Patent ID: 6922775
Filing Date: 2005-07-26
Classification: H04L

Abstract:
1. Terminal equipment for cryptographic communication in a network system in which a first system and a second system are connected via an external network, said terminal equipment comprising: an enciphering unit, provided in the first system, enciphering a communication text which includes an address of said enciphering unit and is to be output to a terminal equipment destination having a deciphering unit address on the external network, said enciphering unit comprising: a first receiver receiving the communication text which is made in the first system and is to be transmitted via the external network; a first key storage storing keys necessary for a cryptographic communication, the keys stored together and each solely connectedly associated with one of a user and a group of users; a first key retrieving part retrieving a one of the keys associated with the user from said first key storage based on a destination of the communication text; an enciphering part enciphering the communication text into an enciphered communication text using the key retrieved by said key retrieving part; and a first transmitter transmitting the enciphered communication text from said enciphering part to the terminal equipment destination on the external network.