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Contact-less tag with signature, and applications thereofContact-less tag with signature, and applications thereof description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090160615, Contact-less tag with signature, and applications thereof. Brief Patent Description - Full Patent Description - Patent Application Claims
This application is a continuation, and claims the benefit under 35 USC 120, of International Application No. PCT/CA2007/002343 filed on Dec. 20, 2007 and hereby incorporated by reference herein. The present invention relates generally to contact-less tags and, more specifically, to a contact-less tag having a signature as well as to applications using the properties of such a tag. Contact-less tags, such as radio frequency identification (RFID) tags, are becoming increasingly commonplace in various commercial applications, two non-limiting examples of which include access control and inventory management. An RFID tag affixed to an item stores a code (e.g., a bit pattern) that is output in contact-less fashion to a reader, either in response to a request from the reader or autonomously by the tag. The reader captures the bit pattern and then an action may be taken, depending on the commercial application at hand. For example, in an access control scenario, the captured bit pattern may reveal that the person presumed to be carrying the tag (by virtue of an association with the bit pattern) is—or is not—authorized to enter a building or operate a vehicle. In an inventory management scenario, the bit pattern may give an indication of items contained on a pallet, for example, which may result in certain decisions being taken regarding shipping or storage of these items. In both cases, the ease with which an RFID tag may be read by a reader enables rapid processing but also may lead to problems. In the access control scenario, for example, an RFID tag of an individual authorized to access certain property may be interrogated and then the bit pattern cloned for use by an impostor to gain what is in fact unauthorized access to such property. Similarly, in the inventory management scenario, an acquired knowledge of the bit pattern associated with a certain item may allow a malicious party to gain intelligence about inventory locations that the item\'s rightful owner (which may include the manufacturer all the way down to the retail customer) may wish to keep secret. In both of the above scenarios, it is apparent that what is relevant to a malicious party is the knowledge that a certain bit pattern output by a certain RFID tag will either give access to property or indicate the presence of a specific inventory item. Whether the bit pattern is itself an encrypted version of some original data is actually of no relevance to the malicious party. Thus, schemes based on straightforward encryption of the bit pattern do not mitigate the problems mentioned above. Against this background, there is clearly a need in the industry for a contact-less tag having improved properties. A first broad aspect of the present invention seeks to provide a method, which comprises generating a first signature by encoding an identifier with a first additional data set at a first time instant; responding to a first read request from a tag reader by releasing the first signature; generating a second signature by encoding the identifier with a second additional data set at a second time instant, the second additional data set being different from the first additional data set; and responding to a second read request by releasing the second signature. A second broad aspect of the present invention seeks to provide an apparatus, which comprises means for generating a first signature by encoding an identifier with an additional data set at a first time instant; means for responding to a first read request from a tag reader by releasing the first signature; means for generating a second signature by encoding the identifier with a second additional data set at a second time instant, the second additional data set being different from the first additional data set; and means for responding to a second read request from a tag reader by releasing the second signature. A third broad aspect of the present invention seeks to provide a computer-readable medium, which comprises computer-readable program code which, when interpreted by a computing apparatus, causes the computing apparatus to execute a method. The computer-readable program code comprises first computer-readable program code for causing the computing apparatus to generate a first signature by encoding an identifier with an additional data set at a first time instant; second computer-readable program code for causing the computing apparatus to respond to a first read request from a tag reader by releasing the first signature; third computer-readable program code for causing the computing apparatus to generate a second signature by encoding the identifier with a second additional data set at a second time instant, the second additional data set being different from the first additional data set; and fourth computer-readable program code for causing the computing apparatus to respond to a second read request from a tag reader by releasing the second signature. A fourth broad aspect of the present invention seeks to provide a device for use in contact-less communication with a reader, which comprises a memory configured to store a first signature generated by encoding an identifier with a first additional data set at a first time instant; and a controller configured to generate a new signature by encoding the identifier with a second additional data set at a second time instant, the second additional data set being different from the first additional data set. The controller is further configured to cause the new signature to be stored in the memory after the second time instant. A fifth broad aspect of the present invention seeks to provide a device for use in contact-less communication with a reader, which comprises a memory configured to store a signature that encodes a pre-determined identifier; a transceiver configured to contactlessly receive read requests from the reader and to contactlessly transmit responses thereto; a controller configured to respond to read requests received via the transceiver by releasing via the transceiver a current version of the signature stored in the memory, wherein the version of the signature stored in the memory varies over at least two time instants while continuing to encode the pre-determined identifier; and a power source for powering at least the controller. These and other aspects and features of the present invention will now become apparent to those of ordinary skill in the art upon review of the following description of specific embodiments of the invention in conjunction with the accompanying drawings. Continue reading about Contact-less tag with signature, and applications thereof... Full patent description for Contact-less tag with signature, and applications thereof Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Contact-less tag with signature, and applications thereof patent application. Patent Applications in related categories: 20090278661 - Hybrid ultrasonic and radio frequency identification system and method - A radio frequency identification system and method includes a tag reader and radio frequency identification tag. The tag reader includes an ultrasonic transducer capable of transmitting tones at selected ultrasonic frequencies and a radio transmitter capable of transmitting signals at selected radio frequencies. The tag reader includes a radio receiver ... 20090278661 - Hybrid ultrasonic and radio frequency identification system and method - A radio frequency identification system and method includes a tag reader and radio frequency identification tag. The tag reader includes an ultrasonic transducer capable of transmitting tones at selected ultrasonic frequencies and a radio transmitter capable of transmitting signals at selected radio frequencies. The tag reader includes a radio receiver ... 20090278664 - Radio frequency identification (rfid) tag encryption method and system using broadcast encryption (be) scheme - A radio frequency identification (RFID) tag encryption method and system using a broadcast encryption (BE) scheme are provided by encrypting an ID of an RFID tag, storing the encrypted ID in a server and the RFID tag, and storing information relating to a reader authorized to read out the RFID ... 20090278664 - Radio frequency identification (rfid) tag encryption method and system using broadcast encryption (be) scheme - A radio frequency identification (RFID) tag encryption method and system using a broadcast encryption (BE) scheme are provided by encrypting an ID of an RFID tag, storing the encrypted ID in a server and the RFID tag, and storing information relating to a reader authorized to read out the RFID ... 20090278663 - Rfid tag information system - The disclosure discloses a RFID tag information system comprising a transmission/reception antenna configured to carry out information transmission/reception via radio communication with a RFID circuit element; an access information processing device configured to carry out predetermined processing relating to information for access that accesses the RFID circuit element or access ... 20090278663 - Rfid tag information system - The disclosure discloses a RFID tag information system comprising a transmission/reception antenna configured to carry out information transmission/reception via radio communication with a RFID circuit element; an access information processing device configured to carry out predetermined processing relating to information for access that accesses the RFID circuit element or access ... 20090278662 - System and method for determining the position of instrumented biological agents - A system for determining the position of instrumented biological agents including a plurality of biological agents each having a miniature transmitter/receiver attached thereto. A plurality of antenna is placed about an area of interest. An interrogator subsystem is configured to determine the position of each miniature transmitter/receiver on each of ... 20090278662 - System and method for determining the position of instrumented biological agents - A system for determining the position of instrumented biological agents including a plurality of biological agents each having a miniature transmitter/receiver attached thereto. A plurality of antenna is placed about an area of interest. An interrogator subsystem is configured to determine the position of each miniature transmitter/receiver on each of ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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