I am having digital signatures with me installed on my computer.. And I am working in ASP.Net C# (2005 framework 2.0) in this web application I am trying to make some pages which sign the data using the digital signature and save it on the server in either of the format .doc or excel file PowerPoint file or HTML or pdf file ... or the data may be stored in the database (in my application db is MySQL) and as and when require i want to retrieve those file decrypt them using the digital signature and then save them to the local machine or just to view information..... this is the scenario i want to work on but no ideas of digital signature trying this since 4 days on Google didn't find any solution... Please Help me