Patent ID: 6112187
Filing Date: 2000-08-29
Classification: G06Q,G07F,H04L

Abstract:
An encryption communication system comprising:a first communication device for producing significant information for generating a different password at each time of connection for communication; anda second communication device for generating, on receiving said information from said first communication device, a password based on said information, and sending said password to said first communication device;said first communication device comprising:an information producing circuit for producing said information on the basis of an irregular signal;a first password generator for generating the password based on said information by using a password generation program;a decision circuit for determining whether or not the password received from said second communication device and the password output from said first password generator are coincident, and outputting a coincidence signal if the passwords are coincident or outputting a noncoincidence signal if the passwords are not coincident; anda first communication starting circuit for starting encryption communication with said second communication device in response to said coincidence signal;said second communication device comprising:a second password generator for generating, based on said information received from said first communication device, the password by using a same password generation program as said first password generator; anda second communication starting circuit for starting encryption communication with said first communication device in response to said coincidence signal.