CN105281909A - Encryption and decryption mechanism and internet of things lock system using encryption and decryption mechanism - Google Patents
Encryption and decryption mechanism and internet of things lock system using encryption and decryption mechanism Download PDFInfo
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- CN105281909A CN105281909A CN201510367136.0A CN201510367136A CN105281909A CN 105281909 A CN105281909 A CN 105281909A CN 201510367136 A CN201510367136 A CN 201510367136A CN 105281909 A CN105281909 A CN 105281909A
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Abstract
The invention provides an encryption and decryption mechanism and an internet of things lock system using the encryption and decryption mechanism. The encryption and decryption mechanism is a hybrid encryption and decryption mechanism. The internet of things lock system comprises an intelligent lock and a controller. Communication is performed between the intelligent lock and the controller. The controller is communicated with other internet of things equipment or internet terminals. The intelligent lock and the controller are respectively and internally provided with a safety module. The safety module is provided with an encryption and decryption function. Encryption and decryption operation of the safety modules is carried out on the information transmission between the intelligent lock and the controller. According to the invention, the internet of things lock system can be connected with other internet of things equipment or internets, a user is enabled to safely receive lock state information and remotely control the intelligent lock on equipment such as a PC, a notebook computer and a mobile phone, the safety performance is good, and the internet of things lock system can be widely applied to important places relatively high in safety requirement.
Description
Technical field
The present invention relates to communication and internet of things equipment field, especially a kind of encryption and decryption is machine-processed and adopt the Internet of Things of this encryption and decryption mechanism to lock system.
Background technology
Along with the fast development of technology of Internet of things, increasing Internet of Things smart machine enters the life of people.Internet of Things smart machine generally has the ability of carrying out with other internet of things equipment or the Internet communicating, thus achieve Long-distance Control or the operation of relevant device, for the work of people and life provide a lot of facilities, improve convenient degree and the operating efficiency of life.
Lock is as equipment indispensable in one way of life, and the Intelligent internet of things lockset of its correspondence has broad application prospects and commercial value.But the use that the particularity of lock determines Intelligent internet of things lock must ensure its fail safe, comprises the safety of its physical security and information transmission.Therefore, how to ensure the fail safe of Internet of Things lock information transmission, become an important problem.
In existing information transmission mechanisms, the general mode of symmetric key encryption or asymmetric-key encryption that adopts encrypts the information transmitted between transmit leg to reciever, thus realizes the fail safe of information transmission.As shown in Figure 2, the method of symmetric key encryption is generally: transmit leg and recipient consult calculating session key K encryption and decryption information (routine Oakley key determination agreement in a secure manner, this agreement provides number of mechanisms to resist various attacks, more safe and reliable secret connection is set up by authentication), its encryption and decryption flow process is
Encryption: Y=E
k(X); Deciphering: D
k(Y)=D
k(E
k(X))=X
Adopt this kind of encryption and decryption mode, its advantage is that encryption and decryption amount of calculation is little, and speed is fast, and information transmission instantaneity is good; But it is not high that it also exists fail safe, symmetric key can be obtained by third party and crack the defect of ciphertext.
As shown in Figure 3, the method of asymmetric-key encryption is adopted to be generally: transmit leg and recipient generate respectively or import a pair unsymmetrical key, private key oneself is preserved, and PKI is open to the other side in digital certificate mode, and digital certificate is provided by the third party CA center of authority.When sending direction recipient sends information, transmit with after the public key encryption information of recipient, after recipient receives message, with its private key decryption information, its encryption and decryption flow process is
Encryption:
deciphering:
Adopt this kind of encryption and decryption mode, because the private key of recipient only has recipient to have, therefore only have reception can decryption information, thus there is good fail safe.But the amount of calculation of this kind of encryption and decryption mode is large, and processing speed is slow, transmitting, comparatively multi information time delay is comparatively large late, and actual Use Limitation fruit is unsatisfactory.
In addition, adopt above-mentioned encryption and decryption mode, information is still likely forged by intercepting and capturing or is carried out Replay Attack in transmitting procedure, can not guarantee the fail safe of information transmission.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of encryption and decryption mechanism, adopts the mode of Hybrid Encryption, has fail safe and response speed efficiently concurrently, and can prevent information from being intercepted and captured forgery or being carried out repeat attack.
In order to realize above-mentioned technical purpose, present invention employs following technical scheme:
An encryption and decryption mechanism, transmit leg and recipient generate respectively or import a pair unsymmetrical key, and wherein private key oneself is preserved, and PKI is open to the other side in digital certificate mode after third party CA center certification;
When sending direction recipient sends information X, specifically comprise the following steps:
A. transmit leg stochastic generation symmetric key K, obtains ciphertext Y with described symmetric key K enciphered message X;
B. the transmit leg PKI PK of recipient
bencrypt described symmetric key K, obtain ciphertext symmetric key Z;
C. described ciphertext Y and ciphertext symmetric key Z is sent to recipient by transmit leg;
D. after recipient receives described ciphertext Y and ciphertext symmetric key Z, with described PKI PK
bcorresponding private key SK
bdecrypt symmetric key K;
E. recipient is with the symmetric key K decrypting ciphertext Y decrypted, and obtains information X.
As further improvement,
In described step c, transmit leg is by the private key SK of described ciphertext Y and ciphertext symmetric key Z with oneself
arecipient is sent to SIG (Y+Z) form after signature;
In described steps d, after recipient receives described SIG (Y+Z), with transmit leg with described private key SK
acorresponding PKI PK
athe legitimacy of checking SIG (Y+Z);
If the content legality of SIG (Y+Z), carries out next step; If illegal, then report an error.
Further improve as encryption and decryption mechanism of the present invention,
When sending direction recipient sends information X, specifically comprise the following steps:
A. transmit leg stochastic generation symmetric key K and random number x, and obtain ciphertext Y with described symmetric key K enciphered message X;
B. the transmit leg PKI PK of recipient
bencrypt described symmetric key K and random number x, obtain ciphertext symmetric key Z, wherein, Z=PK
b(K+x);
C. transmit leg is by the private key SK of described ciphertext Y and ciphertext symmetric key Z with oneself
arecipient is sent to SIG (Y+Z) form after signature;
D. after recipient receives described SIG (Y+Z), with transmit leg with described private key SK
acorresponding PKI PK
athe legitimacy of checking SIG (Y+Z);
If the content legality of SIG (Y+Z), carries out next step; If illegal, then report an error;
E. after recipient obtains ciphertext Y and ciphertext symmetric key Z, with described PKI PK
bcorresponding private key SK
bdecrypt symmetric key K and random number x, and verify whether described random number x repeats with the last time;
If do not repeat, carry out next step; If repeat, then report an error;
F. recipient is with the symmetric key K decrypting ciphertext Y decrypted, and obtains information X.
Encryption and decryption mechanism of the present invention, combine the mode of symmetric key encryption and asymmetric-key encryption, use symmetric key encryption information itself, adopt symmetric key described in asymmetric-key encryption, thus both overcome the not high defect of symmetric key encryption fail safe, overcome again the problem that asymmetric-key encryption amount of calculation is large, processing speed is slow, ensure that the fail safe of information transmission and ageing simultaneously.
Further, transmit leg send ciphertext Y and encryption key Z time transmit leg private key signature after send again, the PKI of recipient's transmit leg verifies the legitimacy of above-mentioned signature, thus ensures that above-mentioned information can not be forged by hacker.
Further, if after hacker intercepts and captures last SIG (Y+Z) packet sent of record, again send this SIG (Y+Z) packet to recipient; At this moment recipient receives SIG (Y+Z), can be verified and pass through, but the SIG in fact accepted (Y+Z) is the content of command last time, recipient can think that transmit leg sends again new instruction or data and performed by mistake, thus makes hacker utilize this leak to manufacture Replay Attack.And invention introduces nonce mechanism, when transmit leg sends ciphertext Y and encryption key Z, also introduce random number x at every turn, ensure that SIG (Y+Z) packet can not be repeated, and prevents Replay Attack.
Present invention also offers a kind of Internet of Things lock system, comprise smart lock and controller, described smart lock communicates with between controller, described controller communicates with other internet of things equipment or internet terminal, described smart lock and controller built-in security module respectively, described security module has encryption and decryption functions, and between described smart lock and controller, transmission information all will operate through the encryption and decryption of security module, specifically comprises:
Described smart lock and the built-in security module of controller generate respectively or import a pair unsymmetrical key, wherein private key is stored in described security module, PKI is open to the other side in digital certificate mode after third party CA center certification, also comprises the characteristic of described smart lock in described digital certificate;
When the smart lock/controller as transmit leg sends information X to the controller/smart lock as recipient, adopt encryption and decryption as above mechanism.
Preferably, described security module is a kind of safety chip, is provided with independent processor and memory cell in described safety chip, and described processor is used for carrying out key production and encryption and decryption computing, and described memory cell is for storing characteristic.
Preferably, the information security algorithm of described processor support comprises symmetry algorithm, asymmetric arithmetic and hash and hash algorithm.
Preferably, the packaged type of described safety chip comprises the encapsulation of TF card, adopts the packaged type that this kind ripe, ensure that the stability of packaging technology, improve the quality of intelligent lock system.
As further improvement, described smart lock and controller arrange wireless communication module respectively, and the communication between described smart lock and controller is undertaken by described wireless communication module.
Preferably, described wireless communication module is ZigBee or bluetooth or wifi module.
Internet of Things of the present invention lock system, its smart lock and controller built-in security module respectively, the information that the oriented smart lock of institute sends all will pass through controller, and described information joins equipment from other thing, also may carry out automatic network; The information that smart lock outwards sends also all will through controller.Between smart lock and controller, transmission information all will operate through the encryption and decryption of security module, and its encryption and decryption mechanism is aforesaid encryption and decryption mechanism.Described security module ensure that the fail safe of information encryption and decryption and transmission physically, because information is ciphertext in transmitting procedure, thus prevents information from expressly revealing or being tampered in transmitting procedure, ensure that the confidentiality and integrity of information.
Further, above-mentioned encryption mechanism can in conjunction with ripe PKI/CA system, by third party CA center, by client public key and the binding of other identification informations, carry out subscriber authentication, thus the confidentiality, the integrality that realize to encrypt guarantee information transmission, the authenticity and resisting denying that ensure identity to sign.
Internet of Things lock system of the present invention, employing wireless communication module realizes the communication between smart lock and controller, makes the use of lock more convenient and flexible; Can be connected with other internet of things equipment or the Internet, realize user secured reception lock status information, Long-distance Control smart lock on the equipment such as PC, notebook, mobile phone, add good security performance, the important place that safety requirements is higher can be widely used in, there are good market prospects.
Accompanying drawing explanation
Fig. 1 is the composition schematic diagram of Internet of Things of the present invention lock system;
Fig. 2 is the encryption and decryption schematic flow sheet of symmetric key encryption mode;
Fig. 3 is the encryption and decryption schematic flow sheet of asymmetric-key encryption mode;
Fig. 4 is encryption and decryption of the present invention mechanism schematic flow sheet.
Embodiment
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
The invention provides a kind of encryption and decryption mechanism, its transmit leg and recipient generate respectively or import a pair unsymmetrical key, and wherein private key oneself is preserved, and PKI is open to the other side in digital certificate mode after third party CA center certification;
When sending direction recipient sends information X, specifically comprise the following steps:
A. transmit leg stochastic generation symmetric key K, obtains ciphertext Y with described symmetric key K enciphered message X;
B. the transmit leg PKI PK of recipient
bencrypt described symmetric key K, obtain ciphertext symmetric key Z;
C. described ciphertext Y and ciphertext symmetric key Z is sent to recipient by transmit leg;
D. after recipient receives described ciphertext Y and ciphertext symmetric key Z, with described PKI PK
bcorresponding private key SK
bdecrypt symmetric key K;
E. recipient is with the symmetric key K decrypting ciphertext Y decrypted, and obtains information X.
Above-mentioned encryption and decryption mechanism, combine the mode of symmetric key encryption and asymmetric-key encryption, use symmetric key encryption information itself, adopt symmetric key described in asymmetric-key encryption, thus both overcome the not high defect of symmetric key encryption fail safe, overcome again the problem that asymmetric-key encryption amount of calculation is large, processing speed is slow, ensure that the fail safe of information transmission and ageing simultaneously.
In order to ensure that ciphertext Y and ciphertext symmetric key Z can not be forged by hacker, invention has been further improvement, wherein, in step c, transmit leg is by the private key SK of described ciphertext Y and ciphertext symmetric key Z with oneself
arecipient is sent to SIG (Y+Z) form after signature;
In steps d, after recipient receives described SIG (Y+Z), with transmit leg with described private key SK
acorresponding PKI PK
athe legitimacy of checking SIG (Y+Z); If the content legality of SIG (Y+Z), carries out next step; If illegal, then report an error; Thus ensure that SIG (Y+Z) can not be forged.
If in message transmitting procedure, hacker sends this SIG (Y+Z) packet again to recipient after intercepting and capturing last SIG (Y+Z) packet sent of record; At this moment recipient receives SIG (Y+Z), can be verified and pass through, but the SIG in fact accepted (Y+Z) is the content of command last time, and recipient can think that transmit leg sends again new instruction or data and performed by mistake.Hacker can utilize this leak to manufacture Replay Attack.In order to stop above-mentioned Replay Attack, encryption and decryption mechanism of the present invention is further improved to,
When sending direction recipient sends information X, specifically comprise the following steps:
A. transmit leg stochastic generation symmetric key K and random number x, and obtain ciphertext Y with described symmetric key K enciphered message X;
B. the transmit leg PKI PK of recipient
bencrypt described symmetric key K and random number x, obtain ciphertext symmetric key Z, wherein, Z=PK
b(K+x);
C. transmit leg is by the private key SK of described ciphertext Y and ciphertext symmetric key Z with oneself
arecipient is sent to SIG (Y+Z) form after signature;
D. after recipient receives described SIG (Y+Z), with transmit leg with described private key SK
acorresponding PKI PK
athe legitimacy of checking SIG (Y+Z);
If the content legality of SIG (Y+Z), carries out next step; If illegal, then report an error;
E. after recipient obtains ciphertext Y and ciphertext symmetric key Z, with described PKI PK
bcorresponding private key SK
bdecrypt symmetric key K and random number x, and verify whether described random number x repeats with the last time;
If do not repeat, carry out next step; If repeat, then report an error;
F. recipient is with the symmetric key K decrypting ciphertext Y decrypted, and obtains information X.
In above-mentioned encryption and decryption mechanism, introduce nonce mechanism, when transmit leg sends ciphertext Y and encryption key Z at every turn, also introduce random number x, ensure that SIG (Y+Z) packet can not be repeated, prevent Replay Attack.
An alternative embodiment of the invention provides a kind of Internet of Things lock system, comprises a smart lock and controller.Wherein, smart lock and controller are respectively arranged with wireless communication module, can carry out mutual wireless telecommunications.Preferably, described wireless communication module is ZigBee or bluetooth or wifi module.Meanwhile, controller passes through mode and PERCOM peripheral communication, such as other internet of things equipment or the Internet of Things of wire/wireless.
In order to the fail safe of guarantee information transmission, smart lock and controller are built-in with security module respectively, and this security module has encryption and decryption functions, and require that between smart lock and controller, transmission information all will operate through the encryption and decryption of security module.Security module ensure that the fail safe of information encryption and decryption and transmission physically, because information is ciphertext in transmitting procedure, thus prevents information from expressly revealing or being tampered in transmitting procedure, ensure that the confidentiality and integrity of information.
Concrete, described security module is a kind of safety chip, independent processor and memory cell is provided with in this safety chip, wherein processor is used for carrying out key production and encryption and decryption computing, supports much information security algorithm (the close algorithm of state and international algorithm), includes but not limited to symmetry algorithm (SM1, and asymmetric arithmetic (SM2 DES/3DES), RSA, ECC), hash and hash algorithm (SM3, SHA-1); Memory cell is for storing characteristic.This safety chip adopts TF card packaged type to be encapsulated in smart lock, and this kind of ripe packaged type, ensure that the stability of packaging technology, improve the quality of intelligent lock system.
Above-mentioned Internet of Things lock system, communication between its smart lock and controller adopts cipher mode to carry out, smart lock and controller secure module generate respectively or import a pair unsymmetrical key, wherein private key is stored in security module, PKI is open to the other side in digital certificate mode after third party CA center certification, also comprises the characteristic of described smart lock in described digital certificate; The encryption and decryption mechanism that it adopts is encryption and decryption mechanism aforesaid in the present invention.
Above-mentioned encryption mechanism also in conjunction with ripe PKI/CA system, by third party CA center, by client public key and the binding of other identification informations, can carry out subscriber authentication.Thus the confidentiality, the integrality that realize to encrypt guarantee information transmission, the authenticity and resisting denying that ensure identity to sign, make the Internet of Things in above-described embodiment lock system and can be widely used in the higher important place of safety requirements.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection range of the claims in the present invention.
Claims (9)
1. an encryption and decryption mechanism, transmit leg and recipient generate respectively or import a pair unsymmetrical key, and wherein private key oneself is preserved, and PKI is characterized in that to the other side so that digital certificate mode is open after third party CA center certification,
When sending direction recipient sends information X, specifically comprise the following steps:
A. transmit leg stochastic generation symmetric key K, obtains ciphertext Y with described symmetric key K enciphered message X;
B. the transmit leg PKI PK of recipient
bencrypt described symmetric key K, obtain ciphertext symmetric key Z;
C. described ciphertext Y and ciphertext symmetric key Z is sent to recipient by transmit leg;
D. after recipient receives described ciphertext Y and ciphertext symmetric key Z, with described PKI PK
bcorresponding private key SK
bdecrypt symmetric key K;
E. recipient is with the symmetric key K decrypting ciphertext Y decrypted, and obtains information X.
2. encryption and decryption mechanism as claimed in claim 1, is characterized in that:
In described step c, transmit leg is by the private key SK of described ciphertext Y and ciphertext symmetric key Z with oneself
arecipient is sent to SIG (Y+Z) form after signature;
In described steps d, after recipient receives described SIG (Y+Z), with transmit leg with described private key SK
acorresponding PKI PK
athe legitimacy of checking SIG (Y+Z);
If the content legality of SIG (Y+Z), carries out next step; If illegal, then report an error.
3. encryption and decryption mechanism as claimed in claim 2, is characterized in that:
When sending direction recipient sends information X, specifically comprise the following steps:
A. transmit leg stochastic generation symmetric key K and random number x, and obtain ciphertext Y with described symmetric key K enciphered message X;
B. the transmit leg PKI PK of recipient
bencrypt described symmetric key K and random number x, obtain ciphertext symmetric key Z, wherein, Z=PK
b(K+x);
C. transmit leg is by the private key SK of described ciphertext Y and ciphertext symmetric key Z with oneself
arecipient is sent to SIG (Y+Z) form after signature;
D. after recipient receives described SIG (Y+Z), with transmit leg with described private key SK
acorresponding PKI PK
athe legitimacy of checking SIG (Y+Z);
If the content legality of SIG (Y+Z), carries out next step; If illegal, then report an error;
E. after recipient obtains ciphertext Y and ciphertext symmetric key Z, with described PKI PK
bcorresponding private key SK
bdecrypt symmetric key K and random number x, and verify whether described random number x repeats with the last time;
If do not repeat, carry out next step; If repeat, then report an error;
F. recipient is with the symmetric key K decrypting ciphertext Y decrypted, and obtains information X.
4. an Internet of Things lock system, comprise smart lock and controller, described smart lock communicates with between controller, described controller communicates with other internet of things equipment or internet terminal, it is characterized in that, described smart lock and controller built-in security module respectively, described security module has encryption and decryption functions, between described smart lock and controller, transmission information all will operate through the encryption and decryption of security module, specifically comprises:
Described smart lock and the built-in security module of controller generate respectively or import a pair unsymmetrical key, wherein private key is stored in described security module, PKI is open to the other side in digital certificate mode after third party CA center certification, also comprises the characteristic of described smart lock in described digital certificate;
When the smart lock/controller as transmit leg sends information X to the controller/smart lock as recipient, adopt the encryption and decryption mechanism as described in any one of claim 1-3.
5. Internet of Things lock system as claimed in claim 4, it is characterized in that: described security module is a kind of safety chip, be provided with independent processor and memory cell in described safety chip, described processor is used for carrying out key production and encryption and decryption computing, and described memory cell is for storing characteristic.
6. Internet of Things lock system as claimed in claim 5, is characterized in that: the information security algorithm of described processor support comprises symmetry algorithm, asymmetric arithmetic and hash and hash algorithm.
7. Internet of Things lock system as claimed in claim 5, is characterized in that: the packaged type of described safety chip comprises the encapsulation of TF card.
8. the Internet of Things lock system as described in any one of claim 4-7, it is characterized in that: described smart lock and controller arrange wireless communication module respectively, the communication between described smart lock and controller is undertaken by described wireless communication module.
9. Internet of Things lock system as claimed in claim 8, is characterized in that: described wireless communication module is ZigBee or bluetooth or wifi module.
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