COMMUNICATION DEVICE, COMMUNICATION METHOD, AND COMMUNICATION SYSTEM

• US 20110305335A1
• Filed: 06/02/2011
• Published: 12/15/2011
• Est. Priority Date: 06/10/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Negishi, Masaki, Akaida, Tetsuro
• Granted Patent: US 8,804,959 B2
• Time in Patent Office: Days
• US Class Current: 380/255
• CPC Class Codes: H04L 2209/805 Lightweight hardware, e.g. radio-frequency identification [RFID] or sensor
• CPC Class Codes: H04L 9/0838 Key agreement, i.e. key establishment technique in which a shared key is derived by parties as a function of information contributed by, or associated with, each of these network architectures or network communication protocols for key exchange in a packet data network H04L63/061
• CPC Class Codes: H04L 9/3242 involving keyed hash functions, e.g. message authentication codes [MACs], CBC-MAC or HMAC

Abstract

Provided is a communication device including: a communication section performing proximity communication with a reader/writer; a storage section storing data and a sequence number; and a control section controlling the writing of the data to the storage section in accordance with a command from the reader/writer. The communication section sends the sequence number to the reader/writer and receives first encryption data, which is generated by the reader/writer using a value based on the sequence number and writing target data which is target data which is written into the storage section, and the writing target data from the reader/writer, and the control section generates second encryption data using the value based on the sequence number and the writing target data, writes the writing target data into the storage section, and updates the sequence number in a case where the first encryption data and the second encryption data match.

Claims

1. A communication device comprising:

a communication means which performs proximity communication with a reader/writer;

a storage means which stores data and a sequence number where a value is updated regularly each time data is written into the storage means; and

a control means which controls the writing of the data to the storage means in accordance with a command from the reader/writer,

wherein the communication means sends the sequence number stored in the storage means to the reader/writer and receives first encryption data, which is generated by the reader/writer using a value based on the sequence number and writing target data which is target data which is written into the storage means, and the writing target data from the reader/writer, and

the control means generates second encryption data using the value based on the sequence number and the writing target data which is received by the communication means, writes the writing target data which is received by the communication means into the storage means, and updates the sequence number stored in the storage means in a case where the first encryption data and the second encryption data match.

2. The communication device according to claim 1,

wherein the value based on the sequence number is the sequence number itself or the sequence number after updating.

3. The communication device according to claim 1,

wherein the reader/writer generates a random number and sends the random number to the communication device,

the communication means receives the random number sent from the reader/writer,

the control means generates a session key used in the session with the reader/writer using an individual key which is unique to the communication device which is generated using distinguishing information which distinguishes the communication device and the random number received by the communication means, and generates third encryption data using the distinguishing information and the session key,

the communication means sends the distinguishing information and the third encryption information to the reader/writer, and

the reader/writer generates the individual key using the distinguishing information sent from the communication means, generates the session key using the individual key and the random number, generates fourth encryption data using the distinguishing information sent from the communication means and the session key, performs one-side authentication which authenticates the communication device by comparing the third encryption data and the fourth encryption data, and sends the first encryption data and the writing target data to the communication device in a case where the one-side authentication is successful.

4. The communication device according to claim 1,

wherein only one sequence number is provided in the storage means.

5. The communication device according to claim 1,

wherein a portion of a storage region of the storage means is a user block which is a storage region of the smallest unit which is possible to be allocated to a service,

the user block has a plurality of units,

the units have one or more pages which are pages which are storage regions of predetermined units where writing is performed,

one unit out of the plurality of units which configure the user block is a buffer unit which functions as a buffer which buffers the data written into the user block,

the storage means stores management information for managing the storage region of the storage means,

the management information includes a unit number which specifies the unit, and

the control means performs writing of data to a target unit by writing the unit number of the target unit, which is a unit which is a target for data to be written into, as the unit number of the buffer unit and sets the target unit as a new buffer unit.

6. The communication device according to claim 5,

wherein the unit is configured to have one page,

another portion of the storage region of the storage means is a management block which stores the management information of each of the user blocks,

the management information of the user block includes the unit numbers of each of the plurality of units of the user block and one sequence number, and

the control means updates the one sequence number which is included in the management information of the user block which has the unit where the writing target data is written into.

7. The communication device according to claim 5,

wherein the unit is configured by a plurality of pages,

one page out of the plurality of pages of one unit is a management page which stores the management information of each of the units,

the management information of the unit includes the unit number of the unit and one sequence number, and

the control means updates the one sequence number included in the management information of the unit where the writing target data is written in.

8. The communication device according to claim 5,

wherein the first encryption data and the second encryption data are generated using the value based on the sequence number, the writing target data, and the unit number of the target unit.

9. A communication method of a communication device, which is provided with a communication means which performs proximity communication with a reader/writer, a storage means which stores data and a sequence number where a value is updated regularly each time data is written into the storage means, and a control means which controls the writing of the data into the storage means in accordance with a command from the reader/writer, the method comprising the steps of:

sending the sequence number stored in the storage means to the reader/writer and receiving first encryption data, which is generated by the reader/writer using a value based on the sequence number and writing target data which is target data which is written into the storage means, and the writing target data from the reader/writer using the communication means; and

generating second encryption data using the value based on the sequence number and the writing target data which is received by the communication means, and writing the writing target data which is received by the communication means into the storage means and updating the sequence number stored in the storage means in a case where the first encryption data and the second encryption data match using the control means.

10. A communication device comprising:

a communication means which performs proximity communication with a wireless tag which has a storage means which stores data and a sequence number where a value is updated regularly each time data is written into the storage means; and

a generating means which generates first encryption data using a value based on the sequence number sent from the wireless tag and writing target data which is target data which is written into the storage means,

wherein the communication means sends the first encryption data and the writing target data to the wireless tag.

11. The communication device according to claim 10,

wherein the value based on the sequence number is the sequence number itself or the sequence number after updating.

12. The communication device according to claim 10, further comprising:

a random number generating means which generates a random number which the communication device uses to authenticate the wireless tag,

wherein the wireless tag generates the second encryption data using the value based on the sequence number and the writing target data from the communication means, and writes the writing target data into the storage means and updates the sequence number stored in the storage means in a case where the first encryption data and the second encryption data match,

the communication means sends the random number to the wireless tag,

the wireless tag receives the random number sent from the communication means, generates a session key used in the session with the communication device using an individual key which is unique to the wireless tag which is generated using distinguishing information which distinguishes the wireless tag and the random number, generates third encryption data using the distinguishing information and the session key, and sends the distinguishing information and the third encryption data to the communication device,

the generating means generates the individual key using the distinguishing information sent from the wireless tag, generates the session key using the individual key and the random number, generates fourth encryption data using the distinguishing information sent from the wireless tag and the session key, and performs one-side authentication which authenticates the wireless tag by comparing the third encryption data and the fourth encryption data, and

the communication means sends the first encryption data and the writing target data to the wireless tag in a case where the one-side authentication is successful.

13. A communication method of a communication device, which is provided with a communication means which performs proximity communication with a wireless tag which has a storage means which stores data and a sequence number where a value is updated regularly each time data is written into the storage means, and a generating means which generates first encryption data using the value based on the sequence number sent from the wireless tag and writing target data which is target data which is written into the storage means, the method comprising the steps of:

generating the first encryption data using the generating means; and

sending the first encryption data and the writing target data to the wireless tag using the communication means.

14. A communication system comprising:

a reader/writer and a wireless tag which perform proximity communication,

wherein the reader/writer has a first communication means which performs proximity communication with the wireless tag which has a storage means which stores data and a sequence number where a value is updated regularly each time data is written into the storage means, and a generating means which generates first encryption data using a value based on the sequence number sent from the wireless tag and writing target data which is target data which is written into the storage means,

the first communication means sends the first encryption data and the writing target data to the wireless tag,

the wireless tag has a second communication means which performs proximity communication with the reader/writer, the storage means, and a control means which controls the writing of the data to the storage means in accordance with a command from the reader/writer,

the second communication means sends the sequence number stored in the storage means to the reader/writer and receives first encryption data and the writing target data sent from the reader/writer, and

the control means generates second encryption data using the value based on the sequence number and the writing target data which is received by the second communication means, and writes the writing target data which is received by the second communication means into the storage means and updates the sequence number stored in the storage means in a case where the first encryption data and the second encryption data match.

15. A communication method of a communication system, which is provided with a reader/writer and a wireless tag which perform proximity communication, wherein the reader/writer has a first communication means which performs proximity communication with the wireless tag which has a storage means which stores data and a sequence number where a value is updated regularly each time data is written into the storage means, and a generating means which generates first encryption data using a value based on the sequence number sent from the wireless tag and writing target data which is target data which is written into the storage means, and the wireless tag has a second communication means which performs proximity communication with the reader/writer, the storage means, and a control means which controls the writing of the data to the storage means in accordance with a command from the reader/writer, the method comprising the steps of:

sending the first encryption data and the writing target data to the wireless tag using the first communication means;

sending the sequence number stored in the storage means to the reader/writer and receiving the first encryption data and the writing target data sent from the reader/writer using the second communication means;

generating second encryption data using the value based on the sequence number and the writing target data which is received by the second communication means; and

writing the writing target data which is received by the second communication means into the storage means and updating the sequence number stored in the storage means in a case where the first encryption data and the second encryption data match using the control means.

16. A communication device comprising:

a communication section which performs proximity communication with a reader/writer;

a storage section which stores data and a sequence number where a value is updated regularly each time data is written into the storage section; and

a control section which controls the writing of the data to the storage section in accordance with a command from the reader/writer,

wherein the communication section sends the sequence number stored in the storage section to the reader/writer and receives first encryption data, which is generated by the reader/writer using a value based on the sequence number and writing target data which is target data which is written into the storage section, and the writing target data from the reader/writer, and

the control section generates second encryption data using the value based on the sequence number and the writing target data which is received by the communication section, writes the writing target data which is received by the communication section into the storage section, and updates the sequence number stored in the storage section in a case where the first encryption data and the second encryption data match.

17. A communication device comprising:

a communication section which performs proximity communication with a wireless tag which has a storage section which stores data and a sequence number where a value is updated regularly each time data is written into the storage section; and

a generating section which generates first encryption data using a value based on the sequence number sent from the wireless tag and writing target data which is target data which is written into the storage section,

wherein the communication section sends the first encryption data and the writing target data to the wireless tag.