GB1532363A - Method of synchronising coding devices for data transmission systems - Google Patents
Method of synchronising coding devices for data transmission systemsInfo
- Publication number
- GB1532363A GB1532363A GB29707/77A GB2970777A GB1532363A GB 1532363 A GB1532363 A GB 1532363A GB 29707/77 A GB29707/77 A GB 29707/77A GB 2970777 A GB2970777 A GB 2970777A GB 1532363 A GB1532363 A GB 1532363A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alignment signal
- alignment
- receiver
- transmission
- cipher
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Lock And Its Accessories (AREA)
- Train Traffic Observation, Control, And Security (AREA)
Abstract
The devices at the transmitting and receiving end are in each case controlled by a clock generator, these clock generators being synchronised at the start of each transmission with the aid of alignment signals. A first alignment signal (KW1) initiates the transmission of cipher signals (SKZ) from the transmitter to the receiver by means of which a cipher generator at the receiving end is programmed. The transmitter transmits a second alignment signal (KW2) in encrypted form (KW2 VS) to the receiver which, following correct decryption of the second alignment signal, transmits a third alignment signal (KW3) as an acknowledgement to the transmitter which then, with a fourth alignment signal (KW4), initiates the transmission of the encrypted message to the receiver. Incorrectly received second, third or fourth alignment signals effect the resetting of the cipher devices by means of circuits (E1, E2) to a basic setting (GSt) and a repetition of the described method steps. <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2631823A DE2631823C3 (en) | 1976-07-15 | 1976-07-15 | Method for synchronizing key devices for data transmission systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1532363A true GB1532363A (en) | 1978-11-15 |
Family
ID=5983088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29707/77A Expired GB1532363A (en) | 1976-07-15 | 1977-07-14 | Method of synchronising coding devices for data transmission systems |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT355635B (en) |
| CH (1) | CH617553A5 (en) |
| DE (1) | DE2631823C3 (en) |
| FR (1) | FR2358789A1 (en) |
| GB (1) | GB1532363A (en) |
| NL (1) | NL7707323A (en) |
| NO (1) | NO148133C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0019756A1 (en) * | 1979-05-21 | 1980-12-10 | Siemens Aktiengesellschaft | Process for verifying the synchronism between two cryptographic devices |
| GB2157924A (en) * | 1984-03-13 | 1985-10-30 | Canon Kk | Data communication apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2939159C3 (en) * | 1979-09-27 | 1982-03-25 | Siemens AG, 1000 Berlin und 8000 München | Method for the synchronization of key devices that are operated as part of a packet network |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL272974A (en) * | 1960-12-29 | |||
| DE1216921C2 (en) * | 1963-12-24 | 1976-05-13 | Gretag Ag | Method for the synchronization of the encryption and decryption of impulse-shaped, binary coded messages, in which the message clear pulses are mixed with key pulses on the sending side |
| FR1582790A (en) * | 1968-01-16 | 1969-10-10 | ||
| DE2017282C3 (en) * | 1970-04-10 | 1974-05-02 | Siemens Ag | Communication system with two-way traffic and pulse operation |
| US3798605A (en) * | 1971-06-30 | 1974-03-19 | Ibm | Centralized verification system |
| US3764742A (en) * | 1971-12-23 | 1973-10-09 | Ibm | Cryptographic identification system |
-
1976
- 1976-07-15 DE DE2631823A patent/DE2631823C3/en not_active Expired
-
1977
- 1977-07-01 NL NL7707323A patent/NL7707323A/en unknown
- 1977-07-12 NO NO772469A patent/NO148133C/en unknown
- 1977-07-12 AT AT500277A patent/AT355635B/en not_active IP Right Cessation
- 1977-07-13 FR FR7721768A patent/FR2358789A1/en active Granted
- 1977-07-14 GB GB29707/77A patent/GB1532363A/en not_active Expired
- 1977-07-14 CH CH875377A patent/CH617553A5/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0019756A1 (en) * | 1979-05-21 | 1980-12-10 | Siemens Aktiengesellschaft | Process for verifying the synchronism between two cryptographic devices |
| GB2157924A (en) * | 1984-03-13 | 1985-10-30 | Canon Kk | Data communication apparatus |
| US4729033A (en) * | 1984-03-13 | 1988-03-01 | Canon Kabushiki Kaisha | Data communication apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CH617553A5 (en) | 1980-05-30 |
| DE2631823B2 (en) | 1978-05-03 |
| FR2358789A1 (en) | 1978-02-10 |
| NL7707323A (en) | 1978-01-17 |
| NO772469L (en) | 1978-01-17 |
| FR2358789B1 (en) | 1985-04-05 |
| NO148133C (en) | 1983-08-17 |
| ATA500277A (en) | 1979-08-15 |
| AT355635B (en) | 1980-03-10 |
| NO148133B (en) | 1983-05-02 |
| DE2631823C3 (en) | 1984-03-01 |
| DE2631823A1 (en) | 1978-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19920714 |