Card cradle system and method

• US 6,145,035 A
• Filed: 02/25/1999
• Issued: 11/07/2000
• Est. Priority Date: 02/25/1999
• Status: Expired due to Fees

• Current Assignee: Dallas Semiconductor Corporation (Analog Devices, Inc.)
• Original Assignee: Dallas Semiconductor Corporation (Analog Devices, Inc.)
• Inventors: Hui, Titkuan, Mendenhall, Wayne, Scherpenberg, Francis A., Mai, Chao C.
• Primary Examiner(s): Myers, Paul R.
• Application Number:
  US09/257,812
• Time in Patent Office: 621 Days
• Field of Search: 713/200, 340/825.31, 340/825.34, 710/62, 710/102, 386/52, 705/41, 235/379-382
• US Class Current: 710/62
• CPC Class Codes: G06K 19/005 the record carrier comprising an arrangement to facilitate insertion into a holding device, e.g. an arrangement that makes the record carrier fit into an etui or a casing ticket holders A45C11/18
• CPC Class Codes: G06K 19/07 with integrated circuit chips
• CPC Class Codes: G06K 19/0702 the arrangement including a battery
• CPC Class Codes: G06K 7/006 the housing being a portable casing
• CPC Class Codes: G06Q 20/105 involving programming of a portable memory device, e.g. IC cards, "electronic purses"

Abstract

A system comprising a card device for effectuating a transaction when presented to a transaction terminal, the card device including a memory and a first energy source, the source for powering the memory for a period of time, and a card cradle carrier for storing the card device when the card device is not engaged in the transaction. The card cradle carrier is formed of a substantially rigid material and forms at least a portion of a personal effect. In accordance with the teachings of the present invention, the card cradle carrier includes a second energy source for recharging the first energy source when the card device is received for storage by the card cradle carrier.

Claims

1. A system, comprising:

a card device for effectuating a transaction when presented to a transaction terminal, said card device including a SRAM memory and a rechargeable energy source, said source for powering said memory being only of a size sufficient to power said card device for a limited period of time;

a card cradle carrier for storing said card device when said card device is not engaged in said transaction, said card cradle carrier formed of a substantially rigid material and forming at least a portion of a personal effect, wherein said card cradle carrier includes a second energy source for recharging said rechargeable energy source when said card device is received for storage by said card cradle carrier and further wherein said card cradle further includes a lasered read-only memory (ROM) identification block; and

means for rapidly zeroization of said SRAM unit after a select period of time has elapsed between removal of said card from said cradle without engaging said card in a transaction as determined by a true-time non-resettable clock.

2. The system as set forth in claim 1, wherein said first energy source comprises a capacitor.

3. The system as set forth in claim 1, wherein said card device further includes control means for turning power off from said first energy source after a select time interval is elapsed.

4. The system as set forth in claim 1, wherein said card cradle carrier further includes:

a power control and regulation module coupled to said second energy source;

a real-time-clock and timer module coupled to said power control and regulation module;

a card interface module for coupling with said card device when said card device is received by said card cradle carrier;

a controller coupled to each of said real-time-clock and timer module said power control and regulation module and said card interface module for controlling signal communication therebetween; and

wherein said lasered read-only memory (ROM) identification block coupled to said controller is for identifying said card device when presented to said card cradle carrier for storage.

5. The system as set forth in claim 4, wherein said second energy source comprises at least one Lithium (Li) Ion cell.

6. The system as set forth in claim 4, wherein said second energy source comprises at least one Nickel Metal Hydride (NiMH) cell.

7. The system as set forth in claim 4, wherein said card cradle carrier further comprises alarm means for generating an alarm when said card device is removed from said card cradle carrier for more than a pre-determined time duration.

8. The system as set forth in claim 7, wherein said alarm comprises an audible indication.

9. The system as set forth in claim 7, wherein said alarm comprises a visible indication.

10. The system as set forth in claim 1, wherein said personal effect comprises a wallet.

11. The system as set forth in claim 1, wherein said personal effect comprises a purse.

12. The system as set forth in claim 1, wherein said personal effect comprises a handbag.

13. The system as set forth in claim 1, wherein said personal effect comprises a pouch.

14. The system as set forth in claim 1, wherein said personal effect comprises a briefcase.

15. A smart card device capable of storage in a cradle, said cradle including a primary power source, said smart card device comprising:

a circuit for effectuating a cryptographic function in connection with a transaction when said smart card device is presented to a transaction terminal, said circuit including a static random access memory (SRAM) unit;

a rechargeable backup power source having a limited amount of energy storage therein, such that said limited amount of energy that is stored is capable of powering said SRAM unit for only a limited period of time when said smart card device is out of said cradle and not powered by said transaction terminal;

means for rapidly zeroization of said SRAM unit after a select period of time has elapsed between removal of said card from said cradle without engaging said card in a transaction;

means to read a lasered read-only memory (ROM) identification block wherein said smart card has an ISO 7816 form factor.

16. The smart card device as set forth in claim 15, further including means for charging said backup power when said smart card device is powered by said transaction terminal.

17. The smart card device as set forth in claim 15, wherein said circuit comprises a symmetric-key cryptographic engine.

18. The smart card device as set forth in claim 15, wherein said circuit comprises an asymmetric-key cryptographic engine.

19. The smart card device as set forth in claim 15, further including oscillator and timer means coupled to an interface, said interface providing a signal communication path with said transaction terminal.

20. The smart card device as set forth in claim 19, wherein said interface comprises a standardized interface unit.

21. A card cradle, comprising:

a receptacle for accepting a ISO 7816 form factor card for storage, wherein said card includes a rechargeable energy source for powering a memory disposed on said card when said card is removed from said card cradle only for a short duration of time;

a second energy source for re-charging said first energy source when said card is received by said receptacle, and

a power control and regulation module coupled to said second energy source;

a real-time-clock and timer module coupled to said power control and regulation module;

a card interface module for coupling with said card when said card is received by said receptacle;

a controller coupled to each of said real-time-clock and timer module, said power control and regulation module and said card interface module for controlling signal communication therebetween; and

a lasered read-only memory (ROM) identification block coupled to said controller for identifying said card when presented to said card cradle for storage.

22. The card cradle as set forth in claim 21, further comprising means for generating an alarm when said card is removed from said card cradle for more than a select time period.

23. The card cradle as set forth in claim 21, further comprising means for receiving a panic mode indication from said card.

24. A method for providing information security on an ISO 7816 form factor card comprising an integrated circuit (IC), wherein said card is stored in a cradle when not in use, comprising the steps of:

providing a volatile storage unit on said card for storing cryptographic information;

providing a rechargeable power source on said card for powering said volatile storage unit when said card is removed from said cradle to effectuate a transaction at a terminal that is of sufficient size as to only power said volatile storage unit for a limited period of time and no longer;

providing parasitic power to recharge said rechargeable power source from said terminal when said card is presented to said terminal;

providing a primary power source associated with said cradle for charging said rechargeable power source when said card is repositioned in said cradle; and

providing a rapid zeroization of said volatile storage unit after a select period of time has elapsed between removal of said card from said cradle without engaging said card in a transaction

providing a lasered read-only memory (ROM) identification block coupled to said controller for identifying said card when presented to said card cradle for storage.

25. A system, comprising:

a card device for effectuating a transaction when presented to a transaction terminal, said card device including a SRAM memory and a rechargeable energy source, said rechargeable source for powering said memory for only a short period of time;

a card cradle carrier for storing said card device when said card device is not engaged in said transaction, said card cradle carrier formed of a substantially rigid material and forming at least a portion of a personal effect, wherein said card cradle carrier includes a second energy source for recharging said first energy source when said card device is received for storage by said card cradle carrier;

means for rapidly zeroization of said SRAM unit after a select period of time has elapsed between removal of said card from said cradle without engaging said card in a transaction and

a lasered read-only memory (ROM) identification block coupled to said controller for identifying said card when presented to said card cradle for storage.