Title:
ENCRYPTION COMMUNICATION SYSTEM
Document Type and Number:
Japanese Patent JP3558488
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent unauthorized use and leakage of data due to decoding of leaked encryption data by securing sophisticated data security in the case of data communication between computer networks or at a data card terminal so as to make illegal use of a data card or the like difficult.
SOLUTION: A password generating start information generating program circuit 11 manages and generates information so that same information is not outputted again as password generating start information based on unforeseen information. A data terminal card device 2 uses a password generating program circuit 21 to generate a password based on the password generating start information from a host device 1. The password is fed to the host device 1, where the password is authenticated. When the password matches the password generated by the host device 1, the password is authenticated and communication of encryption data is attained. An encryption circuit 22 controls a plurality of encryption programs elaborately and timewise irregularly to generate encryption data.
Inventors:
Yasuro Fukawa
Application Number:
JP12940597A
Publication Date:
August 25, 2004
Filing Date:
May 20, 1997
Export Citation:
Assignee:
Any Co., Ltd.
International Classes:
G07F7/10; H04L9/12; H04L9/22; H04L9/08; H04L9/32; (IPC1-7): H04L9/32; H04L9/08; H04L9/12
Domestic Patent References:
| JP4113441A | ||||
| JP2145010A | ||||
| JP8331076A |
Attorney, Agent or Firm:
Takao Katori
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