USRE44220E1 - Electronic identification system and method with source authenticity - Google Patents

Electronic identification system and method with source authenticity Download PDF

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USRE44220E1
USRE44220E1 US12479504 US47950409A USRE44220E US RE44220 E1 USRE44220 E1 US RE44220E1 US 12479504 US12479504 US 12479504 US 47950409 A US47950409 A US 47950409A US RE44220 E USRE44220 E US RE44220E
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data
transponder
algorithm
encoder
verifier
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Christopher Gordon Gervase Turner
Johan Dawid Kruger
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ZIH Corp
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ZIH Corp
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • GPHYSICS
    • G07CHECKING-DEVICES
    • G07CTIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00Individual entry or exit registers
    • G07C9/00007Access-control involving the use of a pass
    • G07C9/00103Access-control involving the use of a pass with central registration and control, e.g. for swimming pools or hotel-rooms, generally in combination with a pass-dispensing system
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00Cryptographic mechanisms or cryptographic arrangements for secret or secure communication
    • H04L9/32Cryptographic mechanisms or cryptographic arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
    • H04L9/3226Cryptographic mechanisms or cryptographic arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials using a predetermined code, e.g. password, passphrase or PIN

Abstract

An RF electronic identification system (10) is disclosed and claimed. The system includes at least one transponder encoder (14.1) for writing data into a memory arrangement (52) of a selected transponder (1.1) of a plurality of transponders (1.1 to 1.n) adapted to receive data from the at least one encoder. The system further includes at least one verifier (16) for interrogating a selected transponder (1.1) and to read data stored in the transponder. The encoder includes a controller (42) for providing an identification code characteristic of the encoder to form part of the data to be written into the transponder. The verifier includes computing means (56) for extracting the identification code from the data read thereby and for comparing the code to authorized codes. An indicator (18) provides an indication whether the identification code corresponds to any of the authorized codes or not. A method of verifying the authenticity of a transponder is also disclosed and claimed.

Description

This application is a continuation of application Ser. No. 10/827,814, filed Apr. 20, 2004 now U.S. Pat. No. 6,954,533, which is a continuation of application Ser. No. 09/334,151, filed Jun. 16, 1999 now U.S. Pat. No. 6,724,895, which application is incorporated herein by reference.

INTRODUCTION AND BACKGROUND

THIS invention relates to electronic identification systems and more particularly to such systems including radio frequency (RF) transponders and associated readers, interrogators and verifiers therefor.

A system of the aforementioned kind is typically used to mark and identify products or goods, and would further include a plurality of encoder units for writing data into respective memory arrangements of the transponders. In use, a transponder is attached to a product item and the data written into the transponder may relate to the kind of product, the date of manufacture and/or any other data relating to the product. Normally the data is written into the memory arrangement at the source of the product, but in some applications additional data may be written into the memory arrangement at various points along a distribution chain. Of course the data written into the memory arrangement can at any stage be read with a verifier, interrogator or reader.

In some applications, security arrangements are required which would prevent unauthorized parties from attaching non-genuine transponders (purporting to store data encoded by an authorised encoder) to grey or infringing goods, thereby facilitating passing the grey goods off as genuine goods.

OBJECT OF THE INVENTION

Accordingly, it is an object of the present invention to provide a system and method with which the applicant believes transponders originating from an authorized source could be distinguished from non-genuine transponders.

SUMMARY OF THE INVENTION

According to the invention there is provided an electronic identification system, the system including:

    • at least one transponder encoder for writing data into a memory arrangement of a transponder;
    • a plurality of transponders adapted to receive data from the at least one encoder;
    • at least one verifier for interrogating a selected transponder and to read data stored in the transponder;
    • said encoder including means for providing an identification code characteristic of an entity externally of the transponder, to form part of the data to be written into the transponder;
    • the verifier including computing means for extracting the identification code from the data read thereby and for comparing the code to an authorized code; and indicator means for giving an indication whether the identification code corresponds to the authorized code.

The identity code is preferably characteristic of the encoder.

The encoder may include a memory arrangement wherein a plurality of identification codes for the encoder are stored and the means for providing an identification code may include a controller for randomly selecting one of the authorized codes.

The system may further include a central computer for generating the plurality of identification codes and for downloading the identification codes into the at least one encoder and into the at least one verifier, to constitute corresponding authorized codes.

The controller of the encoder may further include encryption means utilizing a first encryption algorithm and the identification code in a first encryption process, to provide encrypted data relating to the identification code, to form part of the data to be written into the transponder.

In a preferred embodiment the controller of the encoder is programmed randomly to select the first encryption algorithm from a first set of encryption algorithms pre-stored in the memory arrangement of the encoder.

Each encryption algorithm may be associated with a unique algorithm address in the memory arrangement of the encoder.

The algorithms may be downloaded from the central computer into the encoder upon start-up of the encoder. The algorithms are preferably also downloaded into memory locations of the verifier having corresponding addresses.

Each algorithm may include a function of at least one physical characteristic of the transponder, for example a clock frequency of circuitry of the transponder. The algorithm may be of a general form wherein the selected identification code is equal to at least one function of a suitable physical characteristic of the transponder plus a first remainder.

The data relating to the identification code and which forms part of the data to be written into the transponder may include the aforementioned first remainder. Preferably it consists of the first remainder only.

Data relating to the algorithm address of the selected algorithm may also be included in the data to be written into the memory arrangement of the transponder. The controller of the encoder may utilize a second algorithm and the data relating to the address in a second encryption process, to yield encrypted data relating to the algorithm address. The second algorithm may be of a general form wherein the algorithm address is equal to at least one function of an independent variable plus a second remainder.

The encrypted data relating to the algorithm address and which forms part of the data to be written into the transponder may include the aforementioned second remainder. Preferably it consists of the second remainder only.

The verifier may include computing means adapted to use the second algorithm to decrypt the encrypted data relating to the address for the first algorithm.

The computing means may further be programmed to retrieve the first algorithm, to input data relating to the physical characteristics of the transponder and to use said data and the first algorithm to decrypt the data relating to the identification code, to yield an output code.

The computing means of the verifier may further include a comparator for comparing the output code to the authorized codes which are stored in the memory arrangement of the verifier.

The indicating means of the verifier may include a display.

The verifier may form part of a reader for the transponders. Alternatively, it may be a separate unit.

Also included within the scope of the present invention is a method of verifying the authenticity of a transponder, the method including the steps of:

    • writing data into the transponder by an authorized transponder encoder;
    • including in the data, data relating to an identification code of an entity externally of the transponder;
    • reading the data written into the transponder with a verifier;
    • extracting from the data read, the data relating to the identification code;
    • comparing the extracted data to data relating to an authorised identification code for the entity; and
    • providing an indication whether the extracted data matches the data relating to authorized identification code.

The identification code may be characteristic of the encoder.

The encoder may have a plurality of identification codes associated therewith and the method may include the step of randomly selecting one of these codes for inclusion in the data to be written into the transponder.

Further according to the method of the invention a first encryption algorithm and the selected identification code may be used in a first encryption process to yield encrypted data relating to the identification code. Preferably the first algorithm is selectable from a first set of encryption algorithms. The algorithms may include a function of at least one physical characteristic of the transponder into which the data is to be written.

Each of the first set of encryption algorithms may be accessible by the encoder from a memory arrangement thereof utilizing a respective algorithm address. The method may include the further step of including data relating to the algorithm address of the selected algorithm in the data to be written into the transponder. A second algorithm and data relating to the address of the selected algorithm may•be' utilized in a second encryption process to yield encrypted data relating to the algorithm address for inclusion in the data to be written into the transponder.

The method may further include the step of utilizing at the verifier the data relating to the algorithm address to retrieve from a memory arrangement of the verifier the algorithm utilized during the first encryption process.

The method may further include the steps of: providing computing means in the verifier with data relating to the physical characteristics of the transponder; and utilizing said data and the retrieved algorithm to decrypt the encrypted data relating to the identification code.

The method may still further include the step of comparing the decrypted data relating to the identification code to the data relating to authorized identification codes stored in a memory arrangement of the verifier.

Also included within the scope of the invention is a method of programming data into a transponder, the method including the steps of:

    • electronically measuring a physical characteristic of the transponder and producing data relating thereto;
    • utilizing the produced data in an encryption algorithm to encrypt data to be written into the transponder; and
    • writing the encrypted data into a memory arrangement of the transponder.

The physical characteristic may be the frequency of a clock of the transponder and may be measured by receiving a response signal from the transponder and utilizing the received signal to measure the clock frequency. The encrypted data may be written into the transponder by transmitting it to the transponder.

BRIEF DESCRIPTION OF THE ACCOMPANYING DIAGRAMS

The invention will now further be described, by way of example only, with reference to the accompanying diagrams wherein:

FIG. 1 is a basic block diagram of a system according to the invention;

FIG. 2 is a block diagram showing an encoder, a transponder and a verifier forming part of the system in more detail; and

FIG. 3 is a basic flow diagram of a decoding process forming part of the method according to the invention.

DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION

An electronic identification system according to the invention is generally designated by the reference numeral 10 in FIG. 1.

The system 10 includes a central computer system 12 which manages and controls the rest of the system. The system 10 further includes a plurality of transponder encoders 14.1 to 14.3 adapted to be brought into communication with the central computer to be programmed thereby. In use, each encoder is preferably located at a source (not shown) or manufacturing plant of products to which transponders are to be secured, to program such transponders by writing data into the transponders. Each encoder has at least one, preferably eight plain-text identification (PTID) numbers or codes characteristic thereof. For example, the PTID'S associated with encoder 14.1 are numbers 121 to 128. These numbers are generated and issued by the central computer and stored in memory arrangements of each of the central computer 12, the relevant encoder and verifiers, which will be referred to hereinafter. Also stored in the central computer for downloading into the encoders and the verifiers respectively, are algorithms for encrypting data to be written into the transponders by the encoders and for decrypting the data by verifiers or readers, as will hereinafter be described. The PTID's and algorithms may from time to time be changed by the central computer 12 by downloading new numbers and algorithms, to maintain and improve the integrity and security of the system.

The system further includes a plurality of radio frequency (RF) transponders. Transponders 1.1 to 1.n are associated with encoder 14.1, transponders 2.1 to 2.n with encoder 14.2 and transponders 3.1 to 3.n with encoder 14.3.

The system still further includes a plurality of verifiers or readers (only one of which is shown at 16 in FIG. 1). The verifier includes display means 18 for displaying the outcome of an authenticity verification procedure performed in use by the verifier 16 on any of the transponders, in respect of the authenticity of an encoder used to program that transponder.

The encoders 14.1 to 14.3 are similar and therefore only encoder 14.1 will be described in more detail herebelow with reference to FIG. 2. Encoder 14.1 includes an RF transceiver 40, a controller 42 and a memory arrangement 44. Memory arrangement 44 includes a plurality of storage locations each addressable by the controller by a unique address ADD#OO to ADD#nn. The aforementioned PTID codes of the encoder 14.1, once downloaded by the central computer 12, are stored in respective ones of these locations. The aforementioned encryption algorithms or data relating thereto are also stored in respective ones of these locations and are directly or indirectly retrievable by the controller 42 by the respective addresses.

The transponders are also similar and therefore only transponder 1.1 will be described in more detail. Transponder 1.1 includes an RF transceiver 46, control circuitry 48, a clock 50 having a clock frequency fc and a memory arrangement 52.

Verifier 16 may form part of a reader (not shown) for the transponders, or may be a separate unit. The verifier 16 includes an RF transceiver 54, computing means 56, display 18 and a memory arrangement 58. The memory arrangement 58 includes a plurality of storage locations each addressable by the computing means 56 by a unique address ADD#OO to ADD#nn. The aforementioned PTID codes of the encoders are received from the central computer and stored in respective ones of these locations. The aforementioned encryption/decryption algorithms are similarly received from the central computer and stored in respective locations, or data relating to the algorithms may be stored in these locations. The algorithms are directly or indirectly retrievable by the computing means 56 by their respective addresses.

In use and as is well known in the art, a selected transponder 1.1 is brought into range of a programmed encoder 14.1. Data including data relating to the product to which the transponder is to be applied is transmitted via an RF link including transceiver 40, antenna 41, antenna 47 and transceiver 46 to the transponder. The transponder receives that data and stores the data in memory arrangement 52 forming part of the transponder. Along the distribution chain of the product, further data may similarly be written into the memory arrangement 52.

As is also well known in the art, the data may at any stage be read by a reader or verifier 16 in known manner. The verifier 16 transmits an RF energizing signal 62 to the transponder 1.1 and a virtual battery forming part of the transponder circuitry 54 is charged. The transponder responds by backscatter modulating on the energizing signal serving as carrier, a data stream including the data stored in the memory arrangement 52 and timed by the frequency fc of the clock 50. The verifier 16 in turn receives this data and may be adapted in known manner to switch the transponder just read to a sleep or the like mode, which causes the transponder to stop modulating the energizing signal.

It will be appreciated that with such a conventional system an unauthorized distributor of pirate, grey or otherwise infringing goods may simply attach a non-genuine transponder (carrying data similar to the data carried by transponders attached to genuine goods) to the grey goods. Unless sophisticated security mechanisms and methods are employed, such grey goods will not easily be identified or traced.

According to the invention, encrypted data relating to a selected one of the PTID numbers of the source encoder 14.1 is written into and stored as part of the data stored in the memory arrangement 52 of the transponder. To achieve this, the encoder controller is adapted randomly to select anyone of the eight PTID numbers. This PTID number and a selected one of the encryption algorithms are utilized by encryption means forming part of the controller in a first encryption process, to yield encrypted data relating to the PTID number. At least some of the variables to be used with the encryption algorithm are functions of measurable physical characteristics of the transponder 1.1, such as the frequency fc of the transponder clock 50. The clock frequency fc is determined from a response signal from the transponder during the programming process.

The verifier 16 in turn is adapted (as will hereinafter be described) to retrieve the relevant decryption algorithm from its memory arrangement 58, to determine the relevant physical properties of the transponder concerned and to decipher the encrypted data into a plain-text number. If the deciphered plain-text number is equal to an authorized PTID number stored in the memory arrangement 58 of the verifier 16, an “AUTHENTIC” message is displayed on display 18. If the result of the deciphering process does not correspond to an authorized PTID, a “FALSE” message is displayed.

The encryption algorithm may be of the general form:
PTID=a.f(x)+b.f(y)+c.f(z)+rem   —A
wherein

    • PTID is the selected PTID number of the encoder;
    • a, b and c are scaling constants;
    • x, y z are independent variables, preferably relating to physical characteristics of the transponder being programmed; and
    • rem is a remainder.

The encrypted data relating to the PTID of the encoder 14.1 and which is subsequently stored in the transponder 1.1, is preferably the remainder (rem) part only, of the above encryption process. The rem-data may be four bits in length.

As stated hereinbefore, a randomly selected first algorithm of a first set of encryption algorithms stored in the encoder 14.1 and correspondingly stored in the verifier 16 may be used to encrypt the PTID number of the encoder which is, as stated hereinbefore, randomly selected by the encoder from the available PTID numbers therefor. Data relating to the address where the selected first algorithm is stored and a second algorithm are used in a second encryption process, to yield encrypted data relating to the address of the selected first algorithm. The second algorithm is of the following general form:
AAD=d.f(m)+e.f(n)+REM   —B
wherein

    • AAD is the address of the selected first algorithm;
    • d, e and g are scaling constacts;
    • m, n and o are independent variables; and
    • REM is a remainder.

The encrypted data relating to the address of the first encryption algorithm and which is to be stored in the transponder 1.1, is preferably the remainder (REM) part only of the aforementioned second encryption process. The REM-data may be four bits in length.

The data stored in the memory arrangement 52 of transponder 1.1 and which is backscatter modulated in the form of a data stream on the energizing signal 62 during a reading or verification process of the transponder, is diagrammatically illustrated in FIG. 3.

The data stream is designated 20 in FIG. 3. The REM-data 22 is utilized together with equation 8 as shown at 24, to calculate the address of the first encryption algorithm used by the encoder 14.1 to provide encrypted data relating to the randomly selected PTI number of the encoder. This address is utilized by the computing means 56 to retrieve the first algorithm from the memory arrangement 58 forming part of the verifier.

The aforementioned first algorithm, the rem-data 26 in the data stream 20 and input data 28 relating to physical characteristics (in this sample the frequency fc of the clock 50) of the transponder are utilized by the verifier 16 to calculate a plain-text output number at 30.

The plain-text output number is fed at 32 to a comparator of the computing means 56, to compare the number to a list of authorized PTID numbers stored in the memory arrangement 58 of the verifier. If the output number corresponds to one of the authorized PTID numbers, the verifier displays on display 18 the message “AUTHENTIC”. This would indicate that the transponder 1.1 has been programmed with an authorized encoder 14.1 at the source of the product. If the output number does not so correspond, it would mean that the transponder 1.1 includes fake data and has not been programmed at an authorized source of the particular product. A “FALSE” message would then be displayed on display 18.

It will be appreciated that there are many variations in detail on the method and system according to the invention without departing from the scope and spirit of the appended claims.

Claims (34)

The invention claimed is:
1. An electronic identification system including:
at least one transponder encoder for writing data to a transponder;
said encoder comprising means for providing an identification code characteristic of an entity externally of external to the transponder;
a plurality of transponders each adapted to receive data from the at least one encoder and to store the data received in a respective memory arrangement of the transponder;
at least one verifier for interrogating a selected transponder and to read reading data stored in the memory arrangement of the selected transponder via a radio frequency link;
wherein said encoder further comprises an encryption device for utilizing an algorithm and input data characteristic of the encoder to generate encrypted data to form at least part of the data written to the selected transponder;
the at least one verifier comprises comprising computing means for extracting and deciphering the encrypted data from the data read thereby; and
a comparator for comparing the deciphered data to authorized data and
an indicator for providing an indication of an outcome of the comparison.
2. A system as claimed in claim 1, wherein the encoder includes a memory arrangement wherein configured to store a plurality of identity identification codes characteristic of the encoder are stored; and wherein the encoder comprises a controller for randomly selecting one of a selected identification code from said plurality of identification codes for use as the input data by the encryption device.
3. A system as claimed in claim 2 further including a central computer for generating the plurality of identification codes, for downloading the identification codes into the memory arrangement of the encoder and into a memory arrangement of the at least one verifier.
4. A system as claimed in claim 2 wherein the algorithm comprises a first encryption algorithm and wherein the encryption device utilizes the selected identification code and the first encryption algorithm to generate the encrypted data.
5. A system as claimed in claim 4 wherein the controller of the encoder is programmed randomly to configured to select the first encryption algorithm from a first set of encryption algorithms pre-stored in the memory arrangement of the encoder.
6. A system as claimed in claim 5 wherein each algorithm in the first set of encryption algorithms is associated with a respective algorithm address in the memory arrangement of the encoder.
7. A system as claimed in claim 6 wherein the encrypted data further comprises encrypted address data relating to the respective algorithm address of the selected first encryption algorithm.
8. A system as claimed in claim 7 wherein the encryption device utilizes a second encryption algorithm and said data relating to the respective algorithm address to generate the encrypted address data.
9. A system as claimed in claim 8 wherein the second algorithm is of a general form wherein the respective algorithm address is equal to at least one term plus a second remainder.
10. A system as claimed in claim 9 wherein the encrypted address data comprises the aforementioned second remainder.
11. A system as claimed in claim 4 1 wherein each encryption the algorithm includes comprises at least one term which that is a function of at least one physical characteristic of the selected transponder into onto which the data is to be written.
12. A system as claimed in claim 11 wherein the at least one physical characteristic of the selected transponder is a frequency of a clock forming part of the transponder.
13. A system as claimed in claim 11 wherein each algorithm is of a general form wherein the selected identification code is equal to said at least one term plus a first remainder.
14. A system as claimed in claim 13 wherein the encrypted comprises the aforementioned remainder.
15. A system as claimed in claim 8 wherein the computing means of the verifier is configured to use the second encryption algorithm to decrypt the encrypted address data to yield the respective algorithm address data.
16. A system as claimed in claim 15 wherein the computing means of the verifier is configured to utilize the respective algorithm address data to retrieve the selected first encryption algorithm, to obtain input data and to use said input data and the first encryption algorithm to decrypt the encrypted data to yield decrypted data when deciphering the encrypted data and generating the deciphered data.
17. A system as claimed in claim 16 wherein the comparator forms part of the verifier and is configured to compare the decrypted deciphered data to the authorized identification codes data which are is stored in the memory arrangement of the verifier.
18. A method of verifying the authenticity of a transponder, the method including the steps of:
generating encrypted data utilizing an algorithm and input data characteristic of a transponder encoder;
writing the encrypted data and data relating to an identification code of an entity externally of external to the transponder into the transponder utilizing the transponder encoder;
reading the data written into the transponder with a verifier via a radio frequency link extending between the verifier and the transponder;
extracting from the data read, the encrypted data; decipher, deciphering the encrypted data to generate deciphered data using computing means of the verifier; and
comparing the deciphered data to authorized data and
providing an indication based on the comparison.
19. A method as claimed in claim 18 wherein the input data comprises an identification code characteristic of the encoder.
20. A method as claimed in claim 19 wherein the transponder encoder has a plurality of identification codes characteristic thereof and wherein the method includes the step of randomly selecting one of these the plurality of identification codes as said the input data.
21. A method as claimed in claim 18 wherein the step of generating encrypted data comprises the step of utilizing a first encryption algorithm and the identification code to generate the encrypted data relating to the identification code.
22. A method as claimed in claim 21 wherein the first encryption algorithm is selectable from a first set of encryption algorithms.
23. A method as claimed in claim 22 wherein the first encryption algorithm includes at least one term which that is a function of at least one physical characteristic of the transponder into which the data is written.
24. A method as claimed in claim 23 wherein each algorithm of the first set of encryption algorithms is accessible by the encoder from a memory arrangement thereof utilizing a respective algorithm address.
25. A method as claimed in claim 24 wherein the step of generating encrypted data comprises the step of utilizing a second encryption algorithm and data relating to the respec tive algorithm address of the selected algorithm, to generate encrypted data relating to the respective algorithm address.
26. A method as claimed in claim 25 including the step of utilizing at the verifier decrypted data relating to the respective algorithm address to retrieve from a memory arrangement of the verifier the first encryption algorithm utilized during the first encryption process.
27. A method as claimed in claim 26 comprising the steps of providing to computing means in the verifier input data; and utilizing said input data and the retrieved first encryption algorithm to decrypt the encrypted data relating to the identification code.
28. A method as claimed in claim 27 wherein the step of comparing comprises the step of comparing the decrypted data relating to the identification code to data relating to authorized identification codes stored in a memory arrangement of the verifier.
29. A method of verifying the authenticity of a transponder comprising:
receiving, at a computing means, encrypted data and input data relating to a physical characteristic of the transponder;
applying an algorithm to the encrypted data and the input data, using the computing means, to generate an output number; and
comparing, using the computing means, the output number to a list of numbers.
30. The method of claim 29, wherein the transponder comprises a clock defining a clock frequency, and wherein the input data relating to a physical characteristic of the transponder comprises the clock frequency.
31. The method of claim 29, wherein the list of numbers comprises a plurality of identification numbers characteristic of an entity external to the transponder.
32. The method of claim 29, wherein the list of numbers comprises a plurality of identification numbers characteristic of an encoder.
33. The method of claim 29, wherein the computing means is part of a reader.
34. A reader configured to authenticate a transponder, the reader comprising:
an RF transceiver; and
computing means configured to:
receive encrypted data and input data relating to a physical characteristic of the transponder via the RF transceiver;
apply an algorithm to the encrypted data and the input data to generate an output number; and
compare the output number to a list of numbers.
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US09334151 US6724895B1 (en) 1998-06-18 1999-06-16 Electronic identification system and method with source authenticity verification
US10827814 US6954533B2 (en) 1998-06-18 2004-04-20 Electronic identification system and method with source authenticity
US11247959 US7228433B2 (en) 1998-06-18 2005-10-11 Electronic identification system and method with source authenticity
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