GB1379740A - Method and apparatus for encoded messages transmission - Google Patents
Method and apparatus for encoded messages transmissionInfo
- Publication number
- GB1379740A GB1379740A GB5684971A GB5684971A GB1379740A GB 1379740 A GB1379740 A GB 1379740A GB 5684971 A GB5684971 A GB 5684971A GB 5684971 A GB5684971 A GB 5684971A GB 1379740 A GB1379740 A GB 1379740A
- Authority
- GB
- United Kingdom
- Prior art keywords
- store
- generator
- time
- date
- mixer
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/12—Transmitting and receiving encryption devices synchronised or initially set up in a particular manner
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
- H04L9/065—Encryption by serially and continuously modifying data stream elements, e.g. stream cipher systems, RC4, SEAL or A5/3
- H04L9/0656—Pseudorandom key sequence combined element-for-element with data sequence, e.g. one-time-pad [OTP] or Vernam's cipher
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
- H04L2209/12—Details relating to cryptographic hardware or logic circuitry
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Mobile Radio Communication Systems (AREA)
- Storage Device Security (AREA)
Abstract
1379740 Digital transmission; ciphering systems GRETAG AG 7 Dec 1971 [8 Dec 1970] 56849/71 Heading H4P A message is ciphered by mixing clear text with the output from a ciphered pulse generator and a term derived from date and time. An identical generator is provided at the receiver for deciphering. As the initial state of the pulse generator is continually reset the commencing position of the generator is independent of any data supplied earlier. In a preferred embodiment a clock oscillator is used as the derived term source and synchronizing is performed between transmitter and receiver. A non- secret supplementary code is envisaged but is not particularly described in the Specification. An information source, e.g. a teleprinter 9, is connected to a transmission link 148, 148<SP>1</SP> through a mixer 8 which dependent on direction of transmission, adds/subtracts cipher sequences from generator 5 which has a long cycle and may comprise a number of storage units connectible in dependence on a secret code. Generator 5 is connected to a sync. stage 6 and has inputs from a date-time store 1, further store 2, and a mod-2 mixer 18, receiving in turn, output from a cipher store 3. The date-time store provides an output for example once per second representative of, say, date and time, and store 2 provides individual subscribers' addresses where a number of stations are connected into a system. Store 1 may additionally include a pseudorandom generator (16), Fig. 2 (not shown), providing a supplementary code which may also be supplied to mixer 18. In order to maintain sync. it is necessary for the sequence to be interrupted once per cycle for this to be effected. Sync. stage 6 comprises time comparison means 61, time difference store 62 and OR 63 connected through a time correcting means 4 feeding into date-time store 1. The time difference between a received signal and signals produced by generator 5 or a signal produced by the date-time store is measurable at 61 through a switch 23. The time difference may be utilised for resetting a receiver's own clock from unit 61 and this value may be stored in 62 which is cancelled at the end of a message. Store 3 may comprise a random access memory and/or may be connected to store 1 or 2 for further varying the cipher arrangement. The mixer 18 output is dependent on a secret code, date-time code, plus possible supplementary code, hence another subscriber having an identical generator commencing at the same position can decipher messages by means of a similar mixer 8. A suitable cipher generator is described in Specification 1,364,518. The timing clock which is incorporated in unit 1 may embrace a crystal oscillator and frequency divider which provides date-time information. Information from stores 1, 2 is supplied serially which necessitates serial/parallel conversion in (22), (26), Fig. 2, not shown. A separate synchronizing sequence sent at bit rate may be checked at a receiver by a generator which runs at a multiple of bit rate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1813470A CH540613A (en) | 1970-12-08 | 1970-12-08 | Method and device for encrypted message transmission |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1379740A true GB1379740A (en) | 1975-01-08 |
Family
ID=4430724
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5684971A Expired GB1379740A (en) | 1970-12-08 | 1971-12-07 | Method and apparatus for encoded messages transmission |
Country Status (8)
Country | Link |
---|---|
US (1) | US3808365A (en) |
CA (1) | CA956891A (en) |
CH (1) | CH540613A (en) |
DE (1) | DE2160132A1 (en) |
FR (1) | FR2117478A5 (en) |
GB (1) | GB1379740A (en) |
IT (1) | IT943759B (en) |
SE (1) | SE378496B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2161680A (en) * | 1984-07-09 | 1986-01-15 | Toshiba Kk | Transmitter/reciever for signal scrambling |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4166922A (en) * | 1975-04-14 | 1979-09-04 | Datotek, Inc. | Multi-mode digital enciphering system with repeated priming sequences |
US4107458A (en) * | 1976-08-23 | 1978-08-15 | Constant James N | Cipher computer and cryptographic system |
US4133973A (en) * | 1976-11-10 | 1979-01-09 | Datotek, Inc. | Digital cryptographic system having synchronous and asynchronous capabilities |
FR2448824A1 (en) * | 1979-02-06 | 1980-09-05 | Telediffusion Fse | VIDEOTEX SYSTEM PROVIDED WITH INFORMATION ACCESS CONTROL MEANS |
FR2448825A1 (en) * | 1979-02-06 | 1980-09-05 | Telediffusion Fse | SYSTEM FOR TRANSMITTING INFORMATION BETWEEN A TRANSMISSION CENTER AND RECEIVING STATIONS, WHICH IS PROVIDED WITH A MEANS OF CONTROLLING ACCESS TO THE INFORMATION TRANSMITTED |
DE3039105A1 (en) * | 1980-10-16 | 1982-04-29 | Siemens AG, 1000 Berlin und 8000 München | DEVICE FOR ENCRYPTED INFORMATION TRANSFER |
CA1213972A (en) * | 1983-07-13 | 1986-11-12 | Takashi Okada | Apparatus for scrambling a television signal |
US4596898A (en) * | 1984-03-14 | 1986-06-24 | Computer Security Systems, Inc. | Method and apparatus for protecting stored and transmitted data from compromise or interception |
US4747139A (en) * | 1984-08-27 | 1988-05-24 | Taaffe James L | Software security method and systems |
JPH0683202B2 (en) * | 1985-06-25 | 1994-10-19 | 日本電気株式会社 | Data encoding / decoding device |
TR23067A (en) * | 1985-07-12 | 1989-02-21 | Siemens Ag | A METHOD AND EQUIPMENT TO INCRETE THE ENCRYPED RADIO TRAFFIC |
EP0258838A3 (en) * | 1986-09-01 | 1991-01-23 | Siemens Aktiengesellschaft | Process for actualizing the local time of a user of an information tranfer system |
DE3730134C1 (en) * | 1987-09-09 | 1996-05-30 | Siemens Ag | Encryptor operated by authorised card for coded digital transmission |
US4972474A (en) * | 1989-05-01 | 1990-11-20 | Cylink Corporation | Integer encryptor |
US7577188B1 (en) * | 2001-09-13 | 2009-08-18 | Cisco Technology, Inc. | Physical layer and MAC enhancements using complex sequences on a wireless channel |
EP1526648A1 (en) * | 2003-10-21 | 2005-04-27 | Mitsubishi Electric Information Technology Centre Europe B.V. | System and device for modulating UWB pulse sequences |
CN106533529B (en) * | 2016-09-27 | 2020-03-03 | 北京无线电计量测试研究所 | Satellite two-way time comparison modulation and demodulation system and method |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL267662A (en) * | 1960-08-02 | |||
US3614316A (en) * | 1964-05-20 | 1971-10-19 | Us Navy | Secure communication system |
CH439820A (en) * | 1964-11-06 | 1967-07-15 | Gretag Ag | Method and device for encryption and decryption of message signals |
-
1970
- 1970-12-08 CH CH1813470A patent/CH540613A/en not_active IP Right Cessation
-
1971
- 1971-12-03 DE DE19712160132 patent/DE2160132A1/en active Pending
- 1971-12-06 IT IT32099/71A patent/IT943759B/en active
- 1971-12-06 US US00205098A patent/US3808365A/en not_active Expired - Lifetime
- 1971-12-07 SE SE7115689A patent/SE378496B/xx unknown
- 1971-12-07 CA CA129,503A patent/CA956891A/en not_active Expired
- 1971-12-07 FR FR7143864A patent/FR2117478A5/fr not_active Expired
- 1971-12-07 GB GB5684971A patent/GB1379740A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2161680A (en) * | 1984-07-09 | 1986-01-15 | Toshiba Kk | Transmitter/reciever for signal scrambling |
US4700387A (en) * | 1984-07-09 | 1987-10-13 | Kabushiki Kaisha Toshiba | Broadcast system for scrambled programming signals |
Also Published As
Publication number | Publication date |
---|---|
FR2117478A5 (en) | 1972-07-21 |
US3808365A (en) | 1974-04-30 |
IT943759B (en) | 1973-04-10 |
CH540613A (en) | 1973-08-15 |
DE2160132A1 (en) | 1972-06-22 |
SE378496B (en) | 1975-09-01 |
CA956891A (en) | 1974-10-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |