edit:ah yes... I would pass the sub names as bareword into the @EXPORT array.

edit2: tilly's right. it should be in @EXPORT_OK, otherwise you risk namespace collision, and as tilly said you have no idea where the sub originated from in your main program, unless you do explicit importing of sub names when you  use your module

What does your client look like? You must import the function names via

 
use Config::Confmanager qw{Encrypt Decrypt};
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Also you may need to put

require Exporter;
our @ISA = ("Exporter");
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in your module code.