An RFID tag random number synchronous updating method

An RFID tag, synchronous update technology, applied in the field of radio frequency identification, can solve the problem of high cost of tag production, achieve the effect of saving communication overhead, resisting attacks, and fast computing

CN109766966AActive Publication Date: 2019-05-17GUANGDONG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-05-17

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Abstract

The invention discloses an RFID (Radio Frequency Identification Device) tag random number synchronous updating method, which generally needs to keep the freshness of a message through a random numberin an authentication process of an RFID tag, so as to prevent tracking attack and desynchronization attack on the tag. Due to the computing power of the tag, a common random number generator is difficult to be used in the tag, so that the design of a simple random number updating method of the tag is of great significance. In the random number updating method provided by the invention, a method for generating a new random number by using a random number sent by a reader-writer at a tag end in combination with an encryption function of a tag and initializing a shared random number is provided.According to the method, the freshness of information fed back by the tag each time can be ensured, various attacks such as desynchronization attacks and the like for the RFID tag can be resisted, andthe safety in the RFID authentication process and the generation efficiency of a tag random number are improved.
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Description

technical field

[0001] The invention relates to the technical field of radio frequency identification, in particular to a method for synchronously updating random numbers of RFID tags. Background technique

[0002] Radio Frequency Identification (RFID), also known as radio frequency identification, is a non-contact identification technology that can identify specific targets through radio signals and read and write related data without physical contact with the target object. RFID has been widely used in many fields, such as logistics, military, transportation and so on.

[0003] RFID usually consists of three parts: tags, readers and back-end databases. The communication channel between the backend database and the reader is generally considered to be secure and reliable. The channel between the reader and the tag is vulnerable to eavesdropping and spoofing due to the lack of protection due to the wireless connection. With the development of RFID technology, more and mor...

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific embodiment:

[0024] In the method for synchronously updating the random number of the RFID tag described in this embodiment, CRC is used as the encryption algorithm of the RFID.

[0025] Such as figure 1 As shown, the specific steps are as follows:

[0026] S1: The tag reader first shares a random number r n and related encryption keys, and then the reader and tag perform related authentication operations;

[0027] S2: In the authentication stage of the reader to the tag, the reader first generates a random number N by itself 1 , encrypted with related information and keys and sent to the tag;

[0028] S3: The tag decrypts the random number N after receiving the information 1 , and use it for new random number generation: r n+1 =F(r n ⊕N 1 ); then r n+1 Combine the key to encrypt the verification information, send it to the reader, and update the shared random number when the tr...