METHOD FOR SELECTIVELY RESTORING USER DATA IN INTERNET ELECTRONIC COMMERCIAL TRANSACTION

摘要

PURPOSE: A method for selectively restoring user data is provided for a user to manage an individual key only by the user so as to minimize intrusion, and to selectively request a session key through key restoring system. CONSTITUTION: A transmitter randomly generates an arbitrary key having the same size as a session key used to a data coding. A calculation of an exclusive OR with the session key is performed. A new key is generated. The two keys are respectively coded as a key restoration agent and a public key of a key restoration center. Receiver information is added. Key restoration information is generated. A key restoration filed is generated using the key restoration information. The field is hashed. After that, a digest is generated. The digest is encoded as a personal key of the receiver. A key restoration block is generated using the information generated. The key restoration block is added to the session key encoded, and transmitted to the receiver.