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A dynamic rsa encryption and identification method for ultralight radio frequency cards using time stamps

An encryption method and identification method technology, which is applied in the field of dynamic RSA encryption and identification, can solve problems such as long development cycle, not open to the outside world, complex structure, etc., to improve the difficulty and security of cracking, reduce hardware costs, and reduce development difficulty. Effect

Active Publication Date: 2021-01-05
CHENGDU TME SOFTWARE
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AI Technical Summary

Problems solved by technology

The encryption system of the CPU radio frequency card is relatively complete, but its structure is relatively complicated, and the manufacturers of related operation instructions are not open to the public, which is not friendly to developers, and the development cycle will be relatively long. At the same time, the price of the CPU radio frequency card itself is relatively low. high

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  • A dynamic rsa encryption and identification method for ultralight radio frequency cards using time stamps

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Embodiment Construction

[0032] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings.

[0033] The invention proposes a dynamic RSA encryption method for an Ultralight radio frequency card by using a time stamp.

[0034] Specifically, the following steps are included:

[0035] S11, read the current time, and record the current time as a timestamp;

[0036] S12. Encrypt the time stamp using AES to obtain a time stamp ciphertext; here the key of the symmetric encryption algorithm corresponds to the time stamp, and the correspondence relationship is one-to-one or one-to-many correspondence. For example, in the case of low encryption requirements, the symmetric key can be changed every N days, that is, according to the time of the timestamp, within N days, the same key is used. Moreover, this key can be known in advan...

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Abstract

The invention discloses a dynamic RSA encryption method for an Ultralight radio frequency (RF) card through a time stamp. The method comprises the following steps: recording current time as the time stamp; encrypting the time stamp through AES to obtain time stamp ciphertext; carrying out specific operation on the time stamp to obtain a public key satisfying the RSA algorithm; reading an ID numberof the Ultralight RF card; encrypting the read ID number through the public key to obtain ID number ciphertext; carrying out accumulation and operation on the time stamp ciphertext and the ID numberciphertext to obtain CRC data; and writing the time stamp ciphertext, the ID number ciphertext and the CRC data into a data area of the Ultralight RF card. The invention further discloses a corresponding dynamic RSA identification method for the Ultralight RF card through the time stamp. The encryption method and the identification method provided by the invention have the advantage that the cracking difficulty and the safety of the Ultralight RF card are improved.

Description

technical field [0001] The invention relates to the field of data encryption, in particular to a dynamic RSA encryption and identification method for an Ultralight radio frequency card by using a time stamp. Background technique [0002] For disposable equipment, due to its large output, it is necessary to reduce the increased cost due to the identification function as much as possible, and to minimize the development difficulty and development cycle. Radio frequency cards are often used to identify devices. The mainstream radio frequency cards are M1 radio frequency cards, CPU radio frequency cards, and Ultralight radio frequency cards. [0003] Since the M1 radio frequency card already has a method to crack its encryption system, the general solution when using it is to bind the unique ID number of the radio frequency card to a certain card, and then use the background server to check the relevant information of personnel or equipment. to operate. This solution must use ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L9/30H04L9/08H04L29/06H04L1/00H04L9/06
CPCH04L1/0061H04L9/0631H04L9/0872H04L9/302H04L9/3033H04L63/0442H04L63/0876
Inventor 周海波
Owner CHENGDU TME SOFTWARE
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