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Method for protecting and reading issued data of memory card

A technology for issuing data and memory cards, which is applied in the field of information storage and can solve problems such as complex handshake communication processes, and achieve the effects of reducing software complexity, reducing maintenance costs, and simplifying host device drivers and applications

Active Publication Date: 2008-12-03
SHENZHEN NETCOM ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0008] The disadvantage of the above prior art is that in order for the user program to access the issued data in the private area, special private commands must be customized to access it, and a complicated handshake communication process must be performed

Method used

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  • Method for protecting and reading issued data of memory card
  • Method for protecting and reading issued data of memory card
  • Method for protecting and reading issued data of memory card

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Embodiment Construction

[0038] Below, the present invention is further described in conjunction with the preferred embodiments shown in the accompanying drawings.

[0039]For a better explanation, a brief review of the data storage characteristics in the data area of ​​the FAT file system is first made. A FAT file system usually consists of a master boot record and several FAT partitions. There is usually only one FAT partition on a memory card. The FAT partition is composed of a boot sector (BPB), a FAT1 table, a FAT2 table, a directory area (FDT) and a data area (DATA).

[0040] The boot sector is the first sector of the FAT partition, namely logical sector 0. Such as figure 1 As shown in the example, this sector mainly records the physical parameters of some partitions, including the number of bytes per sector indicated by the address 0011-0012 is 0x200, the number of sectors per cluster indicated by the address 0013 is 0x10, and the number of sectors per cluster indicated by the address 0032-0...

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PUM

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Abstract

The invention relates to a method for protecting and accessing issued data of a memory card, which is used for mass-production memory cards carrying the issued data. The protection method comprises the steps that: a memory card firmware is arranged; a configuration table is written, comprising an IIR table limiting at least one private data area; the memory card is formatted and an FAT file system is established; the issued data is written into the private data area; an interface file is established and the preset position logical address of the interface file data area is provided as the interface address. Therefore, when the memory card is accessed, a read-write mode of a common file can be used for opening the interface file, and reading / writing is carried out to access the preset interface address; preset logical reading / writing operation is executed to generate a handshaking signal so as to access the issued data. By adopting the method, the safety of the issued data is guaranteed, and simultaneously, the use of private orders is avoided, thus effectively simplifying drivers and applications and lowering the maintenance cost of software.

Description

technical field [0001] The present invention relates to information storage technology, in particular to static memory storage technology, especially to a storage and access method for encrypted data on a memory card. Background technique [0002] After digital information is stored, it is easier to be accessed and shared by the public. Based on the increasingly strong protection requirements of content data distributors such as artists, film manufacturers and musicians for these digital information, the 4C (Intel, IBM, Panasonic and Toshiba) alliance developed CPRM (Content Protection for Recordable Media, which can record media content protection) technology. This technology establishes a protection mechanism in which the player device encrypts digital programs when saving them, and decrypts and plays them after reading out the data. The key to realize this mechanism is that the key (KEY) required for encryption / decryption is carried on the recording medium; in this way,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/073
Inventor 蔡华波李志雄钟衍徽
Owner SHENZHEN NETCOM ELECTRONICS CO LTD
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