Cryptographic system and method with key escrow feature

The invention claims with key alternative the third party on the system and method, and using is in examination user personal password key separated for part, and transmitting the element is a private user and a a method of principal-agent, and a system, the system using the same, and public modern proof key management of which is a chip device of proof substrate. Is preferably embodiment of this invention, is only in a condition controlled chip encrypts or deciphers, wherein: (1) And the input of effectively emitting end is in the shape and an effectiveness of receiving end of proves, here the efficient a method for special user the personal password key to stipulate and third party guide mechanism of rope the insulated, and a third party insulation body is shown of the chip oxide register, a (2), with an efficient message control title of the emitting end and a high-efficient wherein a receiving end; the surveyor of therefore to the grant is used for request to obtain and third-party insulated enough information of same. The preferred The embodiment of this invention claims a method for request communication multiple users with a rope, comprising steps: The request third-party insulated centre of the third party insulated of multiple asymmetrical password keys with multiple users accommodating chambers; Of each key of multiple keys of the third party insulated examination centre; centreThe multiple keys' each key licence according to the inspection proof; With according to the proof made of multiple keys' switches corresponding to from the multiple users the communication of each user.