Data encripting transfer

• US 4,989,244 A
• Filed: 03/29/1989
• Issued: 01/29/1991
• Est. Priority Date: 03/29/1988
• Status: Expired due to Fees

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.), Kabushiki Kaisha Shinsangyokaihatsu
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.), Kabushiki Kaisha Shinsangyokaihatsu
• Inventors: Kato, Hideharu, Iwata, Yoshifumi, Naruse, Yoshihiro
• Primary Examiner(s): Moskowitz, Nelson
• Assistant Examiner(s): CAIN, DAVID C
• Application Number:
  US07/330,382
• Time in Patent Office: 671 Days
• Field of Search: 380/18, 380/20, 380/21, 380/23, 380/51
• US Class Current: 380/243
• CPC Class Codes: G06Q 20/341 Active cards, i.e. cards including their own processing means, e.g. including an IC or chip
• CPC Class Codes: G06Q 20/40975 using encryption therefor
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system
• CPC Class Codes: H04L 9/3271 using challenge-response
• CPC Class Codes: H04N 1/4406 Restricting access, e.g. according to user identity mechanisms actuated y cards, PIN or the like in apparatus for dispensing G07F7/08
• CPC Class Codes: H04N 1/4426 involving separate means, e.g. a server, a magnetic card
• CPC Class Codes: H04N 1/4486 using digital data encryption

Abstract

A data encripting transfer system includes a scanner for scanning an object to output an image signal, a data encripting device for encripting the image signal, and a data decoder for decoding the encripted image signal. The system further includes a card having the data encripting device and the data decoder, and a receiving device for receiving the card. The received card enables the data encripting device and the data decoder.

Claims

1. A data encrypting transfer system comprising:

first transmitter/receiver means comprising first transmitting means for transmitting encrypted key data, encrypted image data and a flag signal, scanning means for scanning an object to output an image signal, a key circuit for setting key data, encrypting means for encrypting the key data, and for encrypting the image signal in accordance with the set key data; and

second transmitter/receiver means comprising receiver means for receiving the encrypted key data, the encrypted image data and the flag signal transmitted by said first transmitter means, decoder means for decoding the received encrypted key data, thereby providing decoded key data, and for decoding the encrypted image signal;

said second transmitter/receiver means further comprising means for encrypting the decoded key data, thereby providing answer back data, and second transmitter means for transmitting the answer back data to said first transmitter/receiver means; and

said first transmitter/receiver means further comprising decoding means for decoding the answer back data transmitted by said second transmitter means, comparing means for comparing the decoded answer back data with the key data set by said key circuit, means for setting the flag signal in accordance with whether the comparison indicates that the decoded answer back data is coincident with the key data set by said key circuit, and the decoder means of said second transmitter/receive means being set in accordance with the decoded key data only if the flag signal transmitted by said first transmitter means indicates coincidence between the decoded answer back data and the key data set by said key circuit so that the decoder means of said second transmitter/receiver means decodes the encrypted image signal in accordance with the decoded key data.

2. The system defined in claim 1, wherein said encrypting means comprises a first encrypting circuit and a second encrypting circuit connected to receive an output of said first encrypting circuit.

3. The system defined in claim 1, wherein said decoding means comprises a first decoder circuit and a second decoder circuit connected to receive an output of said first decoder circuit.

4. The system defined in claim 2, wherein said decoding means comprises a first decoder circuit and a second decoder circuit connected to receive an output of said first decoder circuit, and wherein said first encrypting circuit provides a first encrypting function, said second encrypting circuit provides a second encrypting function, said first decoder circuit provides a first decoding function which is an inverse of the first encrypting function, and said second decoder circuit provides a second decoding function which is an inverse of the second encrypting function.

5. The system defined in claim 1, further comprising means for disabling said encrypting means so that said transmitter means transmits said image signal.

6. The system defined in claim 3, further comprising means for disabling said decoding means in response to disablement of said encrypting means.

7. The system defined in claim 1, further comprising card means containing said encrypting means, and card receiving means for receiving said card means, said encrypting means being enabled when said card receiving means receives said card means.

8. The system as defined in claim 1, further comprising card means containing said decoding means, and card receiving means for receiving said card means, said decoding means being enabled when said card receiving means receives said card means.

9. The system defined in claim 6, wherein said means for disabling said decoder means comprises a buffer directly connected to receive signals transmitted by said transmitter means.