Trucking Cybersecurity: Securing ELD and Telematics Integrations, API Tokens, and Webhooks

Why Telematics Integrations Are a High Value Target

A modern carrier runs a mesh of connections: the ELD provider pushes duty status and GPS to the TMS, the TMS pushes loads and messages back to the cab, fuel card and maintenance platforms pull odometer readings, and shippers or brokers pull location updates for visibility. Each connection is authenticated by something, usually an API key, a client secret, or a service account password. Those credentials rarely expire, are often created by whoever set up the integration years ago, and frequently carry far more access than the integration uses.

The data behind them is sensitive. Real time location of loaded trailers is useful to cargo thieves. Driver names, license numbers, and contact details are personal information. Hours of service records are regulated: under 49 CFR 395.8(k), a motor carrier must retain records of duty status and supporting documents for six months, and the technical specifications for ELDs in 49 CFR Part 395 Subpart B, Appendix A, include data transfer methods such as telematics web services. If an attacker can alter or delete that data, the carrier faces an operational problem and a compliance problem at the same time. Some telematics platforms also expose remote commands, such as sending messages to drivers or changing device settings, which raises the stakes further.

Start With a Framework: NIST CSF and CISA Guidance

The NIST Cybersecurity Framework, updated as version 2.0, organizes security outcomes into six functions: Govern, Identify, Protect, Detect, Respond, and Recover. It is voluntary, technology neutral, and scales from a small fleet to an enterprise carrier. CISA publishes complementary practical guidance, including its Cross-Sector Cybersecurity Performance Goals, which describe baseline practices such as multifactor authentication, asset inventory, log collection, and incident reporting planning. Neither document is a telematics manual, but together they give the carrier a vocabulary for decisions and a way to show customers and insurers that the program is structured rather than improvised.

OAuth2 Client Credentials Instead of Shared Logins

The worst common pattern is an integration that signs in with a real person's username and password, often an administrator account, because that was the fastest way to make it work. When that person leaves, either the integration breaks or the account stays active for years. Password changes become dangerous because nobody knows which jobs depend on them, and MFA cannot be enabled without breaking the job.

Where the vendor supports it, use the OAuth 2.0 client credentials grant, defined in section 4.4 of RFC 6749. The back office service authenticates with a client ID and client secret, or better, with a private key or certificate, and receives a short lived access token. The token carries scopes that limit what it can do. When the token expires, the service requests a new one. The client secret is the only long lived credential, and it sits in one controlled place. Where the vendor offers only static API keys, create a dedicated key per integration, name it clearly, and restrict it as tightly as the platform allows.

Token Scoping and Least Privilege

Least privilege means each integration can do only what its job requires. A visibility feed that sends location updates to a broker needs read access to vehicle location for the assets on that broker's loads, not write access to driver records or the ability to send in-cab messages. A HOS sync into the TMS needs read access to duty status and logs, not device configuration. A load dispatch integration may need to write messages or routes but should not read payroll related data.

• One credential per integration - Never reuse a key across systems, so one leak does not expose every connection.
• Read only by default - Grant write scopes only where the workflow writes data, and document why.
• Limit data range - Restrict by vehicle group, terminal, or customer where the platform supports it.
• Restrict network origin - Use IP allow lists or private connectivity when the vendor offers them.
• Separate environments - Test and production should never share credentials.

Least privilege also applies to people. Vendor portal access should require MFA, administrator roles should be few and named, and generic shared logins for dispatch should be retired. Our data protection practice helps carriers map who and what can reach each data set.

Secret Storage and Rotation

Client secrets and API keys belong in a managed secret store: a cloud key vault, a dedicated secrets manager, or at minimum an encrypted credential store with access logging. They do not belong in source code, configuration files committed to a repository, email threads, chat messages, or a shared spreadsheet. Applications should fetch secrets at runtime under their own identity, and only the service and a small group of administrators should be able to read them.

Rotation is where good intentions fail, because rotating a secret that six jobs depend on is risky when nobody knows the six jobs. The inventory from the Identify function solves this. For each credential, record the owner, the systems that use it, the scopes, the creation date, and the last rotation date. Then rotate on a schedule the carrier sets, immediately when an employee or contractor with access leaves, and at once after any suspected exposure. Use overlapping credentials where the vendor allows two active secrets, so the new secret can be deployed before the old one is revoked with no downtime.

Example: a 40-truck fleet with one ELD provider might discover six active keys during an inventory: the TMS HOS sync, a fuel tax mileage export, a broker visibility feed, a maintenance platform, a former dispatcher's test script, and one key with no known owner. The first two are scoped down to read only, the broker feed is restricted to location data, the test script key and the unknown key are revoked after a monitored grace period, and all remaining keys go into the vault with a rotation date.

Webhook Signature Verification

Many telematics platforms push events by webhook: a duty status change, a geofence arrival, a fault code. The receiving endpoint is a public URL, so anyone who learns it can send fake events unless the carrier verifies them. Fake arrivals can trigger detention billing errors, false delivery notices, or misleading HOS availability in dispatch.

Most providers sign each webhook with an HMAC, commonly HMAC SHA-256, computed over the raw request body, and often a timestamp, using a shared secret. The receiver should recompute the signature from the raw bytes before any parsing, compare it to the signature header using a constant time comparison, reject requests whose timestamp falls outside a short tolerance window to block replays, and record the event ID to discard duplicates. Serve the endpoint only over TLS, return a quick acknowledgment, and process the event asynchronously so a slow TMS does not cause the provider to retry repeatedly. Failed signature checks should be logged and alerted, because a burst of failures can indicate probing or a rotated secret that was not deployed.

Logging and Detection

A carrier cannot respond to what it cannot see. Log every token issuance, every API call with the credential identity, the endpoint, the record count, and the source IP, every webhook acceptance and rejection, and every administrative change in vendor portals. Send those logs to a central location that the integration itself cannot modify. Useful alerts include token use from an unfamiliar network, a sudden jump in data volume such as a full fleet location export at 3 a.m., repeated authorization failures, and new API keys created outside a change ticket. Keep logs long enough to support an investigation, and align retention with customer contracts and insurance requirements.

Vendor Access Reviews

Telematics vendors, TMS providers, integration platforms, and support contractors often hold standing access to carrier systems. Review that access at least annually and at every contract change. Ask each vendor what data it holds, where it is stored, who on its staff can access it, whether it supports MFA and single sign-on, how it handles key rotation, how it notifies customers of incidents, and whether it can provide an independent assurance report such as SOC 2. Remove accounts for vendors you no longer use. Our related guide on TMS cybersecurity and SOC 2 covers how to read those reports.

Segmenting In-Cab Devices From the Back Office

In-cab tablets, ELD gateways, dash cameras, and trailer sensors live outside the carrier's physical control. A stolen tablet or a compromised device should not become a path into dispatch, accounting, or the domain controller. Put terminal Wi-Fi used by trucks and drivers on a separate network from office systems. Configure devices through mobile device management, restrict them to the vendor cloud endpoints and apps they need, and disable unused radios and ports where the vendor allows. The back office should consume telematics data through authenticated APIs from the vendor cloud rather than through direct network paths into vehicles. Vehicle network connections, such as the diagnostic port the ELD plugs into, are the vendor's design responsibility, but the carrier should ask vendors how they isolate vehicle bus access from cellular and Bluetooth interfaces.

Incident Response for Integrations

Write a short playbook specific to integrations before you need it. It should list every credential and how to revoke it, vendor security contacts and support escalation paths, who can authorize shutting off a feed, how dispatch will operate if the HOS sync is down, and how to notify customers whose visibility feeds are affected. Under the ELD rules, carriers should also know the 49 CFR 395.34 procedures for ELD malfunctions, since a device or service failure may require drivers to reconstruct records of duty status and the carrier to follow the malfunction timelines.

After containment, recovery means issuing new credentials, backfilling events missed while feeds were off, reconciling HOS and GPS data against the ELD provider's records, and documenting what happened. Rehearse the playbook with a tabletop exercise at least once a year. For broader ransomware planning, see our guide on the commercial carrier cybersecurity ransomware shield and the general trucking cybersecurity guide.

A Practical 90 Day Plan

Days 1 to 30, inventory every integration credential, webhook endpoint, and vendor account, assign an owner to each, and enable MFA on all vendor portals. Days 31 to 60, move secrets into a vault, replace shared user logins with dedicated client credentials, reduce scopes, and turn on webhook signature verification. Days 61 to 90, centralize logs, configure alerts, complete vendor access reviews, segment terminal networks, and run a tabletop exercise on a leaked token. Each step reduces risk on its own, and none requires replacing the TMS or the ELD platform.

Related practice areas for this work include Data Protection, ELD and EDI Integration, IT Strategy and Planning, and Fractional Freight CIO. Each practice page describes scope, deliverables, and how an engagement starts with a short discovery call.

How Strong Tower Consulting Helps

Strong Tower Consulting helps carriers inventory integrations, redesign credentials around least privilege, and build monitoring and response that dispatch and IT can both operate. The work is practical and sized to the fleet, with written runbooks rather than a stack of new tools. Strong Tower Consulting, LLC and Exspeedite LLC are separately organized sister companies under common ownership. That separation keeps consulting advice vendor neutral and focused on the carrier operation. This guide is general information, not legal advice.

To review your ELD and telematics integrations, contact us or call 763-244-1373 and ask for Scott Elliott.

Frequently Asked Questions