Local authentication of mobile subscribers outside their home systems

• US 7,751,567 B2
• Filed: 06/01/2005
• Issued: 07/06/2010
• Est. Priority Date: 01/05/2001
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Quick, Roy F. Jr., Rose, Gregory G.
• Primary Examiner(s): Moorthy; Aravind K
• Application Number:
  US11/142,994
• Publication Number:
  US 20050257255A1
• Time in Patent Office: 1,861 Days
• Field of Search: 380/264, 380/247, 380/248, 380/270, 380/43, 380/278, 380/44, 380/47, 380/28, 713/150, 713/159, 713/161, 713/168, 713/171, 713/172, 713/176, 713/181, 713/185, 726/9, 455/403, 455/410, 455/411, 455/432.1
• US Class Current: 380/264
• CPC Class Codes: H04L 2209/56 Financial cryptography, e.g. electronic payment or e-cash
• CPC Class Codes: H04L 2209/80 Wireless network architectures or network communication protocols for wireless network security H04W12/00
• CPC Class Codes: H04L 63/0853 using an additional device, e.g. smartcard, SIM or a different communication terminal cryptographic mechanisms or cryptographic arrangements for entity authentication involving additional secure or trusted devices H04L9/3234
• CPC Class Codes: H04L 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 9/14 using a plurality of keys or algorithms
• CPC Class Codes: H04L 9/3234 involving additional secure or trusted devices, e.g. TPM, smartcard, USB or software token network architectures or network communication protocols for supporting authentication of entities using an additional device in a packet data network H04L63/0853
• CPC Class Codes: H04L 9/3247 involving digital signatures
• CPC Class Codes: H04L 9/3271 using challenge-response
• CPC Class Codes: H04W 12/06 Authentication
• CPC Class Codes: H04W 12/10 Integrity
• CPC Class Codes: H04W 12/128 Anti-malware arrangements, e.g. protection against SMS fraud or mobile malware
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

Methods and apparatus are presented for providing local authentication of subscribers traveling outside their home systems. A subscriber identification token 230 provides authentication support by generating a signature 370 based upon a key that is held secret from a mobile unit 220. A mobile unit 220 that is programmed to wrongfully retain keys from a subscriber identification token 230 after a subscriber has removed his or her token is prevented from subsequently accessing the subscriber'"'"'s account.

Claims

1. A subscriber identification token for providing local authentication of a subscriber in a visited communication system, comprising:

a memory; and

a processor configured to implement a set of instructions stored in the memory, the set of instructions for;

generating a plurality of keys in response to a received challenge, where at least one key from the plurality of keys is an integrity key that is provided to a communication unit communicatively coupled to the subscriber identification token and at least one key from the plurality of keys is an authentication key that is kept private from the communication unit;

generating an authentication signal based on a received signal and the authentication key from the plurality of keys, wherein the received signal is transmitted from the communications unit communicatively coupled to the subscriber identification token, and the received signal is generated by the communications unit using the integrity key from the plurality of keys; and

transmitting the authentication signal to the visited communication system via the communications unit, the authentication signal for authenticating the identity of the subscriber within the visited communication system.

4. The token of claim 1, the processor the configured to implement additional instructions stored in the memory, the additional instructions for:

assigning a weight to a transmission message at the mobile unit in accordance with a relative importance of the transmission message; and

wherein the authentication signal is generated and transmitted only if the assigned weight to the transmission message indicates that the transmission message is important,

otherwise, if the message is unimportant, the transmission message is transmitted without the authentication signal.

2. The token of 1, wherein the authentication signal is generated by a hash function.

3. The token of 2, wherein the hash function is the Secure Hash Algorithm (SHA-1).

5. A subscriber identification token for use by a subscriber in a mobile unit, the token comprising:

a key generation element for generating a plurality of keys, where at least one key from the plurality of keys is an integrity key that is provided to the mobile unit communicatively coupled to the subscriber identification token and at least one key from the plurality of keys is an authentication key that is kept private from the communication unit; and

a signature generator configured to receive the authentication key from the key generation element and a first signature from the mobile unit, where the first signature is based on the integrity key, the signature generator further configured to output a second signature to the mobile unit, wherein the second signature is generated based on the authentication key and the first signature and the second signature is for authenticating the identity of the subscriber.

6. The token of claim 5, comprising:

a memory; and

a processor configured to execute a set of instructions stored in the memory, wherein the set of instructions performs a cryptographic transformation upon an input value to produce a plurality of temporary keys.

7. The token of claim 6, wherein the cryptographic transformation is performed using a permanent key.

8. The token of claim 5, comprising:

a memory; and

a processor configured to execute a set of instructions stored in the memory, wherein the set of instructions performs a cryptographic transformation upon the information from the mobile unit by using the authentication key, wherein the signature results from the cryptographic transformation.

9. The subscriber identification token of claim 5, wherein a weight is assigned to a transmission message at the mobile unit in accordance with a relative importance of the transmission message, and the second signature is generated and transmitted only if the assigned weight of the transmission message indicates that the transmission message is important, otherwise, if the message is unimportant, the transmission message is transmitted without the second signature.

10. A method for providing authentication of a subscriber using a subscriber identification token within a mobile unit, comprising:

generating a plurality of keys at the subscriber identification token, where the plurality of keys includes a first key and a second key;

transmitting the first key from the plurality of keys to the mobile unit communicatively coupled to the subscriber identification token and keeping the second key private from the mobile unit;

generating a signature at the mobile unit using both the first key transmitted to the mobile unit and a transmission message;

transmitting the signature to the subscriber identification token;

receiving the signature at the subscriber identification token;

generating a primary signature from the received signature and the second key at the subscriber identification token; and

conveying the primary signature to a visited communication system, for authenticating the identity of the subscriber within the visited communication system.

11. The method of claim 10, wherein the generating of the signature signal is performed using a nonreversible operation.

12. The method of claim 10, wherein the generating of the signature signal is performed using DES.

13. The method of claim 10, wherein the generating of the signature signal is performed using a hash function.

14. The method of claim 13, wherein the hash function is SHA-1.

15. The method of claim 10, further comprising:

assigning a weight to the transmission message at the mobile unit in accordance with a relative importance of the transmission message; and

wherein transmitting the signature comprises;

transmitting the signature to a communications system if the assigned weight to the transmission message indicates that the transmission message is unimportant; and

transmitting the signature to the subscriber identification token if the assigned weight to the transmission message indicates that the transmission message is important.

16. A processor for use in a subscriber identification token for providing local authentication of a subscriber in a visited communication system, the processor configured to control:

generating a plurality of keys in response to a received challenge, where at least one key from the plurality of keys is an integrity key that is provided to a communications unit communicatively coupled to the subscriber identification token and at least one key from the plurality of keys is an authentication key that is kept private from the communications unit;

generating an authentication signal based on a received signal and the authentication key from the plurality of keys, wherein the received signal is transmitted from the communications unit communicatively coupled to the subscriber identification token, and the received signal is generated by the communications unit using the integrity key from the plurality of keys, and

transmitting the authentication signal to the visited communication system via the communications unit, the authentication signal for authenticating the identity of the subscriber within the visited communication system.

17. A subscriber identification token for providing local authentication of a subscriber in a visited communication system, comprising:

means for generating a plurality of keys in response to a received challenge, where at least one key from the plurality of keys is an integrity key that is provided to a communications unit communicatively coupled to the subscriber identification token and at least one key from the plurality of keys is an authentication key that is kept private from the communications unit;

means for generating an authentication signal based on a received signal and the authentication key from the plurality of keys, wherein the received signal is transmitted from the communications unit communicatively coupled to the subscriber identification token, and the received signal is generated by the communications unit using the integrity key from the plurality of keys; and

means for transmitting the authentication signal to the visited communication system via the communications unit, the authentication signal for authenticating the identity of the subscriber within the visited communication system.

18. A storage medium having one or more instructions operational on a subscriber identification token for providing local authentication of a subscriber in a visited communication system, which when executed by a processor causes the processor to:

generate a plurality of keys in response to a received challenge, where at least one key from the plurality of keys is an integrity key that is provided to a communications unit communicatively coupled to the subscriber identification token and at least one key from the plurality of keys is an authentication key that is kept private from the communications unit;

generate an authentication signal based on a received signal and the authentication key from the plurality of keys, wherein the received signal is transmitted from the communication unit communicatively coupled to the subscriber identification token, and the received signal is generated by the communications unit using the integrity key from the plurality of keys, and

transmit the authentication signal to the visited communication system via the communications unit, the authentication signal for authenticating the identity of the subscriber within the visited communication system.