CN111787535A - NDEF format security dynamic code generation method and device and near field communication method and system - Google Patents
NDEF format security dynamic code generation method and device and near field communication method and system Download PDFInfo
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- CN111787535A CN111787535A CN201910264629.XA CN201910264629A CN111787535A CN 111787535 A CN111787535 A CN 111787535A CN 201910264629 A CN201910264629 A CN 201910264629A CN 111787535 A CN111787535 A CN 111787535A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/04—Key management, e.g. using generic bootstrapping architecture [GBA]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q30/00—Commerce
- G06Q30/018—Certifying business or products
- G06Q30/0185—Product, service or business identity fraud
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0861—Generation of secret information including derivation or calculation of cryptographic keys or passwords
- H04L9/0869—Generation of secret information including derivation or calculation of cryptographic keys or passwords involving random numbers or seeds
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
Abstract
A method and a device for generating NDEF format security dynamic codes and a near field communication method and system solve the problem that plaintext and ciphertext pairs in the existing NFC communication process are easy to attack and crack, and belong to the field of near field communication. The invention relates to a method for generating a safe dynamic code, which comprises the following steps: s1, obtaining unencrypted information of the NFC chip, wherein the unencrypted information and the encryption key have a corresponding relation; s2, acquiring dynamic information, and encrypting by adopting an encryption key, wherein the dynamic information comprises random numbers which change randomly each time; s3, the unencrypted information and the encrypted dynamic information constitute a secure dynamic code in NDEF format. The secure dynamic code further comprises: unencrypted information in S1, signature ciphertext value of dynamic information in S2. The method can also be applied to a safe dynamic code generation device, a near field communication method and a system.
Description
Technical Field
The invention relates to a method for generating an encrypted dynamic code of an NFC (near field communication) tag, belonging to the field of near field communication.
Background
The NFC technology has become the standard configuration of mainstream smart phones, and various application scenarios of NFC are also accepted and familiar to the public. One of the application areas of NFC technology is for the authentication of queries for the identity of goods. The inquiry process generally includes implanting an NFC label into a commodity, and inquiring the authenticity information of the commodity by using a smart phone with an NFC function to approach the label.
At present, various NFC label anti-counterfeiting query technologies exist in the market, one technology is that a mobile phone is provided with an APP, and the APP sends a special anti-counterfeiting key authentication instruction to a label for querying. One is to map dynamically changing codes generated by encryption inside a chip into NDEF Format information, so that an NFC mobile phone can read encrypted codes in NDEF (NFC DataExchange Format, NFC data exchange Format, data Format in NFC tag agreed by NFC organization) data without installing a dedicated APP. If the NDEF is the information in the URL format of the website, the encrypted dynamic code can be used as the parameter of the website and sent to a background server to finish the authenticity authentication.
The second method is more convenient to query, easy to use and suitable for wider NFC mobile phones. The existing method for generating the final dynamic code by mostly adopting the identity information of an NFC chip and reading a count value added with 1 every time for encryption is characterized in that the dynamic code value encrypted by the count value is correspondingly changed every time due to the change of the count value every time, so that the dynamic code is effective in one-time authentication and cannot be copied.
The problem with the above method is that the plaintext used to generate the encrypted dynamic code includes identity information that is known to be invariant and a count value that changes regularly every time 1 is added. When the data ciphertext is transmitted by the space wave, the plaintext is regularly changed, so that the content of the plaintext can be easily deduced, and the plaintext corresponding to the ciphertext can be easily obtained. Such plaintext-ciphertext pairs are vulnerable to attack and hacking.
Disclosure of Invention
Aiming at the problem that plaintext and ciphertext pairs are easy to attack and crack in the existing NFC communication process, the invention provides a method and a device for generating NDEF format safe dynamic codes, which are unpredictable in plaintext and cannot be tampered, and a near field communication method and a near field communication system.
The invention discloses a method for generating NDEF format security dynamic codes, which comprises the following steps:
s1, obtaining unencrypted information of the NFC chip, wherein the unencrypted information and the encryption key have a corresponding relation;
s2, acquiring dynamic information, and encrypting the dynamic information by adopting an encryption key, wherein the dynamic information comprises a count value and a random number which changes randomly each time;
s3, the unencrypted information and the encrypted dynamic information constitute a secure dynamic code in NDEF format.
Preferably, the secure dynamic code further includes: and the signature ciphertext value is the signature ciphertext value of the unencrypted information in the S1 and the dynamic information in the S2.
Preferably, the random number is generated by an NFC chip internal random number generator.
Preferably, the unencrypted information includes a static unique identifier of the NFC chip.
The invention also provides a near field communication method, which comprises the following steps:
receiving a reading request sent by a reader device;
the target device generates a security dynamic code response reading request by sending the security dynamic code generation method.
The invention also provides a computer-readable storage device, wherein the storage device stores a computer program, and the computer program is characterized in that when executed, the method for generating the safe dynamic code is realized.
The invention also provides a device for generating the NDEF format secure dynamic code, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and is characterized in that the processor executes the computer program to realize the method for generating the secure dynamic code.
The invention also provides a device for generating the NDEF format security dynamic code, which comprises:
the NFC chip comprises a first input module, a second input module and a third input module, wherein the first input module is used for inputting unencrypted information of the NFC chip, and the unencrypted information and an encryption key have a corresponding relation;
the second input module is used for inputting dynamic information, and the dynamic information comprises a count value and a random number which changes randomly every time;
the encryption module is connected with the second input module and is used for encrypting the input dynamic information by adopting an encryption key,
and the mapping module is simultaneously connected with the first input module and the encryption module and is used for forming a safe dynamic code in an NDEF format by using the unencrypted information input by the first input module and the encrypted dynamic information obtained by the encryption module.
Preferably, the apparatus further comprises:
the signature module is simultaneously connected with the first input module, the second input module and the mapping module, and is used for generating a signature ciphertext value of the unencrypted information input by the first input module and the dynamic information input by the second input module and sending the signature ciphertext value to the mapping module;
the mapping module is used for forming a safe dynamic code in an NDEF format by using the unencrypted information input by the first input module, the encrypted dynamic information of the encryption module and the signature ciphertext value.
The invention also provides a near field communication system, which comprises a reader device and a target device, wherein any NDEF format safe dynamic code generating device is embedded into the target device, the reader device sends a reading request to the target device, and the target device generates a safe dynamic code by using the NDEF format safe dynamic code generating device and sends the safe dynamic code to the reader device to respond to the reading request of the reader device.
The method has the advantages that the dynamic code comprises the random number which changes randomly when being read each time, the regularity of the plaintext is disordered, the plaintext is unpredictable, and therefore attack on plaintext and ciphertext pairs cannot be realized. The dynamic code also comprises the signature ciphertext value of the unencrypted information and the encrypted information, and the signature ciphertext value ensures that the plaintext of the encrypted information and the encrypted information cannot be tampered.
Drawings
Fig. 1 is a schematic view of embodiment 1.
Fig. 2 is a schematic diagram of the principle of embodiments 2 and 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
In the method for generating a security dynamic code in NDEF format according to this embodiment, the security dynamic code according to this embodiment includes two parts: the NFC encryption device comprises an unencrypted part and an encrypted part, wherein the unencrypted part is unencrypted information of the NFC chip, and the unencrypted information and an encryption key have a corresponding relation; and the authentication background server retrieves the encryption key information corresponding to the NFC chip according to the unencrypted information, so that a tag and a key are realized.
The encryption part is dynamic information, the dynamic information is encrypted by adopting an encryption key to form dynamic codes, and the dynamic information of the embodiment comprises an incremental count value and a random number which changes randomly every time, so that the regularity of the plaintext is disordered, the plaintext is unpredictable, and the attack on plaintext and ciphertext cannot be realized.
In order to prevent interception and tampering of the dynamic code, the embodiment further includes obtaining the signature ciphertext value of the unencrypted information and the dynamic information, and the part is also a code which dynamically changes every time due to the participation of the random number in the operation. The signature ciphertext value ensures that the plaintext of the encrypted dynamic secret information and the unencrypted information cannot be tampered. Mapping the unencrypted information, the dynamic coding and the signature ciphertext value to NDEF format information;
the NFC chip in this embodiment incorporates a random number generator for generating the random number.
The unencrypted information of the embodiment includes a static UID (unique identifier) of the NFC chip, and because the static UID of the chip is a chip unique code that is externally disclosed, the static UID may not participate in the generation of the encrypted dynamic information, but is directly transmitted by a plaintext as a part of the secure dynamic code.
Example 1: with reference to fig. 1, this embodiment is a method for generating an NDEF format secure dynamic code, where a plaintext used by a target device in this embodiment to generate a dynamic code includes three parts, a first part is a static plaintext, a second part is a dynamic plaintext, and a third part is a plaintext of the first part and the second part.
1. In this embodiment, the static plaintext of the first part is the static UID of the NFC chip, and the UID is the unique code of the chip that is externally disclosed, so the UID does not participate in the generation of the encrypted dynamic code, and is not encrypted and directly transmitted.
2. In this embodiment, the dynamic plaintext of the second part includes a count value added by 1 for each reading and a random number generated by a random number generator inside the chip and randomly changed for each reading, and the dynamic plaintext is encrypted by using a secret key of the NFC chip to obtain the dynamic code.
3. The third part of plaintext comprises a static UID of the NFC chip, a count value added with 1 for each reading and a chip internal random number; carrying out digital signature to obtain a signature ciphertext value of a third plaintext;
4. and mapping the static UID of the first part, the dynamic code of the second part and the signature ciphertext value of the third part into NDEF format information to finish the generation of the safe dynamic code.
Example 2: as described with reference to fig. 2, the present embodiment is a near field communication method between a reader device and a target device, where the communication method includes:
receiving a reading request sent by a reader device;
the target device generates a secure dynamic code by sending the secure dynamic code generation method of the embodiment 1, and sends the secure dynamic code to the reader device to complete communication;
after the communication is completed, the reader equipment sends the received safe dynamic code to an authentication background server for anti-counterfeiting inquiry:
the authentication background server retrieves the corresponding encrypted key information of the corresponding chip according to the static UID of the first part, then decrypts the dynamic code and the signature ciphertext value by using the key information, and compares the static UID, the count value and the random number decrypted by the signature ciphertext value with the count value decrypted by the dynamic code, the random number and the static UID directly transmitted by the plaintext to realize anti-counterfeiting query.
Example 3: this embodiment is a computer-readable memory storing a computer program that, when executed, implements the secure dynamic code generation method as described in embodiment 1 above.
Example 4: the present embodiment is an NDEF format secure dynamic code generating apparatus, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the computer program to implement any of the secure dynamic code generating methods of embodiment 1 described above.
Example 5: the present embodiment is an NDEF format security dynamic code generating device, including:
the NFC chip comprises a first input module, a second input module and a third input module, wherein the first input module is used for inputting unencrypted information of the NFC chip, and the unencrypted information and an encryption key have a corresponding relation;
the second input module is used for inputting dynamic information, and the dynamic information comprises a count value and a random number which changes randomly every time;
the encryption module is connected with the second input module and used for encrypting the input dynamic information by adopting an encryption key to form dynamic codes, and the dynamic information of the embodiment comprises an incremental count value and a random number which changes randomly every time, so that the regularity of the plaintext is disordered, the plaintext is unpredictable, and the attack on plaintext and ciphertext pairs cannot be realized.
And the mapping module is simultaneously connected with the first input module and the encryption module and is used for forming a safe dynamic code in an NDEF format by using the unencrypted information input by the first input module and the encrypted dynamic information obtained by the encryption module.
And the authentication background server retrieves the encryption key information corresponding to the NFC chip according to the unencrypted information in the secure dynamic code, so that a tag and a key are realized.
In order to prevent interception and tampering of the dynamic code, the apparatus of this embodiment further includes:
the signature module is simultaneously connected with the first input module, the second input module and the mapping module, and is used for generating a signature ciphertext value of the unencrypted information input by the first input module and the dynamic information input by the second input module and sending the signature ciphertext value to the mapping module;
the mapping module is used for forming a safe dynamic code in an NDEF format by using the unencrypted information input by the first input module, the encrypted dynamic information of the encryption module and the signature ciphertext value. This part is also a code that dynamically changes each time it is generated due to the participation of the random number in the operation. The signature ciphertext value ensures that the plaintext of the encrypted dynamic secret information and the unencrypted information cannot be tampered. Mapping the unencrypted information, the dynamic coding and the signature ciphertext value to NDEF format information; the random number of the present embodiment is generated by an NFC chip internal random number generator. The unencrypted information of this embodiment includes a static unique identifier of the NFC chip.
Example 6: with reference to fig. 2, this embodiment is a near field communication system, where the communication system includes a reader device and a target device, and the NDEF format secure dynamic code generating apparatus in the foregoing embodiment 4 is embedded in the target device;
the reader equipment sends a reading request to the target equipment, the target equipment generates a safe dynamic code by using an NDEF format safe dynamic code generating device and sends the safe dynamic code to the reader equipment, and the reader equipment responds to the reading request of the reader equipment to finish communication;
after communication is completed, the authentication background server is required to perform anti-counterfeiting query, the authentication background server retrieves the encryption key information corresponding to the corresponding chip according to the static UID of the first part, then decrypts the dynamic code and the signature ciphertext value by using the key information, and compares the static UID, the count value and the random number decrypted by the signature ciphertext value with the count value decrypted by the dynamic code, the random number and the static UID directly transmitted by the plaintext to realize the anti-counterfeiting query.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
Claims (12)
1. A method for generating an NDEF format security dynamic code, the method comprising:
s1, obtaining unencrypted information of the NFC chip, wherein the unencrypted information and the encryption key have a corresponding relation;
s2, acquiring dynamic information, and encrypting the dynamic information by adopting an encryption key, wherein the dynamic information comprises a count value and a random number which changes randomly each time;
s3, the unencrypted information and the encrypted dynamic information constitute a secure dynamic code in NDEF format.
2. The method of claim 1, wherein the secure dynamic code further comprises: and the signature ciphertext value is the signature ciphertext value of the unencrypted information in the S1 and the dynamic information in the S2.
3. The method of claim 1 or 2, wherein the random number is generated by an NFC chip internal random number generator.
4. The method of claim 3, wherein the unencrypted information comprises a static unique identifier of the NFC chip.
5. A near field communication method, characterized in that the communication method comprises:
receiving a reading request sent by a reader device;
the target device generates a security dynamic code response read request by sending a security dynamic code generation method according to any one of claims 1 to 4.
6. A computer-readable storage device, in which a computer program is stored, which, when executed, carries out the secure dynamic code generation method according to any one of claims 1 to 4.
7. An NDEF format secure dynamic code generation apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the secure dynamic code generation method according to any one of claims 1 to 4.
8. An apparatus for NDEF format secure dynamic code generation, the apparatus comprising:
the NFC chip comprises a first input module, a second input module and a third input module, wherein the first input module is used for inputting unencrypted information of the NFC chip, and the unencrypted information and an encryption key have a corresponding relation;
the second input module is used for inputting dynamic information, and the dynamic information comprises a count value and a random number which changes randomly every time;
the encryption module is connected with the second input module and is used for encrypting the input dynamic information by adopting an encryption key,
and the mapping module is simultaneously connected with the first input module and the encryption module and is used for forming a safe dynamic code in an NDEF format by using the unencrypted information input by the first input module and the encrypted dynamic information obtained by the encryption module.
9. The NDEF format security dynamic code generating apparatus of claim 8, wherein said apparatus further comprises:
the signature module is simultaneously connected with the first input module, the second input module and the mapping module, and is used for generating a signature ciphertext value of the unencrypted information input by the first input module and the dynamic information input by the second input module and sending the signature ciphertext value to the mapping module;
the mapping module is used for forming a safe dynamic code in an NDEF format by using the unencrypted information input by the first input module, the encrypted dynamic information of the encryption module and the signature ciphertext value.
10. The NDEF format secure dynamic code generating device of claim 8, wherein the random number is generated by an NFC chip internal random number generator.
11. The NDEF format secure dynamic code generating device of claim 8, wherein the unencrypted information comprises a static unique identifier of an NFC chip.
12. A near field communication system, characterized in that the communication system comprises a reader device and a target device, the NDEF format secure dynamic code generating device of any of claims 7 to 11 is embedded in the target device, the reader device sends a read request to the target device, and the target device generates a secure dynamic code by using the NDEF format secure dynamic code generating device and sends the secure dynamic code to the reader device, responding to the read request of the reader device.
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