Sponsored Post: Securing Structural Integrity: Digital Signatures in the Age of Electronic Plan Submissions

As regulatory pressure mounts and remote collaboration becomes the new normal, structural engineers can no longer rely on traditional wet seals and physical signatures. The shift to digital isn’t optional—it’s essential.

Across the United States, regulatory bodies are updating statutes and administrative codes to support the secure digital submission of engineering documents.

Historically, engineers relied on physical plan sets, wet-ink signatures, and embossed seals to authenticate their work. While these methods served the profession well for decades, they are increasingly out of step with today’s fast-paced, interconnected project environments. The move toward digital signatures and electronic seals is a natural evolution—one that aligns with broader trends in cybersecurity, sustainability, and remote collaboration.

A recent InFocus article in the July 2025 issue of STRUCTURE Magazine focuses on the security of seals and signatures, a topic that has become increasingly relevant as digital workflows become the norm.

Digital signatures use cryptographic algorithms to bind an engineer’s identity to a document in a way that is tamper-evident and verifiable. When properly implemented, they provide:

These features are essential to maintaining trust, accountability, and public safety from rendering to reality.

Building departments in many state and local municipalities now accept digitally signed and sealed engineering and structural plans, helping engineers meet tight timelines for permitting and code compliance. These states have established clear protocols for digital sealing, including the use of X.509 digital certificates issued by trusted Certificate Authorities (CAs). 2025 continues to see more and more states, such as Connecticut and Virginia following suit.

For engineers submitting plans for federally funded projects, plans that are digitally signed with Federal Bridge cross-certified certificates like IdenTrust’s, enable secure submission of plans to any federal agency nationwide.  

For engineers, agencies, and the public, the advantages of digital plan submissions are clear:

One area that continues to generate questions is third-party validation—a requirement that’s becoming more common in digital submission processes. Fortunately, it’s simpler than it sounds. Here’s how it works:

Step 1: Obtain a Digital Certificate

Engineers acquire an X.509 certificate from a trusted Certificate Authority (CA), such as IdenTrust. This certificate links the engineer’s verified identity to their digital signature.

Step 2: Sign and Seal the Document

Using software that supports digital signatures (e.g., Adobe Acrobat, Bluebeam), the engineer applies their digital signature and seal. This creates a tamper-evident record that embeds the certificate into the document.

Step 3: Validation by the Receiving Authority

When the document is submitted, the agency uses the CA’s infrastructure to verify the signature. If the certificate is valid and unaltered, the document is accepted as authentic.

IdenTrust’s certificates are cross-certified with the Federal Bridge, meaning they are recognized by federal, state, and local agencies across the U.S. Engineers can choose between Basic Assurance (remote identity proofing) and Medium Assurance (in-person verification) certificates, depending on the level of trust required.

As more jurisdictions adopt digital submission standards, engineers are learning how to navigate the nuances of compliance. Some key takeaways include:

The future of structural engineering is digital—and secure. As NCSEA and its partners continue to advocate for consistent, modernized regulations, engineers can expect a more predictable and efficient submission process nationwide.