CAPICOM

CAPICOM is a Microsoft® ActiveX® control that provides a COM interface to Microsoft CryptoAPI. It exposes a select set of CryptoAPI functions to enable application developers to easily incorporate digital signing and encryption functionality into their applications. Because it uses COM, application developers can access this functionality in a number of programming environments such as Microsoft® Visual Basic®, Visual Basic Script, Active Server Pages, Microsoft® JScript®, C++, and others. CAPICOM is packaged as an ActiveX control, allowing Web developers to utilize it in Web based applications as well.

On the web at: http://msdn.microsoft.com/en-us/library/ms995332.aspx