As more devices join the growing Internet of Things (IoT), security has become a top concern for both consumers and organizations. Traditional network security methods struggle to effectively secure the huge volumes of often low-power and resource-constrained IoT devices.
Public key infrastructure (PKI) provides a scalable solution for authenticating and encrypting communications between IoT devices and servers. However, maintaining your own PKI can be complex and expensive.
A managed PKI service removes this administrative burden and ensures IoT security is continuously maintained as your network expands. This article will discuss five key reasons why a managed PKI is essential for securing today’s sophisticated IoT environments.
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Secure Device Authentication
The first and most basic of all security that any IoT deployment needs to address is proper device authentication within the network. Proper authentication is necessary because, without it, the devices cannot be easily identified as genuine or rogue, which provides a significant window for the adversary to break into systems or spoof trusted devices.
PKI solves this problem with asymmetric or public key cryptography. Every single device was issued a unique digital certificate containing a public key and signed by a trusted certificate authority (CA). With this, the device can cryptographically prove its identity without any need to exchange secrets, using its corresponding private key. The authentication of PKI is highly strong concerning the identification of devices but not the types of devices.
More significantly, managed PKI provides a standard and consistent way for IoT authentication in heterogeneous environments. That means that devices from different vendors and different platforms can rely on a third-party PKI provider to establish the same root of trust.
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Data Encryption
While authentication helps to prevent unauthorized access, data encryption is equally important to prevent monitoring, interception, and manipulation of IoT communications and stored information. Encryption protocols like Transport Layer Security mandate that a valid X.509 digital certificate must be bound to a cryptographic key pair to establish secure sessions. However, many of these challenges are similar to those seen when generating, signing, and maintaining certificates internally for authentication.
A managed PKI avoids these difficulties by issuing centrally from a global trust infrastructure encryption certificate to all IoT devices. The devices then use their private keys to negotiate encrypted tunnels, such as TLS, to assist in the safeguarding of data while in transit.
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Identity Management
With authentication and encryption addressed, the following requirement is centralized identity management of all participating entities. IoT brings new challenges of associating numerous physical things with corresponding digital identities and credentials stored within PKI. A scalable directory service is needed to map device certificates to real-world information like serial numbers, configurations, location data, and associated user accounts.
A managed PKI pairs with an identity management system, providing a single point of administration for IoT identities across their entire lifecycles. As new devices are enrolled, they are automatically provided with the right authentication and data protection capabilities per assigned access roles. Administrators gain visibility into all credentialed system participants through an identity repository. Compromised or decommissioned devices can also be easily revoked, and new credentials can be reissued to replace invalidated ones.
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Secure Firmware Updates
As with any system, IoT devices require occasional firmware and software patches to remedy bugs, add features, and fix vulnerabilities discovered after deployment. However, updating firmware in distant or mobile endpoints presents security risks if not rigorously controlled and authenticated. Without proper controls, adversaries could potentially inject malicious code disguised as legitimate updates. This makes IoT networks highly susceptible to compromise through supply chain attacks.
PKI protects against such threats using digital signatures to verify software package integrity and origin. A code signing certificate issued through managed PKI binds a cryptographic signature to update files. Devices can then confirm the signed package was created by an authorized developer before installing the new code. In combination with over-the-air update capabilities, PKI provides a “one-to-many” model for remotely validating firmware updates across entire device fleets.
Furthermore, many regulations require auditable traceability of software and configuration revisions rolled out to products. The signing certificates issued by a specialized PKI service meet these requirements through cryptographic proof of authenticity and chain of trust tracking. Compared to alternative techniques, PKI offers a standardized long-term solution managed centrally without added device costs. Ultimately, a managed PKI is indispensable for securing IoT software supply chains and life cycles through digitally signed code distribution.
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Compliance and Regulatory Requirements
Security is now mandated for many industry IoT applications involving sensitive data, medical devices, industrial controls, and other regulated systems. Vertical standards like ISO 27001 and government statutes such as GDPR establish baseline security controls that organizations must demonstrate. Validated use of standard PKI technology is a common requirement across frameworks for meeting compliance objectives.
Internally running a PKI introduces auditing difficulties due to a lack of specialized expertise and dedicated resources. Noncompliance penalties can be severe, including substantial fines. Outsourcing PKI responsibilities to a trustworthy third party shifts this compliance burden. Managed PKI providers are solely focused on PKI best practices refined over decades of real-world use. Services are designed from the start to support comprehensive audits and regulatory reviews.
Final Thoughts
As the consequences of lax IoT security become increasingly evident, robust authentication, encryption, identity, and software update controls will be non-negotiable for large-scale deployments. Traditional PKI addresses these needs, but internal management poses scalability limits and compliance challenges unsuited for most organizations. A managed PKI service from an expert provider removes these administrative burdens to reliably and cost-effectively secure even the largest and most regulated IoT networks.