GB1356970A - Method of and apparatus for enciphering information by time- interchange of information elements - Google Patents
Method of and apparatus for enciphering information by time- interchange of information elementsInfo
- Publication number
- GB1356970A GB1356970A GB1814671A GB1814671A GB1356970A GB 1356970 A GB1356970 A GB 1356970A GB 1814671 A GB1814671 A GB 1814671A GB 1814671 A GB1814671 A GB 1814671A GB 1356970 A GB1356970 A GB 1356970A
- Authority
- GB
- United Kingdom
- Prior art keywords
- speech
- control
- store
- elements
- 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
- H04L9/34—Bits, or blocks of bits, of the telegraphic message being interchanged in time
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/06—Secret communication by transmitting the information or elements thereof at unnatural speeds or in jumbled order or backwards
Abstract
1356970 Speech secrecy systems PATELHOLD PATENTVERWERTUNGS & ELEKTRO-HOLDING AG 28 May 1971 [7 July 1970] 18146/71 Heading H4R A speech signal in analogue or digitally encoded form is divided into segments of equal length and interchanged in their positions in time under the control of signals generated by a cipher signal. The cipher signal is used to derive control signals determining the position of feed in, or take out, of the elements to or from an information store and a further store is used in the derivation of control signals to ensure that no speech segment is omitted from the transmission and no speech segment is transmitted more than once. As described the segments can be arranged in frames and the segments re-arranged within those frames, or each segment can be re-arranged to occupy a position within a predetermined delay from its original position i.e. a "sliding window" system. The individual segments may also have their polarity inverted, or be masked by adding a digital or analogue cipher signal to increase the difficulty of interception. Fig. 4 shows a system for interchanging elements within a frame and includes stores NS1 and NS2, each of which stores a frame of 6 speech segments each of which is represented by a series of analogue pulses. Elements of incoming speech are stored in one register, NS2, while the previously stored elements in the other register NS1 are read out, in modified order controlled by the cipher generator SG. To prevent repetitions or omissions the circuit ZE includes a store BS which is initially filled at the same time as the information store, NS1, is filled. The cipher generator SG produces signals controlling, via an adder AD and code converter CW, the generation of hunting pulses h to control the emptying of one of the storage locations in the control store BS and feed out of the corresponding speech element from NS1. Should the selected control store location in BS already be emptied a pulse k is generated and applied to adder AD to modify the hunting pulse generation until a filled storage location is encountered, ensuring that the elements are extracted in unbroken and unrepeated extraction. After all the storage locations are emptied the function of the information stores NS1 and NS2 are interchanged. An alternative scrambler, Fig. 5, working on a "sliding window" system has the input speech segments fed into storage locations in NS under the control of the cipher code converter SW which provides switching signals a 2 , a 3 and a 4 having probabilities selected in accordance with values derived in the Specification. In order to prevent elements not being transmitted, or being repeated, a control store BR is provided stepped at the same rate as the information store NS, and interconnected with the switching circuits S1 to S4 to prevent a loading pulse c being directed into an already filled location. An overriding switch S1 is provided to direct a loading pulse into the last storage stage if the stage is not already filled, while the other stages are filled only if that stage is selected by the cipher input, and is not already filled. Other embodiments described, Figs. 7 and 9 (not shown), use magnetic disc stores on a common shaft, each disc carrying the signals representing one speech element with additional control storage registers to allow for progressive switching of the information on the discs to make it equivalent to a moving tape storage system.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH1022770A CH518658A (en) | 1970-07-07 | 1970-07-07 | Process for encrypted message transmission by interchanging information elements over time |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1356970A true GB1356970A (en) | 1974-06-19 |
Family
ID=4360828
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1814671A Expired GB1356970A (en) | 1970-07-07 | 1971-05-28 | Method of and apparatus for enciphering information by time- interchange of information elements |
Country Status (12)
Country | Link |
---|---|
US (1) | US3773977A (en) |
JP (1) | JPS583426B1 (en) |
AT (1) | AT327293B (en) |
BE (1) | BE769493A (en) |
CH (1) | CH518658A (en) |
DE (1) | DE2046630C3 (en) |
DK (1) | DK133649B (en) |
ES (1) | ES392921A1 (en) |
FR (1) | FR2101561A5 (en) |
GB (1) | GB1356970A (en) |
NL (1) | NL167818C (en) |
SE (1) | SE363946B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4642688A (en) * | 1983-06-24 | 1987-02-10 | Scientific Atlanta, Inc. | Method and apparatus for creating encrypted and decrypted television signals |
Families Citing this family (44)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3921151A (en) * | 1971-06-21 | 1975-11-18 | Patelhold Patentwerwertungs & | Apparatus for enciphering transmitted data by interchanging signal elements of the transmitted data without overlapping or omitting any elements within the transmitted signal train |
US3991271A (en) * | 1972-09-29 | 1976-11-09 | Datotek, Inc. | Voice security method and system |
US4020285A (en) * | 1972-09-29 | 1977-04-26 | Datotek, Inc. | Voice security method and system |
CH574692A5 (en) * | 1973-02-13 | 1976-04-15 | Gretag Ag | |
CH558993A (en) * | 1973-03-19 | 1975-02-14 | Patelhold Patentverwertung | PROCEDURE AND DEVICE FOR ENCRYPTED MESSAGE TRANSMISSION. |
CH559483A5 (en) * | 1973-06-12 | 1975-02-28 | Patelhold Patentverwertung | |
CH580893A5 (en) * | 1973-07-02 | 1976-10-15 | Gretag Ag | |
DE2339685C2 (en) * | 1973-08-06 | 1982-06-03 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Circuit arrangement for the disguised transmission of communication signals |
DE2359673C2 (en) * | 1973-11-30 | 1982-05-27 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Method for disguising the information content of frequency bands |
DE2426635A1 (en) * | 1974-06-01 | 1975-12-11 | Licentia Gmbh | Signal content scrambling method - consecutive time sections or representation signals are separately stored |
CH578807A5 (en) * | 1974-11-05 | 1976-08-13 | Patelhold Patentverwertung | |
DE2455477C3 (en) * | 1974-11-23 | 1982-08-26 | TE KA DE Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Method for concealing speech by interchanging the speech segments over time |
CH581412A5 (en) * | 1975-02-26 | 1976-10-29 | Patelhold Patentverwertung | |
US4004089A (en) * | 1975-02-28 | 1977-01-18 | Ncr Corporation | Programmable cryptic device for enciphering and deciphering data |
US4099027A (en) * | 1976-01-02 | 1978-07-04 | General Electric Company | Speech scrambler |
CH607506A5 (en) * | 1976-06-01 | 1978-12-29 | Europ Handelsges Anst | |
US4087626A (en) * | 1976-08-04 | 1978-05-02 | Rca Corporation | Scrambler and unscrambler for serial data |
US4217469A (en) * | 1977-03-15 | 1980-08-12 | Emilio Martelli | Coding and decoding apparatus for the protection of communication secrecy |
US4100374A (en) * | 1977-04-11 | 1978-07-11 | Bell Telephone Laboratories, Incorporated | Uniform permutation privacy system |
GB1553027A (en) * | 1977-05-12 | 1979-09-19 | Marconi Co Ltd | Message signal scrambling apparatus |
DE2809719C3 (en) * | 1978-03-07 | 1985-03-14 | Felten & Guilleaume Fernmeldeanlagen GmbH, 8500 Nürnberg | Procedure to increase security against unauthorized decryption of encrypted speech |
US4232194A (en) * | 1979-03-16 | 1980-11-04 | Ocean Technology, Inc. | Voice encryption system |
US4278840A (en) * | 1979-03-23 | 1981-07-14 | Datotek, Inc. | Dynamic frequency and time voice encryption system and method |
FR2454664A1 (en) * | 1979-04-20 | 1980-11-14 | Telediffusion Fse | SYSTEM FOR ENCRYPTION AND DECRYPTION OF AN ANALOGUE SIGNAL BY TIME COMPRESSIONS AND EXPANSIONS |
US4318125A (en) * | 1979-04-25 | 1982-03-02 | Westinghouse Electric Corp. | Solid state digital audio scrambler system for teletransmission of audio intelligence through a television system |
US4266243A (en) * | 1979-04-25 | 1981-05-05 | Westinghouse Electric Corp. | Scrambling system for television sound signals |
US4295223A (en) * | 1979-04-25 | 1981-10-13 | Westinghouse Electric Corp. | Digital signal/noise ratio amplifier apparatus for a communication system |
DE3138523A1 (en) * | 1981-09-28 | 1983-04-07 | Siemens AG, 1000 Berlin und 8000 München | METHOD FOR TAKE-OFF SECURE FREQUENCY BAND-COMPRESSED TRANSMISSION OF VOICE SIGNALS |
US4965825A (en) | 1981-11-03 | 1990-10-23 | The Personalized Mass Media Corporation | Signal processing apparatus and methods |
US7831204B1 (en) | 1981-11-03 | 2010-11-09 | Personalized Media Communications, Llc | Signal processing apparatus and methods |
USRE47642E1 (en) | 1981-11-03 | 2019-10-08 | Personalized Media Communications LLC | Signal processing apparatus and methods |
US4433211A (en) * | 1981-11-04 | 1984-02-21 | Technical Communications Corporation | Privacy communication system employing time/frequency transformation |
DE3207040A1 (en) * | 1982-02-26 | 1983-09-08 | Siemens AG, 1000 Berlin und 8000 München | METHOD AND ARRANGEMENT FOR TRANSMITTING CHARACTERS |
US4591673A (en) * | 1982-05-10 | 1986-05-27 | Lee Lin Shan | Frequency or time domain speech scrambling technique and system which does not require any frame synchronization |
US4661980A (en) * | 1982-06-25 | 1987-04-28 | The United States Of America As Represented By The Secretary Of The Navy | Intercept resistant data transmission system |
IT1156086B (en) * | 1982-10-25 | 1987-01-28 | Cselt Centro Studi Lab Telecom | METHOD AND STORAGE DEVICE OF NUMERICAL SIGNALS ORGANIZED IN A THREE-DIMENSIONAL WAY AND SUBJECT TO ORTHOGONAL TRANSFORMATIONS |
US4551580A (en) * | 1982-11-22 | 1985-11-05 | At&T Bell Laboratories | Time-frequency scrambler |
US4608456A (en) * | 1983-05-27 | 1986-08-26 | M/A-Com Linkabit, Inc. | Digital audio scrambling system with error conditioning |
US4638357A (en) * | 1984-01-20 | 1987-01-20 | Home Box Office, Inc. | Audio scrambler |
US5253296A (en) * | 1991-11-26 | 1993-10-12 | Communication Electronics | System for resisting interception of information |
US5412719A (en) * | 1992-01-17 | 1995-05-02 | Hitachi, Ltd. | Radio paging system with voice transfer function and radio pager |
AU2000273176A1 (en) * | 2000-09-20 | 2002-04-08 | Yutaka Yasukura | Method of editing/restoring electronic information |
DE10138650A1 (en) * | 2001-08-07 | 2003-02-27 | Fraunhofer Ges Forschung | Method and device for encrypting a discrete signal and method and device for decoding |
US7930331B2 (en) * | 2005-09-26 | 2011-04-19 | Temarylogic Llc | Encipherment of digital sequences by reversible transposition methods |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1953918A (en) * | 1932-03-28 | 1934-04-10 | Associated Electric Lab Inc | Cryptographic system and apparatus |
US2453659A (en) * | 1941-09-05 | 1948-11-09 | Gutzwiller & Co E | Secret telegraph signaling |
US2547515A (en) * | 1949-06-23 | 1951-04-03 | Teletype Corp | Secrecy system |
US3657699A (en) * | 1970-06-30 | 1972-04-18 | Ibm | Multipath encoder-decoder arrangement |
-
1970
- 1970-07-07 CH CH1022770A patent/CH518658A/en not_active IP Right Cessation
- 1970-09-22 DE DE2046630A patent/DE2046630C3/en not_active Expired
-
1971
- 1971-04-20 AT AT335471A patent/AT327293B/en not_active IP Right Cessation
- 1971-05-28 GB GB1814671A patent/GB1356970A/en not_active Expired
- 1971-06-21 US US00154851A patent/US3773977A/en not_active Expired - Lifetime
- 1971-07-05 ES ES392921A patent/ES392921A1/en not_active Expired
- 1971-07-05 DK DK329471AA patent/DK133649B/en not_active IP Right Cessation
- 1971-07-05 FR FR7125390A patent/FR2101561A5/fr not_active Expired
- 1971-07-05 SE SE08682/71A patent/SE363946B/xx unknown
- 1971-07-05 BE BE769493A patent/BE769493A/en not_active IP Right Cessation
- 1971-07-06 NL NL7109284A patent/NL167818C/en not_active IP Right Cessation
- 1971-07-07 JP JP46049645A patent/JPS583426B1/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4642688A (en) * | 1983-06-24 | 1987-02-10 | Scientific Atlanta, Inc. | Method and apparatus for creating encrypted and decrypted television signals |
Also Published As
Publication number | Publication date |
---|---|
JPS583426B1 (en) | 1983-01-21 |
BE769493A (en) | 1971-11-16 |
DE2046630B2 (en) | 1974-08-08 |
CH518658A (en) | 1972-01-31 |
ATA335471A (en) | 1975-04-15 |
NL7109284A (en) | 1972-01-11 |
US3773977A (en) | 1973-11-20 |
DE2046630C3 (en) | 1975-03-20 |
AT327293B (en) | 1976-01-26 |
DK133649C (en) | 1976-11-08 |
NL167818C (en) | 1982-01-18 |
DE2046630A1 (en) | 1972-01-20 |
ES392921A1 (en) | 1973-11-01 |
FR2101561A5 (en) | 1972-03-31 |
NL167818B (en) | 1981-08-17 |
SE363946B (en) | 1974-02-04 |
DK133649B (en) | 1976-06-21 |
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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 |