Title:
【発明の名称】暗号化された制御信号の通信システム
Document Type and Number:
Japanese Patent JP3007226
Kind Code:
B2
Abstract:
PURPOSE:To relieve the load on the hardware and the software and to prevent interception to a ciphered control signal by adding an invalid bit and valid bit identification data to a control signal in the operation of a distribution system. CONSTITUTION:A sales office 1 is provided with a master station 2, a general terminal data generating section 4 and a mixer section and connected to a slave station 8 via a common use 2-way transmission line TL. The master station 2 has a control signal generating section 2a and a pseudo ciphering processing section 2b, adds an invalid bit to the control signal to cipher the control signal and adds valid bit identification data representing a valid bit to the ciphered control signal and the data are sent/received between the master station 2 and the slave station 8. A control signal decoder 9 of the slave station 8 extracts the valid bit based on the valid bit identification data added to the ciphered control signal and extracts the true control signal for decoding. As a result, ciphering and decoding are attained with the simple hardware and software without use of a random number.
Inventors:
Yoshiro Noguchi
Kazuo Adachi
Kazuo Adachi
Application Number:
JP14207992A
Publication Date:
February 07, 2000
Filing Date:
May 08, 1992
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H04L9/18; H04L9/00; H04L9/10; H04L9/12; H04L9/36; (IPC1-7): H04L9/18; H04L9/36
Domestic Patent References:
| JP62237483A |
Attorney, Agent or Firm:
Hiroaki Tazawa (2 outside)