CN202467379U - Dynamic password remote control lock based on chaotic technology - Google Patents

Abstract

The utility model relates to a dynamic password remote control lock based on chaotic technology. Certain risks exist in the prior remote control lock password. The dynamic password remote control lock based on the chaotic technology comprises a wireless launcher, a wireless receiver and an electronic lock. The wireless launcher sends a chaotic rolling code, the wireless receiver receives the chaotic rolling code and proceeds to compare an algorithm, and the electronic lock is unlocked under the control of the wireless receiver if the algorithm is right. The chaotic technology is combined with the rolling code technology in the dynamic password remote control lock, a fixed code is further set in the system, an identical chaotic function is respectively embedded into a launching module and a receiving module, a pseudorandom sequence produced by the chaotic function and the fixed code serve as a secret key, the function in the launching module and the receiving module iterates once every time the remote control is carried out, and a novel code is produced by means of an iterated value. Accordingly, the code which is used each time is different and the code used last time is immediately invalid. Because the receiver proceeds to compare the algorithm after the secret key is received and the lock can be unlocked only when the algorithm is right, the system safety is higher.

Description

A kind of dynamic password remote control lock based on chaos technology

Technical field

The utility model belongs to wireless communication technology field, relates to a kind of dynamic password remote control lock based on chaos technology.

Background technology

The raising of Along with people's life and the reinforcement of awareness of safety, the remote control password lock product that various vehicles or door and window are used is constantly released.The password of initial remote control lock is fixed, and improves its confidentiality through the length that increases password.But because the fixing defective of password, so stolen password by special receiver easily, the theft of unblanking then.For addressing this problem, the researcher has invented hopping code, promptly in remote control system except regular coding; Also increase coincidence counter; Numeration synchronously adds 1 during each straighforward operation, encrypts formation encrypt data in back with regular coding through AES, and sends with data such as key assignments.Because the each all differences of sending of synchronometer numerical value are no exception even same button is repeatedly pressed.Counting rolls forward automatically synchronously, and the code word of transmission can not take place again.Receiving terminal receives after the ciphertext, deciphers through the decipherment algorithm of producer, judges that consistent back notice executing agency carries out user command, and numerical value change is regular because hopping code is fallen into a trap, and encrypts with regular coding, also has the risk that necessarily is cracked.

Summary of the invention

The utility model provides a kind of dynamic password remote control lock based on chaos technology to the deficiency of prior art.

The technical scheme that the utility model technical solution problem is taked:

A kind of dynamic password remote control lock based on chaos technology comprises wireless launcher, wireless receiver, electronic lock, wireless launcher emission chaos rolling code; Receive by wireless receiver; If the line algorithm of going forward side by side comparison correct, is then opened by wireless receiver control electronic lock;

Described wireless launcher is made up of the one 51 minimum system, a nrf905 wireless transmitter module, a 24C02 chip, the button of unblanking; The one nrf905 wireless transmitter module, a 24C02 chip, the button of unblanking all are connected with the one 51 minimum system signal.

Described wireless receiver is made up of the 2 51 minimum system, the 2nd nrf905 wireless receiving module, the 2nd 24C02 chip, electronic lock controlled control module; The 2nd nrf905 wireless receiving module, the 2nd 24C02 chip, electronic lock controlled control module all are connected with the 2 51 minimum system signal.

The beneficial effect of the utility model:

The utility model combines chaos technology with hopping code, this system also is provided with regular coding (sequence number), in transmitting and receiving module, implants identical chaotic function simultaneously; Utilize pseudo-random sequence that chaotic function produces and regular coding as key, every remote control once transmit and receive in the module function iteration once, with the generation of the value after iteration new password; The password of so each use is all different; And preceding nonrecoverable password lost efficacy immediately, accomplished " one-time pad ", and receiver is receiving the laggard line algorithm comparison of key; Have only algorithm could normally unblank, make security of system higher than correct.

Description of drawings

Fig. 1 the utility model structural representation;

Fig. 2 wireless launcher sketch map;

Fig. 3 wireless receiver sketch map;

Fig. 4 NRF905 wireless transmit and receiver module circuit theory diagrams;

Fig. 5 24C02 memory module schematic diagram.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further described.

As shown in Figure 1, chaos rolling code wireless remote control locking device, whole system is divided into three ingredients, wireless launcher, wireless receiver, electronic lock.

As shown in Figure 2, wireless launcher is made up of the one 51 minimum system, a nrf905 wireless transmitter module, a 24C02 chip, the button of unblanking; After wireless launcher powers on; Carry out initial work; Chaos system in 51 single-chip microcomputers in the one 51 minimum system can produce a chaotic key

; This chaotic key

is gone into a 24C02 chip by programming; Button is pressed when unblanking; Wireless launcher can read a chaotic key from the 24C02 chip, and is transmitted to the wireless interface receiver via a NRF905 wireless transmitter module;

Each chaos sequence key

is the data of 32bit, and is brought into the chaos equation as the previous iteration value

In produce next chaotic key

.By that analogy; Press the beginning button at every turn; No matter whether receiver receives; The chaotic key that the chaos system of transmitter all can read through a 24C02 chip; Produce new chaotic key

; And the chaotic key that reads

launched through the NRF905 chip; In the burned 24C02 chip of new chaos sequence key

; Substitute original

; So repeatedly; Each chaotic key only is used once, no longer reuses.

As shown in Figure 3, described wireless receiver is made up of the 2 51 minimum system, the 2nd nrf905 wireless receiving module, the 2nd 24C02 chip, electronic lock controlled control module;

After wireless receiver powers on; Carry out initial work, the chaos system in 51 single-chip microcomputers in the 2 51 minimum system can produce 16 chaotic keys

; These 16 chaotic keys and its iterations n can be burned in the 2nd 24C02 chip.When the 2nd nrf905 wireless receiving module receives key

; Can compare successively with 16 chaotic keys

in the 2nd 24C02 chip, have following two kinds of situation:

(1) if

any with

one identical; The success of chaotic key sequence alignment then is described; Wireless receiver can be controlled electronic lock control interface, opens electronic lock.At this moment; Under the comparison case of successful; Wireless receiver is an iterative initial value with

, substitution chaos equation:

Upgrade these 16 chaotic keys for

, for receiving key match next time.

(2), explain that then the chaotic key sequence alignment is unsuccessful if

is all inequality with .

Consider actual user situation; Possible situation is that the button of unblanking of wireless launcher is repeatedly pressed under the situation that the wireless interface receiver does not receive; The chaotic key sequence of wireless launcher is repeatedly upgraded; The numerical value that causes

has surpassed the scope of 16 chaotic keys

of wireless interface receiver storage, so that can not normally match.

Wireless receiver can be the interative computation 2000 times that initial value carries out the chaos equation with

, and the chaos equation is:

Getting each iterative value

compares with

; If in 2000 interative computations; arranged; Think then and compare successfully that wireless receiver carries out the key updating in above-mentioned (1) and unblanks.If in 2000 interative computations; There is not

; Think that then comparison is unsuccessful, do not carry out key updating.

Fig. 4 is the same for transmitting and receiving wireless module physical circuit figure, transmitting and receiving hardware circuit, through software it is set and is sending mode or receiving mode.

Adopt nRF905 monolithic radio frequency emitter chip, its operating voltage is 1.9-3.6V, and 32 pin QFN encapsulate (5mm * 5mm), work in 433/868/915MHz3 ISM channel (can freely use).

NRF905 can accomplish the work of handling prefix and CRC (CRC) automatically; Can accomplish Manchester's code/decoding automatically by hardware in the sheet; Use SPI interface and micro-controller communications, dispose very conveniently, its power consumption is very low; Electric current has only 11mA during with the power output emission of-10dBm, and electric current is 12.5mA when receiving mode.The work of nRF905 monolithic wireless transceiver is by a fully-integrated frequency modulator, the receiver of a band demodulator, and a power amplifier, a crystal oscillator and an adjuster are formed.The characteristics of ShockBurst mode of operation are to produce lead code and CRC automatically, can be easy to carry out programmed configurations through the SPI interface.

Be characterized in; Matching addresses position with 32 four bytes, promptly two nRF905 have only the matching addresses position of these four bytes identical in communication process; Could normal swap data, this in software design of this remote control system as the first floor authentication information of Remote control electronic lock.

Fig. 5 is for transmitting and receiving the device memory circuit

Adopt the 24c02 chip, it is the memory device of Serial E 2PROM based on I2C-BUS, follows the two-wire system agreement, because that it has an interface is convenient, volume is little, and the data power down such as does not lose at characteristics, in instrument and meter and industrial automation control, obtains number of applications.Its inner organizational styucture that adopts 256*8bit, capacity is 2k bit, adopts the two-wire serial interface; And the Low Voltage Technique of using; The minimum voltage that can move is 1.8v, and its erasing and writing life is 1,000,000 times, and the data holding time is 100 years; And data hardware writing protection function is arranged, can well be applied in the removable handheld device.

Claims (1)

1. the dynamic password remote control based on chaos technology is locked; Comprise wireless launcher, wireless receiver, electronic lock; It is characterized in that: wireless launcher emission chaos rolling code is received the line algorithm of going forward side by side comparison by wireless receiver; If correct, then open by wireless receiver control electronic lock;

Described wireless launcher is made up of the one 51 minimum system, a nrf905 wireless transmitter module, a 24C02 chip, the button of unblanking; The one nrf905 wireless transmitter module, a 24C02 chip, the button of unblanking all are connected with the one 51 minimum system signal;

Described wireless receiver is made up of the 2 51 minimum system, the 2nd nrf905 wireless receiving module, the 2nd 24C02 chip, electronic lock controlled control module; The 2nd nrf905 wireless receiving module, the 2nd 24C02 chip, electronic lock controlled control module all are connected with the 2 51 minimum system signal.

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