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signer.digital Web Server
(with REST APIs & CORS)

Signer.Digital Web Server and Rest API

Signer.Digital Webserver is modern cross platform web application and Rest API developed on .NET Core 3.1 for Signing PDF from Modern Web Browsers.

Signer.Digital Web Server supports Windows, Linux or Mac platforms.

Being cross platform application, Signer.Digital WebServer is also suitable to deploy on Linux and Mac Desktops as standalone signing solution using local USB Token.

The product runs as a Web Server providing Web based Console to manage and monitor Signer.Digital Service and also provides Rest API’s that can integrate with any web based application where it is not possible to integrate .NET or Java libraries (with corresponding PDF component) due to various reasons like .NET or Java version incompatibility, easy unavailability of affordable PDF component for the required platform, or requirement to support signing from multiple applications by keeping the Signature access code centralized.

Rest APIs provided by webserver helps application developers to just call a HTTP API just by posting Signature Setting Name and file or PDF file byte array and get the signed file or PDF file as a response to HTTP API call.

signer.digital web Server

digital.signer Web Server supports Windows, Linux & MAC Platforms.

Important: Please check our Server (bridge) Application which is ready to deploy and does not need a single line of code for integration.

We Offer Dual Variants in Webserver

Signer.Digital Webserver Digital Signature Rest API may be integrated with any Web Application for interactive signing from user’s token connected to users device, by selecting enabling of CORS (Cross Origin Resource Sharing) and comes in two flavors

signer.digital Web Server Without UI

Without UI

  • Basic User Management UI .
  • Actual Signing is done by Rest API.
signer.digital Web Server With UI

With UI (User Interface)

  • Signature Setting for multiple users.

  • User Management.

  • Supports Multiple Signatures on PDF and Certified Signatures on PDF.

  • Interactive signing by adding remark (annotation) before signing, by drawing rectangle signature position in PDF Viewer.

  • Manual (Bulk) Signing has option to sign in bulk or interactively in bulk.

  • Multiple signing workflow can be designed by cascading Manual Signing Profiles.

  • Pre-processors and Post-processors for PDF may be developed and wired up as per clients’ distinct requirements.

Technical Specifications

signer.digital Browser Extension Technical Specifications
  • Web application with support for document signing from USB Token or Smartcard connected to client’s browser.
  • PDF Document to be Signed never leaves your server or subnet boundaries.
  • Web application needs to consume Rest API after page/view is rendered in browser and establishes CORS connection from browser to Signer.Digital Webserver.
  • More technically, PDF Digital Signing Works by establishing tri-party connection between Signer.Digital Webserver – Web Application Host – Signer.Digital Browser Extension through web application page/view.
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Browser Plugin POC

Security Features nested in signer.digital Webserver

  • Uses JWT (JSON (JavaScript Object Notation) Web Token) token for API authentication with configurable expiry duration.
  • JWT secret is not stored in plain text on the server but stored encrypted on the server and machine specific data protection provider with 90 days automatic key rotation is used for encrypting the same.
  • Thus JWT secret, used to sign Auth Tokens, would be decryptable only on the server from the specific application and not from other application or server.
  • User password is not stored in plain text but cryptographically.
  • Sensitive data like PIN, passwords and pfx signature files are stored encrypted in database. Encryption key is stored securely in environment variables.
  • Database password is encrypted before storing in config file or may be moved to Environment Variables.
  • Web application has captcha and uses Secure cookie based authentication and all posts are verified for Anti-forgery Token to prevent XSRG/CSRF attacks.
  • Generally known Headers required to enhance security are added.
signer.digital Webserver Security

How it Works

How It Works signer.digital Web Server scaled
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Browser Plugin POC
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