I'm not sure what you're trying to do here. Do you have some sample code/data to show? I assume you're referring to Windows registry files and manipulating/reading them. In that case, do you see any modules on CPAN? How about Win32::TieRegistry or Parse::Win32Registry?

Please post better questions so we can help better. :-)

REG_BINARY values are usually not encrypted. The easiest way I can think to get a text string that describes a REG_BINARY value would be unpack, which could give you, for example, a hexadecimal dump via: $hex = unpack "H*", $binary;

Of course, I am assuming that you already have code that gets the REG_BINARY value into $binary. If not, I'd use Win32::TieRegistry (but maybe I'm biased).