A method and system for encrypting a first piece of information M to be sent by a sender 100 to a receiver 110 allows both sender and receiver to compute a secret message key using identity-based information and a bilinear map. The plurality of portions may be attached to the introducer during formation of the introducer, the valve body, or both. The working fluids used in the ORC process are partially or perfluorinated hydrocarbons andor partially or perfluorinated polyethers andor partially or perfluorinated ketones.