EP0216595A3 - Data encryption - Google Patents
Data encryption Download PDFInfo
- Publication number
- EP0216595A3 EP0216595A3 EP86307139A EP86307139A EP0216595A3 EP 0216595 A3 EP0216595 A3 EP 0216595A3 EP 86307139 A EP86307139 A EP 86307139A EP 86307139 A EP86307139 A EP 86307139A EP 0216595 A3 EP0216595 A3 EP 0216595A3
- Authority
- EP
- European Patent Office
- Prior art keywords
- data
- plain form
- sets
- sort
- fed out
- 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.)
- Withdrawn
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Storage Device Security (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Abstract
Data transmitted over any sort of "broadcast" system
can, in general, be picked up by anyone with the correct sort of
receiver properly tuned in. For many reasons, however, it may
be desirable for the data signals to be "scrambled" or encryp
ted, before transmission so that only the recipient who can
appropriately "unscramble" or decrypt the signal will be able
to see the data in its original plain form.
The invention provides a data encryption/decryption
method (and the equipment therefor), in which plain form
data is transferred sequentially through two sets of analogue
shift registers at a number of different transfer rates such that
for each register data fed in at one rate is then fed out at an
other; whereby the data transferred between the two sets of
registers is encrypted, but when fed out of the last register is
decrypted, and in plain form.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8522979 | 1985-09-17 | ||
| GB8522979 | 1985-09-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0216595A2 EP0216595A2 (en) | 1987-04-01 |
| EP0216595A3 true EP0216595A3 (en) | 1988-10-26 |
Family
ID=10585302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP86307139A Withdrawn EP0216595A3 (en) | 1985-09-17 | 1986-09-16 | Data encryption |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0216595A3 (en) |
| JP (1) | JPS62111542A (en) |
| GB (1) | GB2180728A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2711665B1 (en) * | 1993-10-25 | 1995-12-08 | Atochem Elf Sa | PVDF adhesion binder, its application as a barrier material and materials obtained from it. |
| EP1841272B1 (en) * | 1997-04-24 | 2017-02-15 | Ntt Mobile Communications Network Inc. | Method and mobile station for mobile communications |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4217469A (en) * | 1977-03-15 | 1980-08-12 | Emilio Martelli | Coding and decoding apparatus for the protection of communication secrecy |
| EP0018869A1 (en) * | 1979-04-20 | 1980-11-12 | Etablissement Public Télédiffusion de France | Arrangement for encrypting and decrypting an analog signal by time compressions and expansions |
| US4392021A (en) * | 1980-07-28 | 1983-07-05 | Technical Communications Corporation | Secure facsimile transmission system using time-delay modulation |
| EP0117276A2 (en) * | 1982-09-20 | 1984-09-05 | Sanyo Electric Co., Ltd. | Privacy communication apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59112740A (en) * | 1983-11-28 | 1984-06-29 | Enii:Kk | Secret talk device |
-
1986
- 1986-09-16 EP EP86307139A patent/EP0216595A3/en not_active Withdrawn
- 1986-09-16 GB GB08622238A patent/GB2180728A/en not_active Withdrawn
- 1986-09-17 JP JP21907486A patent/JPS62111542A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4217469A (en) * | 1977-03-15 | 1980-08-12 | Emilio Martelli | Coding and decoding apparatus for the protection of communication secrecy |
| EP0018869A1 (en) * | 1979-04-20 | 1980-11-12 | Etablissement Public Télédiffusion de France | Arrangement for encrypting and decrypting an analog signal by time compressions and expansions |
| US4392021A (en) * | 1980-07-28 | 1983-07-05 | Technical Communications Corporation | Secure facsimile transmission system using time-delay modulation |
| EP0117276A2 (en) * | 1982-09-20 | 1984-09-05 | Sanyo Electric Co., Ltd. | Privacy communication apparatus |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, vol. 8, no. 231 (E-274)[1668], 24th October 1984; & JP-A-59 112 740 (ENII K.K.) 29-06-1984 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62111542A (en) | 1987-05-22 |
| GB8622238D0 (en) | 1986-10-22 |
| GB2180728A (en) | 1987-04-01 |
| EP0216595A2 (en) | 1987-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
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| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
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| 17P | Request for examination filed |
Effective date: 19890109 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19900403 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BRIERLEY, WILLIAM EDWARD |