Digital Signature

A digital signature is a cryptographic method used to verify the authenticity, integrity and origin of an electronic document or transaction. It provides proof that a document was signed by a specific person and that nothing in it has been altered since.

How It Works

Digital signatures run on public key cryptography. When someone signs a document, a unique digital certificate and cryptographic key generate a signature that's tied to both the signer and that specific version of the document.

Change even a single character after signing and the signature breaks. That's the point. It makes tampering obvious rather than something you have to hunt for.

This is why digital signatures are used for contracts, regulatory filings, financial transactions and other documents where authenticity isn't negotiable.

Why Legal & CLM Teams Should Care

Most signing processes have two problems: they're slow and they're hard to verify after the fact. Digital signatures solve both.

They can be completed remotely, they create an auditable record of the signing event and they verify signer identity in a way that a scanned PDF simply can't. For legal teams, that means faster execution without trading away security or compliance. If a dispute ever comes up about who signed what and when, there's a cryptographic record to refer to.

Example Use Case

A company sends a vendor agreement through an electronic signing platform. The vendor signs using a digital certificate linked to their identity.

The platform records the event and generates a cryptographic signature confirming who signed the document and that it hasn't been touched since. No back-and-forth, no printed copies and a clear record if anyone asks questions later.

How It Relates to Adjacent Concepts

Digital signatures get mixed up with electronic signatures a lot, but they're not the same thing. An electronic signature is any electronic method of indicating agreement. A digital signature is a specific type that uses cryptographic technology to verify authenticity and detect changes.

They rely on infrastructure like public key infrastructure (PKI) and are recognised under legal frameworks including the ESIGN Act and eIDAS Regulation. Most organisations use digital signatures as part of broader contracting and contract lifecycle management processes.

FAQs

What is the difference between a digital signature and an electronic signature?

Electronic signature is the broad category. A digital signature is a specific kind that uses cryptography to verify who signed and whether the document was changed afterward. All digital signatures are electronic signatures, but not the other way around.

Are digital signatures legally valid?

Yes, in most jurisdictions, as long as they meet the applicable legal and regulatory requirements. Frameworks like ESIGN and eIDAS provide the legal foundation in major markets.

How do digital signatures improve security?

They verify signer identity, make post-signing alterations detectable and create an auditable record of the signing event, which makes fraud significantly harder to pull off.

Related Terms

• Electronic Signature
• Public Key Infrastructure
• ESIGN Act
• eIDAS Regulation
• Clickwrap Agreement
• Wet Signature

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