Method for Safe Update of Multi-information Block of Contactless IC Card

Abstract

The invention relates to a non-contact IC card multi-information block safety update method, firstly read two sign blocks each time the card is read, and determine the effective sign blocks; read each information block according to the current pointer to obtain card information; business logic processing After completion, add 1 to the information block pointer as the current pointer (modulo 2), write the modified information into the card storage location pointed by the current information block pointer; add 1 to the flag block pointer (modulo 2) as the current flag block pointer, and write The content of the new marker block is written to the position pointed by the current marker block pointer; the last marker block pointer plus 1 (modulo 2) is used as the current pointer, the valid flag of the marker block is cleared, and the content of the marker block is written into the position pointed to by the current marker block pointer storage location. Since there is no backup concept, so-called card data backup and card data recovery problems do not exist, thereby reducing the complexity of card processing, and no longer need to read and write backup data and card recovery processing time.

Description

technical field [0001] The invention relates to a method for safely updating multiple information blocks of a non-contact IC card. Background technique [0002] In the application field of contactless IC cards, in a complete card transaction process, most application systems need to update several independently operated information blocks. In order to ensure the integrity and consistency of card data, it is necessary to take a security update operation on the card. [0003] In order to solve the problem of security update of multiple information blocks of non-contact IC cards, the card structure is usually designed as follows: 1), define the flag block and its backup block, and define a process flag for each independent information block in the flag block; 2) ), define information blocks, and define a backup block for each information block. When the card operation starts, it is necessary to read the card and check whether the last operation is completed. If it is not compl...

AI Technical Summary

Problems solved by technology

Although the above process can realize the safe update of multiple information blocks of the non-contact IC card, it has the following defects: 1) When the card update process is not completed normally, the card recovery process is required to read the card again, and the processing of different recovery points is complicated The speed and consumption time are different;

[0005] 2) When updating, it is necessary to write an additional backup block of the information block, which consumes additional card operation time and post-write read verification time; 3) The verification of the process is complicated and there are many check points

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