Encrypt attributes in an XML file with InstallShield

It is common to require set some configure parameters to encrypted values during installation. Following just show the steps quickly:

1, InstallShield does not have a encryption function out of box. This requires me to write a simple  Encryption.dll in C# or vb.net.

2, Back on InstallShield, create a new custom action "Calling a Public Method in a Managed Assembly".

3, using "XML File Changes" to set the encrypted value.