how to create digital signature in web application

Question

how to create digital signature in pdf file using itextsharp dll in asp.net C# web application the digital signature add the pfx source

Bharat Vasant · Answer

Digital Signature may be done form pfx file on the server but now a days, Digital Signature is being issued in USB Tokens or Smartcards. Thus you need a mechanism to access it from Browser which is not easy. Please refer to below complete sample ASP.NET project with source code walkthrough for how to sign or authenticate using Digital Signatue form Browser. http://help.signer.digital/digital_signing_and_authentication_from_web_browser.htm Disclosure: Its a completely free product from my company. This article also has link to download complete source code. It's not possible to discuss source code repeatedly and hence posting the above link. Working sample of the Free Online PDF Signing project is hosted at https://web.signer.digital

Usman Aziz · Answer

As an alternative solution, you can use the following code to sign a PDF document with a digital signature. This code is based on GroupDocs.Signature API. using (Signature signature = new Signature( "sample.pdf" )) { // initialize digital option with certificate file path DigitalSignOptions options = new DigitalSignOptions( "certificate.pfx" ) { // optional: setup image file path ImageFilePath = "sample.jpg" , // set signature position Left = 100, Top = 100, // set Password = "1234567890" }; signature.Sign( "sampleSigned.pdf" , options); }

Leon D · Answer

You can use spire.pdf to create digital signature easily. https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/PDF-Security/Create-Visible-Digital-Signature-in-PDF-with-C-Code.html

Sreekanth Reddy · Answer

Have a look in below link. Might get some idea. https://www.c-sharpcorner.com/article/cryptography-in-microsoft-net-part-ii-digital-envelop-and-d/