CN201707691U - Radio frequency identification card allowing users to change encryption algorithms by users - Google Patents

Abstract

The utility model discloses a radio frequency identification card allowing users to change encryption algorithms by the users, which comprises an active radio frequency identification card body with a key, a chip set, a single chip microcomputer and a memory set. A radio frequency transceiving circuit is integrated into the chip set which is embedded into the card body and used for realizing change of encryption algorithms, the radio frequency transceiving circuit is used for receiving radio frequency signals transmitted by a radio frequency card reader-writer and modulating the received radio frequency signals into digital signals recognizable to a system, the single chip microcomputer used for controlling the integral radio frequency card includes receiving and transmission of control information, and extraction and running of various programs, the memory set at least includes a read only memory and an erasable memory, initial program is solidified in the read only memory to finish identification of types of received information, and the erasable memory is controlled by the single chip microcomputer to finish emptying or storing and processing update data containing new encryption algorithms. The radio frequency identification card allows users to modify the algorithms by the users according to needs so as to increase application safety.

Description

The radio-frequency identification card of replacing encryption algorithm by user

Technical field

The utility model relates to communication technique field, relates in particular to a kind of active radio-frequency identification card (RFID) of replacing encryption algorithm by user.

Background technology

RFID (active radio-frequency (RF) identification) technology is an automatic identification technology that moves to maturity from the eighties in last century, and development in recent years is very rapid.RFID is widely used at home at present, mainly concentrates on fields such as identification, public transport management, logistics management.

Radio-frequency identification card (RFID) is commonly called wireless identification tag.Compare with the same period such as bar code, magnetic card, IC-card or early stage recognition technology, radio-frequency card have noncontact, operating distance long, be suitable for rugged surroundings, can discern advantage such as moving target.

In the application scenario very high to security requirement, regularly or irregularly change key even change cryptographic algorithm, for improving security of system very important meaning is arranged.

Radio-frequency identification card (RFID) key, the cryptographic algorithm when dispatching from the factory that adopts just finalized the design now, and some cards can be revised key, but algorithm is not revised.In case system is attacked breakthrough or system upgrades, and often needs more scaling method.And the production again that the change that will do algorithm just must block causes financial resources, waste of time.

Summary of the invention

The purpose of this utility model provides a kind of radio-frequency identification card of replacing encryption algorithm by user, and it can be revised algorithm by the client as required voluntarily, to improve the security of its application.

For achieving the above object, the utility model is taked following design proposal:

A kind of radio-frequency identification card of replacing encryption algorithm by user comprises the active radio-frequency identification card body that has antenna and key; Also be embedded with the chipset that is used to realize changing cryptographic algorithm at Ka Nei, be integrated with in this chipset:

One RF transmit-receive circuit is used for the radiofrequency signal that the received RF card reader sends, and the radiofrequency signal that receives is demodulated into the discernible digital signal of system;

One single-chip microcomputer is used for the control of whole radio-frequency identification card, comprises the reception of control information and the extraction and the operation of transmission and various programs;

Storage stack, this group storer include a read-only type storer and an erasable type storer at least; Be solidified with initial program in the read-only type storer, finish identification the information type that receives; Erasable type storer is finished by Single-chip Controlling to empty or the more new data that comprises new cryptographic algorithm is stored and handled;

The RF transmit-receive circuit radio-frequency head links to each other with antenna, and its digital signal input/output terminal links to each other with the single-chip microcomputer input/output terminal, and the data bus of single-chip microcomputer, address bus and control signal wire are connected with storer the corresponding interface.

Described erasable type storer is the one or more combination in FLASH and the eeprom memory.

Described new cryptographic algorithm is that the user is from design or the online new cryptographic algorithm of downloading.

The radio-frequency identification card of the utility model replacing encryption algorithm by user is a kind of radio-frequency identification card of the algorithm of hack as required.Modification key, modification algorithm user can finish voluntarily, and be very easy, quick.User even fully can oneself design cryptographic algorithm downloads in the card, and can hack.In fact this being stuck in when dispatching from the factory can be a blank card, how to use and can be gone design, be realized by user oneself.Satisfied the needs that the user oneself encrypts, safety in utilization is higher.

The utility model has the advantages that: the user can select cipher mode voluntarily, even oneself designs cryptographic algorithm, and safety in utilization improves greatly.Avoided because will change cryptographic algorithm, and radio-frequency card and system have been changed inconvenience and the waste that is caused, thereby reduced cost or bring convenience in the use.This card structure is simple, uses very big dirigibility, can reasonably select according to needed frequency range, cost, integrated level, processing speed.Production cost can be controlled at very low level, and performance also can well be guaranteed.

Description of drawings

Fig. 1 is the schematic block circuit diagram of the radio-frequency identification card of the utility model replacing encryption algorithm by user.

Fig. 2 is the process flow diagram of the radio-frequency identification card implementation method of the utility model replacing encryption algorithm by user.

Below in conjunction with drawings and the specific embodiments the utility model is further described

Embodiment

The radio-frequency identification card of the utility model replacing encryption algorithm by user should be one to have the active radio-frequency identification card of antenna and key, the prior art of foundation as management control system, rf read-write device etc. can adopt of this radio-frequency identification card system at least.

Consult shown in Figure 1ly, main creation point of the present utility model is to be embedded in the chipset that is used to realize changing cryptographic algorithm at card, and this chipset is integrated with RF transmit-receive circuit module 1, single-chip microcomputer 2, storer 3; The radio-frequency head of RF transmit-receive circuit module 1 links to each other with antenna 4, and the digital input and output side of RF transmit-receive circuit links to each other with the single-chip microcomputer input/output terminal, and the data bus of single-chip microcomputer, address bus and control signal wire are connected with storer the corresponding interface.Finish transmitting-receiving, system identification, data processing and the program of signal, the storage work of data respectively.

Described RF transmit-receive circuit, the radiofrequency signal that the received RF card reader sends also is demodulated into the manageable digital signal of system with it.

Described single-chip microcomputer can be various single-chip microcomputer, comprises the microprocessors such as MSP430 single-chip microcomputer of ATMEL single-chip microcomputer, Philips single-chip microcomputer, MicroChip single-chip microcomputer, Motorola single-chip microcomputer and TI company, is used to realize the control to native system.

Storage stack, this group storer include a read-only type storer (ROM) and an erasable type storer (normally FLASH or EEPROM) at least; Be solidified with initial program in the described read-only type storer, this part program is finished two big functions, and the one, the action type of determining system with system communication the time is general identifying operation or will carries out program (algorithm) and upgrade.The 2nd, finish concrete operations.If identifying operation just forwards the recognizer part to; If system update just receives new algorithm routine, and writes in the scratch pad memory.Described erasable type storer is finished by Single-chip Controlling to empty or update algorithm program, key and system information are stored.

For making the radio-frequency identification card storage more information of changing cryptographic algorithm, described read-only type storer (ROM) and erasable type storer all can be a plurality of common uses, and erasable type storer all can be the one or more combinations in FLASH and the eeprom memory.

Described system information can be the needed initial program of the operate as normal of system own, also can be the internal information that radio-frequency card system own is contained.

Principle and process that the radio-frequency identification card specific implementation cryptographic algorithm of the utility model replacing encryption algorithm by user is changed are: when dispatching from the factory, initial program (this subprogram is curable in the ROM (read-only memory) of single-chip microcomputer, and is also curable in the independent storage chip that links to each other with single-chip microcomputer) is solidified in the radio-frequency identification card system.After the radio-frequency identification card system receives the information that rf read-write device sends, this subprogram can be discerned the information type that receives, when being identified as the card program of writing (be user can self-designed cryptographic algorithm), single-chip microcomputer empties specific memory (as flash), and the program that receives is written among the flash.When being identified as data, single-chip microcomputer just can be stored and handle data according to user's setting.Return initial duty, behind user's selected encryption algorithm, the program that establishment is corresponding with it utilizes rf read-write device that program is write in the radio-frequency identification card of this replacing encryption algorithm by user.

In the said method, if the card in user's hand is a blank card, then the user is stored in the erasable type storer set by step voluntarily by designing voluntarily or downloading new cryptographic algorithm on the net.If had the card of cryptographic algorithm, the user still can upgrade cryptographic algorithm voluntarily by the way that designs or download new cryptographic algorithm voluntarily on the net.

Chance system upgrade or modification algorithm only need the new program of establishment, write again to get final product.

The various embodiments described above can not break away under the scope of the present utility model in addition some variations, thus above explanation comprises and accompanying drawing shown in structure should be considered as exemplary, but not in order to limit claim of the present utility model.

Claims (2)

1. the radio-frequency identification card of a replacing encryption algorithm by user comprises the active radio-frequency identification card body that has antenna and key; It is characterized in that: also be embedded with the chipset that is used to realize changing cryptographic algorithm at Ka Nei, be integrated with in this chipset

One RF transmit-receive circuit is used for receiving the radiofrequency signal in space, and the radiofrequency signal that receives is demodulated into the discernible digital signal of system;

One single-chip microcomputer is used for the control of whole radio-frequency identification card, comprises the reception of control information and the extraction and the operation of transmission and various programs;

Storage stack, this group storer include a read-only type storer and an erasable type storer at least; Be solidified with initial program in the read-only type storer, finish identification the information type that receives; Erasable type storer is finished by Single-chip Controlling to empty or the more new data that comprises new cryptographic algorithm is stored and handled;

The RF transmit-receive circuit radio-frequency head links to each other with antenna, and its digital signal input/output terminal links to each other with the single-chip microcomputer input/output terminal, and the data bus of single-chip microcomputer, address bus and control signal wire are connected with storer the corresponding interface.

2. the radio-frequency identification card of replacing encryption algorithm by user according to claim 1, it is characterized in that: described erasable type storer is the one or more combination in FLASH and the eeprom memory.

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