JPS5449002A - Secret communication system - Google Patents

Secret communication system

Info

Publication number
JPS5449002A
JPS5449002A JP11597377A JP11597377A JPS5449002A JP S5449002 A JPS5449002 A JP S5449002A JP 11597377 A JP11597377 A JP 11597377A JP 11597377 A JP11597377 A JP 11597377A JP S5449002 A JPS5449002 A JP S5449002A
Authority
JP
Japan
Prior art keywords
code
supplied
terminal
synchronous
secret communication
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11597377A
Other languages
Japanese (ja)
Other versions
JPS592219B2 (en
Inventor
Takeshi Inoue
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP52115973A priority Critical patent/JPS592219B2/en
Publication of JPS5449002A publication Critical patent/JPS5449002A/en
Publication of JPS592219B2 publication Critical patent/JPS592219B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

PURPOSE: To maintain the secretness of a secret communication system on which its transmitter and receiver synchronize each other, even if someone tries to made a wiretap by using a secret communication equipment of the same type, by key-coding synchronous codes with the inverted array of a MLS (maximum period sequence).
CONSTITUTION: A signal indicating a synchronous signal transmission is supplied from input terminal 1 to synchronous code generator 3, whose coding output is supplied to inversion control circuit 13, thereby transmitting bit synchronizing code 10 and frame synchronizing code 11, which is expressed by inverting a code of a maximum period sequence MLS code corresponding to a code supplied from terminal 2, from terminal 4. At the reception side, on the other hand, the pattern of synchronizing code 10 inputted to input terminal 6 is supplied via shift register 6 and coincidence circuit 7 to shift register 14, the output of which is then supplied to coincidence circuit 15, where the synchronous pattern outptted from register 14 in parallel is compared and collated, according to a code from terminal 9, thereby outputting it from terminal 8 according to the discrimination result of circuit 15
COPYRIGHT: (C)1979,JPO&Japio
JP52115973A 1977-09-26 1977-09-26 secret communication device Expired JPS592219B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52115973A JPS592219B2 (en) 1977-09-26 1977-09-26 secret communication device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52115973A JPS592219B2 (en) 1977-09-26 1977-09-26 secret communication device

Publications (2)

Publication Number Publication Date
JPS5449002A true JPS5449002A (en) 1979-04-18
JPS592219B2 JPS592219B2 (en) 1984-01-17

Family

ID=14675702

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52115973A Expired JPS592219B2 (en) 1977-09-26 1977-09-26 secret communication device

Country Status (1)

Country Link
JP (1) JPS592219B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56101890U (en) * 1980-01-08 1981-08-10
JPS63112873A (en) * 1986-10-28 1988-05-17 Hitachi Denshi Ltd Protecting system for digital data

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56101890U (en) * 1980-01-08 1981-08-10
JPS63112873A (en) * 1986-10-28 1988-05-17 Hitachi Denshi Ltd Protecting system for digital data

Also Published As

Publication number Publication date
JPS592219B2 (en) 1984-01-17

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