Bruno’s whitepaper on digital signatures

In December 2011, the US Office of Legislative Counsel wrote a white paper titled Authentication of Primary Legal Materials and Pricing Options. It revealed the juridical aspects (US law), and mentioned a few solutions (with price indication) by name, amongst others iText.

Based upon that white paper, Bruno wrote a technical paper, explaining in a profound way the various technical aspects concerning digital signatuers in PDF documents, in 5 chapters

  1. Understanding the concept of digital signatures
  2. PDF and digital signatures
  3. Certificate Authorities, certificate revocation and time stamping
  4. Creating signatures externally
  5. Validation of signed documents

You can download the complete whitepaper here:

and the slides here:


About iText Software BVBA

iText ® is a library that allows you to create and manipulate PDF documents. It enables developers looking to enhance web- and other applications with dynamic PDF document generation and/or manipulation.Developers can use iText to:Serve PDF to a browserGenerate dynamic documents from XML files or databasesUse PDF's many interactive featuresAdd bookmarks, page numbers, watermarks, etc.Split, concatenate, and manipulate PDF pagesAutomate filling out of PDF formsAdd digital signatures to a PDF fileiText is available in Java as well as in C#.

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