ASP Encrypt/DeCrypt & Access to MS SQL Conversiin

We have a Collaboration/Groupware system written in ASP 3.0 which needs Web Based Encrytion/Decryption performed on all Source Files including some Javascript. The system consists of just about 500 ASP scripts totaling almost 40MB of ASP code. It is currently an Access 2000 MDB based system that must also be converted to MS SQL Server 2000. We can provide the IIS 2003 hosting environement and FTP Accounts where the conversions must occur. Please indicate whether this will be a client desktop based Encrypt/Decrypt routine or a Web Server based ASP.NET system and whether it is based on an existing Commercial Encryption/DeCryption product (provide web URL) or one written from scratch by you. The system has to run on Windows XP, a Windows 2003 server and IIS 6.0 as well as 5.0. SQL Server 2000 plus next generation SQL Server 2005 must be supported.