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Patent Searching and Data


Title:
DATA SIGNAL CIPHERING COMMUNICATION TERMINAL EQUIPMENT
Document Type and Number:
Japanese Patent JPH0669917
Kind Code:
A
Abstract:

PURPOSE: To simplify the communication procedure of ciphering communication by setting automatically a ciphering key code through dialing in the data signal ciphering communication terminal equipment communicating data through the use of a digital public network.

CONSTITUTION: The terminal equipment is provided with an own station selection signal memory section 7 outputting an own station selection signal (d) (dial number of its own station) registered and stored in advance, a dial key 6 outputting a selection signal (e) (dial number of an opposite station), an outgoing/incoming call reply circuit 4 sending the opposite station selection signal (e) and the own station selection signal (d) to the opposite station and connecting the line, a ciphering key code generator 3 combining the own station selection signal (d) and the opposite station selection signal (e) or (g) to decide the ciphering key code, a ciphering device 2 ciphering the data signal with the ciphering key code (b) and a decoder 10 decoding the ciphering data signal, and the ciphering key code generator 3 decides automatically the ciphering key code based on the opposite station call signal (e) or (g) received for each outgoing and incoming signal and the own station selection signal.


Inventors:
NAKANO YOSHITAKA
Application Number:
JP1992000222370
Publication Date:
March 11, 1994
Filing Date:
August 21, 1992
Export Citation:
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Assignee:
NEC CORP
International Classes:
H04L9/08; H04L9/06; H04L9/14; (IPC1-7): H04L9/06; H04L9/14
Attorney, Agent or Firm:
京本 直樹 (外2名)