Zertifikate auf das Gerät gebracht werden können und welche Grenzen durch Rechenleistung, Netzsegmentierung oder Wartungsfenster bestehen. Im Consulting prüft essendi it, welche Integrationswege realistisch nutzbar sind und wie sich Zertifikatsprozesse betriebssicher umsetzen lassen.