JPS5449002A - Secret communication system - Google Patents
Secret communication systemInfo
- 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
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
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)
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 |
-
1977
- 1977-09-26 JP JP52115973A patent/JPS592219B2/en not_active Expired
Cited By (2)
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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