Granted Patent B2

US 8,138,889 · App. 11/819,132 · Granted Mar 20, 2012

Abstract

Claims (46)

1. A method comprising:

transmitting a first code, by a transponder, in response to receiving a first request from a base station;

receiving first encoded transmission information from the base station, the first encoded transmission information comprising a base station code encoded using the first code and a first identification;

extracting the base station code from the first encoded transmission information using the first code and the first identification;

transmitting a second code in response to receiving a second request from the base station, the second code encoded using the extracted base station code;

receiving second encoded transmission information from the base station, the second encoded transmission information comprising a second identification encoded by the base station using the second code;

extracting the second identification from the second encoded transmission information using the second code; and

comparing the extracted second identification to a stored version of the second identification, access to

at least one memory region of the transponder provided based on the comparing of the extracted second identification.

2. The method of claim 1 , further comprising generating one or more of the first code and the second code using random numbers.

3. The method of claim 1 , wherein the encoding of the second code is performed using an XOR operation.

4. The method of claim 1 , wherein extracting the base station code further comprises accessing the first identification stored in a memory.

5. The method of claim 1 , wherein comparing the extracted second identification comprises accessing the stored version of the second identification stored in a memory.

6. The method of claim 1 , further comprising acknowledging receipt of the first encoded transmission information by transmitting a handle.

7. The method of claim 6 , further comprising receiving the second request after transmitting the handle.

8. A circuit configured to:

transmit a first code, by a transponder, in response to receiving a first request from

a base station;

receive first encoded transmission information from the base station,

the first encoded transmission information comprising a base station code encoded using the first code and a first identification;

extract the base station code from the first encoded transmission information using the first code and the first identification;

transmit a second code in response to receiving a second request from the base station, the second code encoded using the extracted base station code;

receive second encoded transmission information, from the base station, the second encoded transmission information comprising a second identification encoded using the second code;

extract the second identification from the second encoded transmission information using the second code; and

compare the extracted second information to a stored version of the second identification, access to at least one memory region of the transponder provided based on the comparing of the extracted second identification.

9. The circuit of claim 8 , wherein the apparatus is further configured to generate the one or more of the first code and the second code using random numbers.

10. The circuit of claim 8 , wherein the circuit is further configured to encode the second code using an XOR operation.

11. The circuit of claim 8 , wherein the circuit is further configured to access the first identification stored in a memory.

12. The circuit of claim 8 , wherein the circuit is further configured to access the stored version of the second identification stored in a memory.

13. The circuit of claim 8 , wherein the circuit is further configured to acknowledge receipt of the first encoded information by transmitting a handle.

14. An apparatus comprising:

a memory area; and

one or more computer-readable non-transitory storage media coupled to memory area that embody logic that is configured when executed to:

transmit a first code by a transponder in response to receiving a request from a base station;

receive first encoded transmission information from the base station, the first encoded transmission information comprising a base station code encoded using the first code and a first identification;

extract the base station code from the first encoded transmission using the first code and the first identification;

transmit a second code in response to receiving a second request from the base station, the second code encoded using the extracted base station code;

receive second encoded transmission information from the base station, the second encoded information comprising a second identification encoded by the base station using the second code;

extract the second identification is extracted by the transponder from the second encoded transmission information and verified, and

compare the extracted second identification to a stored version of the second identification, access to at least one memory region provided based on the comparing of the extracted second identification.

15. The apparatus of claim 14 , wherein the logic is further configured to generate one or more of the first code and the second code using random numbers.

16. The apparatus of claim 14 , wherein the logic is further configured to encode the second code using an XOR operation.

17. The apparatus of claim 14 , wherein the logic is further configured to access the first identification stored in a memory.

18. The apparatus of claim 14 , wherein the logic is further configured to access the stored version of the second identification stored in a memory.

19. The apparatus of claim 14 , wherein the logic is further configured to acknowledge receipt of the first encoded information by transmitting a handle.

20. The apparatus of claim 19 , wherein the logic is further configured to receive the second request after transmitting the handle.

Assignments (11)