Method and apparatus of antenna detection and authentication

• US 7,206,600 B2
• Filed: 12/26/2002
• Issued: 04/17/2007
• Est. Priority Date: 12/26/2002
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Reece, John K., Fox, Brian L., Reese, Timothy L., Scott, Doug D.
• Primary Examiner(s): Anderson; Matthew D.
• Assistant Examiner(s): Aminzay; Shaima Q.
• Application Number:
  US10/328,181
• Publication Number:
  US 20040127247A1
• Time in Patent Office: 1,573 Days
• Field of Search: 455/550.1, 455/13.3, 455/83, 455/562.1, 455/575.7, 455/121, 455/122, 455/123, 455/129, 455/13, 455/3, 455/127.5, 455/127.1, 455/127.2, 455/128, 455/352, 455/410, 455/411, 455/101, 455/1, 455/78, 455/558, 455/571, 455/88, 379/447, 379/433.05, 380/44, 380/46
• US Class Current: 455/550.1
• CPC Class Codes: G06F 2221/2129 Authenticate client device independently of the user
• CPC Class Codes: H01Q 1/242 specially adapted for hand-held use

Abstract

Briefly, a method and apparatus for decoding and authenticating an antenna is disclosed. The method may include detecting attachment of an antenna to a transmitter by authenticating a cipher received from the antenna. The method further includes suspending transmission if the antenna is not attached to the transmitter.

Claims

1. A method of authorizing use of antenna circuitry having an antenna element coupled to a cipher unit, the method comprising:

receiving from said antenna circuitry a cipher by said cipher unit based on a random challenge;

authenticating the cipher;

independently computing a second cipher;

comparing said independently computed second cipher with the first cipher received from said antenna circuitry;

authorizing a connection of said antenna circuitry to a transmitter if the second cipher is the same as the first cipher received from said antenna circuitry; and

transmitting a signal via said antenna element.

2. The method of claim 1, comprising:

wherein the antenna circuitry includes an antenna element and wherein the method further comprises;

determining a an antenna characteristic of said antenna element based on the ciphered message; and

controlling a power of a signal transmitted by said antenna element based on said determined antenna element characteristic.

3. The method of claim 2, wherein determining the antenna characteristic comprises:

determining a gain of said antenna element and generating a gain code corresponding to said antenna element gain.

4. The method of claim 2, wherein controlling further comprises:

sending said gain code; and

suspending providing said power to said transmitted signal when no valid response received for the sending of said gain code and wherein, lack of said valid response indicates at least one of a fault condition and detached antenna.

5. The method of claim 2, comprising:

suspending providing said power to said transmitted signal if said cipher is not authenticated.

6. The method of claim 1, further comprising decoding said cipher.

7. The method of claim 1, further comprising digitally signing an antenna serial number to produce said cipher.

8. The method of claim 1, further comprising:

generating a ciphered message based on said first cipher.

9. The method of claim 1, further comprising suspending providing said power to said transmitted signal if said first cipher does not match said second cipher.

10. The method of claim 8, wherein generating said cipher comprises:

generating said cipher by a hash; and

computing said random challenge using a key.

11. The method of claim 10, wherein authenticating comprise:

receiving a serial number from said antenna circuitry for selecting said key from a pre-stored set of keys.

12. The method of claim 10, wherein independently computing another cipher comprises computing said other cipher using a copy of said key.

13. A wireless communication device comprising:

a transmitter having a processing circuitry to;

receive from an antenna circuitry having an antenna element and a cipher unit a cipher provided by said cipher unit based on a random challenge;

authenticate the cipher;

independently compute a second cipher; and

compare said independently computed second cipher with the first cipher and to authorize a connection of said antenna circuitry to said transmitter if the second cipher is the same as the first cipher.

14. The wireless communication device of claim 13 wherein said antenna circuitry has a determinable antenna characteristic, and wherein said transmitter further comprises:

a processing circuitry able to receive a code corresponding to said antenna characteristic and to control a conducted power of said transmitter based on said code.

15. The wireless communication device of claim 14, wherein said determinable characteristic is a gain of said antenna element.

16. The wireless communication device of claim 15, wherein said antenna circuitry further comprises a memory chip for storing said code corresponding to said gain.

17. The wireless communication device of claim 15, wherein said processing circuitry is configured to suspend said conducted power when said code corresponds to a value of said gain that indicates a short circuit.

18. The wireless communication device of claim 15, wherein said processing circuitry is configured to suspend said conducted power when said code corresponds to a value of said gain that indicates an open circuit.

19. The wireless communication device of claim 16, wherein said memory chip of said antenna circuitry comprises said cipher unit, and wherein said processing circuitry is configured to authorize the attachment of said antenna circuitry based authentication of said cipher.

20. The wireless communication device of claim 19, wherein the antenna circuitry comprises a key and said cipher unit is configured to compute the first cipher based on said key.

21. The wireless communication device of claim 20, wherein said transmitter further comprises:

a random number generator to generate a random challenge; and

a copy key set to provide a copy of a key corresponding to said first cipher received from the antenna circuitry, wherein said processing circuitry is configured to compute an independent cipher based on the key copy.

22. The wireless communication device of claim 21, wherein said processing circuitry is configured to compare said first cipher to said independent computed cipher, and to suspend transmission of said transmitter if the independent cipher does not match the received cipher.