GB1428469A - Method and apparatus for conversion of graphical clear information into ciphered graphical information and vice versa - Google Patents
Method and apparatus for conversion of graphical clear information into ciphered graphical information and vice versaInfo
- Publication number
- GB1428469A GB1428469A GB2751473A GB2751473A GB1428469A GB 1428469 A GB1428469 A GB 1428469A GB 2751473 A GB2751473 A GB 2751473A GB 2751473 A GB2751473 A GB 2751473A GB 1428469 A GB1428469 A GB 1428469A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulses
- pulse
- train
- code
- card
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09C—CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
- G09C5/00—Ciphering apparatus or methods not provided for in the preceding groups, e.g. involving the concealment or deformation of graphic data such as designs, written or printed messages
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/20—Individual registration on entry or exit involving the use of a pass
- G07C9/22—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder
- G07C9/24—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder by means of a handwritten signature
- G07C9/243—Individual registration on entry or exit involving the use of a pass in combination with an identity check of the pass holder by means of a handwritten signature visually, e.g. by comparing in a viewer the written signature with a reference on the pass
Abstract
1428469 Ciphering and deciphering graphical data GRETAG AG 8 June 1973 [9 June 1972] 27514/73 Heading G5X To convert graphical information, e.g. a cheque card signature, into enciphered form, and to decipher the enciphered form to obtain a clear copy, two similar devices, or possibly one with combined facilities, scan the input optically by means of a flying spot television camera, synchronized with a second CRT displaying the converted data ready to be photographed on to a card in the enciphering application, or open to view when deciphering. The clear data converted to binary pulse form is enciphered by combining it via a modulo-2- mixer (producing pulse output for pulse on one but not both of inputs), with a secret code pulse train, itself selected from a larger stored train by a supplementary code number input via a separate terminal. In addition to the enciphered data the output display contains the supplementary code together with timing and synchronizing pulses. In deciphering, the timing and synchronizing pulses ensure that the device scans the image correctly, in spite of minor errors in position, orientation and scale, and the supplementary code enables the correct part of the secret code train to be drawn out of store. In both devices (Figs. 1, 3) the scanning spot of fixed brightness on CRT 1 is focused on the signature or enciphered card 4 in holder 35, the instantaneous brightness of the reflected spot being measured by photo-electric device 5, amplified 13 and sampled and clipped 14 to produce a pulse train in time with pulses from clock 12. This input train enters the encipher or decipher device at terminals A or D, and the converted train emerges at terminals B or E for possible remote transmission, or via brightness modulator 9 to CRT 2, on which the image is displayed. Both devices possess clock 12, master controller or program generator 11, 23, secret code store 20, code pulse computer 19, modulo- 2-mixer 22, 32 and shift register 15, 33. Synchronizing pulse generators 17 and 28 are similar but have slightly different functions, and supplementary code stores 18, 29 accept code from terminal C and from incoming optical data respectively. In addition the enciphering device (Fig. 1) has AND gate 16 and OR gate 21, while deciphering device (Fig. 3) has AND gates 26, 30, 31, clock synchronizing unit 27 and correlator 43. A signature can be scanned by 120 lines, while each tube displays 600, thus in enciphering the contents of the first of each five lines are stored in shift register 15 and copied four times after the original, forming a line set of five identical lines. Before scan of the signature begins, three line sets in group I (Fig. 2) and a further three in II are traversed in order to print on the enciphered card 6 the pulses in fields TR, SI1, IN, SI2 in groups I and II. When the data scan area III is reached, fields TR and SI1 are added before, and SI2 after, the data. Field TR contains 8 clock pulses in all cases, field IN contains clock pulses in group I, supplementary code as a binary number in group II, and enciphered data in group III. In all groups, fields SI1 and SI2 each occupy ten pulses, of which seven form a synchronizing train from generator 17 of binary form 1110100, starting in alternate line sets at pulse 1 and 4. Counting of pulses and lines to delimit fields and groups is controlled by program generator 11. In deciphering, scan takes place over a field larger than card 6, and as soon as pulses are detected, the pulses in field TR are used to set in clock synchronizer 27 frequency and phase of clock 12 to match the card, a process later reinforced by clock pulses in field IN. The phases (start at 1 or 4) of synchronizing pulses in fields SI1 and SI2 are compared and generate any necessary horizontal component added to vertical scan to correct misalignment of the card with the horizontal scan axis. The line in each line set used for deciphering purposes is the second after the first having SI1 and SI2 pulses in phase with each other, i.e. normally the middle line of five. The start of scan of the critical IN field must be perfectly synchronized with the switch-on of deciphering circuits at deflection Y3; this is accomplished by generating in 28 five synchronizing 1110100 trains, each delayed by one pulse. Only one of these will correlate perfectly, as detected by correlator 43, with the train read from card 7, and three pulses after the end of the selected train, or immediately if the card train starts at pulse 4, the deciphering circuits are activated. In group II these read the supplementary code and load it into store 18, from which it selects the correct block of secret code in store 20, and makes ready code pulse computer 19. On entering the seventh line set, i.e. group III, entry at Y3 into field IN initiates reading of the secret code, continued in each line set for the pre-fixed count of pulses in IN, and re-started at Y3 in the following line set. The secret code pulses are combined with the enciphered data pulses in modulo-2-mixer 32 to produce clear output, stored in shift register 33 and displayed in five successive lines on CRT 2. Use of the wrong secret code can be recognized by blank background areas of the signature field incorrectly deciphered as filled with random pulses.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH859272A CH555577A (en) | 1972-06-09 | 1972-06-09 | METHOD AND DEVICE FOR CONVERTING CLEAR GRAPHICAL INFORMATION INTO ENCRYPTED GRAPHICAL INFORMATION AND REVERSE |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1428469A true GB1428469A (en) | 1976-03-17 |
Family
ID=4342370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2751473A Expired GB1428469A (en) | 1972-06-09 | 1973-06-08 | Method and apparatus for conversion of graphical clear information into ciphered graphical information and vice versa |
Country Status (5)
Country | Link |
---|---|
JP (1) | JPS4985941A (en) |
CA (1) | CA991995A (en) |
CH (1) | CH555577A (en) |
DE (1) | DE2231242A1 (en) |
GB (1) | GB1428469A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2370328A1 (en) * | 1976-11-03 | 1978-06-02 | Gasperi Mario De | SYSTEM FOR THE REALIZATION AND VERIFICATION OF THE AUTHENTICITY OF IDENTIFICATION DOCUMENTS |
EP0006419A1 (en) * | 1978-02-24 | 1980-01-09 | Opticode, Inc. | Signature verification and authentication system |
EP0011671A1 (en) * | 1978-05-19 | 1980-06-11 | Transaction Sciences Corporation | Signature verification system and method of manufacturing a document for an authorized user |
EP0042361A1 (en) * | 1980-06-17 | 1981-12-23 | GRETAG Aktiengesellschaft | Method and device for machine identification of gem stones |
US4454610A (en) * | 1978-05-19 | 1984-06-12 | Transaction Sciences Corporation | Methods and apparatus for the automatic classification of patterns |
FR2592197A1 (en) * | 1985-12-19 | 1987-06-26 | Nixon John | Method of identifying a person, especially a person requesting a service such as, for example, a banking transaction, with the aid of an identification card, device for implementing the method, identification cards usable for the abovementioned method and method for producing such cards |
GB2179008B (en) * | 1985-08-06 | 1990-03-07 | Pitney Bowes Inc | Postage meter with coded graphic information in the indicia |
GB2282563A (en) * | 1993-10-07 | 1995-04-12 | Central Research Lab Ltd | A composite image arrangement for documents of value |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2826469C2 (en) * | 1978-06-16 | 1982-12-02 | The Grey Lab. Establishment, 9490 Vaduz | Procedure and device for securing documents |
JPS60136869A (en) * | 1983-12-26 | 1985-07-20 | Hitachi Ltd | Personal identification system |
WO1985004746A1 (en) * | 1984-04-04 | 1985-10-24 | Barry John Frost | Security system |
-
1972
- 1972-06-09 CH CH859272A patent/CH555577A/en not_active IP Right Cessation
- 1972-06-26 DE DE2231242A patent/DE2231242A1/en active Pending
-
1973
- 1973-06-07 CA CA173,462A patent/CA991995A/en not_active Expired
- 1973-06-08 GB GB2751473A patent/GB1428469A/en not_active Expired
- 1973-06-09 JP JP48065323A patent/JPS4985941A/ja active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2370328A1 (en) * | 1976-11-03 | 1978-06-02 | Gasperi Mario De | SYSTEM FOR THE REALIZATION AND VERIFICATION OF THE AUTHENTICITY OF IDENTIFICATION DOCUMENTS |
EP0006419A1 (en) * | 1978-02-24 | 1980-01-09 | Opticode, Inc. | Signature verification and authentication system |
EP0011671A1 (en) * | 1978-05-19 | 1980-06-11 | Transaction Sciences Corporation | Signature verification system and method of manufacturing a document for an authorized user |
US4454610A (en) * | 1978-05-19 | 1984-06-12 | Transaction Sciences Corporation | Methods and apparatus for the automatic classification of patterns |
EP0042361A1 (en) * | 1980-06-17 | 1981-12-23 | GRETAG Aktiengesellschaft | Method and device for machine identification of gem stones |
GB2179008B (en) * | 1985-08-06 | 1990-03-07 | Pitney Bowes Inc | Postage meter with coded graphic information in the indicia |
FR2592197A1 (en) * | 1985-12-19 | 1987-06-26 | Nixon John | Method of identifying a person, especially a person requesting a service such as, for example, a banking transaction, with the aid of an identification card, device for implementing the method, identification cards usable for the abovementioned method and method for producing such cards |
GB2282563A (en) * | 1993-10-07 | 1995-04-12 | Central Research Lab Ltd | A composite image arrangement for documents of value |
Also Published As
Publication number | Publication date |
---|---|
CH555577A (en) | 1974-10-31 |
DE2231242A1 (en) | 1973-12-20 |
JPS4985941A (en) | 1974-08-17 |
CA991995A (en) | 1976-06-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |