Transponder system for transmitting key-encrypted information and associated keys
First Claim
Patent Images
1. A radio frequency identification (RFID) transponder comprising:
- at least one memory that is configured to store both encrypted information that has been encrypted by use of a key and the key necessary to decrypt the stored encrypted information; and
a transmitter that is configured to separately transmit, in response to queries of a reading device, the stored key by a slowly readable route and the stored encrypted information by a first fast readable route, wherein the slowly readable route and the first fast readable route are different routes, with data transmitted over the slowly readable route having a lower transmission speed than data transmitted over the first fast readable route, and send unencrypted information via a second fast readable route, separate from the first fast readable route for the stored encrypted information, with data transmitted over the slowly readable route having a lower transmission speed than data transmitted over the second fast readable route, with all transmitted data, the stored key, the stored encryption information, and the unencrypted information transmitted from the transponder to the reading device;
a random number generator that is configured to generate random numbers; and
an encryptor that is configured to compute randomized encrypted information utilizing the generated random numbers, wherein with every encryption of a message M using key K, a random string R is generated, and the encryption is a function F using K and R to encrypt M.
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Abstract
A transponder (1) comprises at least one memory (MEM1, MEM2) for storing encrypted information (E_k(EPC, PI)) that has been encrypted by use of a key (k) and for storing the key (k) associated with the encrypted information (E_k(EPC, PI)). The transponder (1) is adapted to send the key (k) slower response than the encrypted information (E_k(EPC, PI)) in response to queries of a reading device (2), which is preferably done by delaying the transmission of the key (k) or by limiting the response rate at which the key (k) is transmitted. In particular the invention is related to RFID systems.
38 Citations
13 Claims
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1. A radio frequency identification (RFID) transponder comprising:
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at least one memory that is configured to store both encrypted information that has been encrypted by use of a key and the key necessary to decrypt the stored encrypted information; and a transmitter that is configured to separately transmit, in response to queries of a reading device, the stored key by a slowly readable route and the stored encrypted information by a first fast readable route, wherein the slowly readable route and the first fast readable route are different routes, with data transmitted over the slowly readable route having a lower transmission speed than data transmitted over the first fast readable route, and send unencrypted information via a second fast readable route, separate from the first fast readable route for the stored encrypted information, with data transmitted over the slowly readable route having a lower transmission speed than data transmitted over the second fast readable route, with all transmitted data, the stored key, the stored encryption information, and the unencrypted information transmitted from the transponder to the reading device; a random number generator that is configured to generate random numbers; and an encryptor that is configured to compute randomized encrypted information utilizing the generated random numbers, wherein with every encryption of a message M using key K, a random string R is generated, and the encryption is a function F using K and R to encrypt M. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An encryption method in a radio frequency identification (RFID) transponder comprising at least one memory, a transmitter, a random number generator, and an encryptor, the encryption method comprising:
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storing, with the at least one memory, both encrypted information that has been encrypted by use of a key and the key necessary to decrypt the stored encrypted information; transmitting, with the transmitter, in response to queries of a reading device, the stored key by a slowly readable route and the stored encrypted information by a first fast readable route, wherein the slowly readable route and the first fast readable route are different routes, with data transmitted over the slowly readable route having a lower transmission speed than data transmitted over the first fast readable route; transmitting, with the transmitter, unencrypted information via a second fast readable route, separate from the first fast readable route for the stored encrypted information, with data transmitted over the slowly readable route having a lower transmission speed than data transmitted over the second fast readable route, with all transmitted data, the stored key, the stored encryption information, and the unencrypted information transmitted from the transponder to the reading device; generating, with the random number generator, random numbers; and computing, with the encryptor, randomized encrypted information utilizing the generated random numbers, wherein with every encryption of a message M using key K, a random string R is generated, and the encryption is a function F using K and R to encrypt M.
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13. A non-transitory medium, which, when instructions embodied upon the non-transitory medium are executed by a processor causes the processor to perform encryption, the non-transitory medium comprising:
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instructions for storing, with a memory, both encrypted information that has been encrypted by use of a key and the key necessary to decrypt the stored encrypted information; instructions for transmitting, with a transmitter, in response to queries of a reading device, the stored key by a slowly readable route and the stored encrypted information by a first fast readable route, wherein the slowly readable route and the first fast readable route are different routes, with data transmitted over the slowly readable route having a lower transmission speed than data transmitted over the first fast readable route; instructions for transmitting, with the transmitter, unencrypted information via a second fast readable route, separate from the first fast readable route for the stored encrypted information, with data transmitted over the slowly readable route having a lower transmission speed than data transmitted over the second fast readable route, with all transmitted data, the stored key, the stored encryption information, and the unencrypted information transmitted from the transponder to the reading device; instructions for generating, with a random number generator, random numbers; and instructions for computing, with an encryptor, randomized encrypted information utilizing the generated random numbers, wherein with every encryption of a message M using key K, a random string R is generated, and the encryption is a function F using K and R to encrypt M.
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Specification