Hi, I'm using Filter::Decrypt and it works fine. Thanks for this. I'm developing and running my Software on Solaris 10 x86 64bit. The Workflow is: Development in my test environment, encrytion, moving the files to the customer, running live. I tried to setup cygwin, to encrypt the files... which works fine. But these files are working only on cygwin, not after copying to solaris. I've made Filter::Decrypt using the same sources on Solaris as on Cygwin... no cross OS compatiblity of the encrypted files !? Any idea? Regards Stefan PS: I need a portable encryption environment. If I have to troubleshoot at customers site, I have no access to my labor, just to customer's labor and i do not want them to peek into my encryption templates or even the printable source code...