Digital Signature vs Electronic Signature: The Core Differences Explained

When it comes to signing contracts online, many users use the terms "digital signature" and "electronic signature" interchangeably. However, legally and technically, they represent vastly different levels of security and cryptographic validation.

What is an Electronic Signature (e-Signature)? An electronic signature is simply a digital symbol, drawing, or process attached to a contract showing a signer's intent to agree to terms. This can include: - A handwritten signature drawn on a trackpad or touchscreen. - A typed name using a stylized cursive font. - Clicking a checkbox to agree to a Terms of Service block.

E-signatures are legally binding in many jurisdictions under ESIGN or eIDAS acts, but they offer minimal protection against document tampering. If someone edits the PDF after you sign it, there is no built-in mechanism to flag that modification.

What is a Digital Signature? A digital signature is a highly secure, cryptographic technique that binds a signer's identity directly to a document using Public Key Infrastructure (PKI). - It uses hashing algorithms (like SHA-256) to create a unique fingerprint of the document. - It embeds cryptographic certificates in the PDF structure. - **Tamper Evidence**: If a single letter or pixel in the PDF is altered post-signing, the cryptographic checksum fails, rendering the signature invalid immediately.

How DocTuner AI Bridges the Gap DocTuner AI provides a hybrid approach. It allows you to draw or type standard signatures, but integrates a **Secure Audit Trail Page** and calculates SHA-256 hashes of both the original and signed files inside IndexedDB. This ensures maximum local integrity without needing complex server setups.