CN102005245B - Intelligent card erasing and writing protection method - Google Patents
Intelligent card erasing and writing protection method Download PDFInfo
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- CN102005245B CN102005245B CN201010566258.XA CN201010566258A CN102005245B CN 102005245 B CN102005245 B CN 102005245B CN 201010566258 A CN201010566258 A CN 201010566258A CN 102005245 B CN102005245 B CN 102005245B
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Abstract
The invention aims at disclosing an intelligent card erasing and writing protection method. When an intelligent card begins the erasing and writing operation, a data located block is backed up to a backup region before target address data is modified. Meanwhile, because the backup region is frequently erased and written and is easy to damage, the address of the damaged backup region is allowed to be changed; a backup mark of the backup region singly occupies one block, new addresses are sequentially written in the block during the updating in each time, the block erasing operation can be executed after the block is full, and then, the new addresses are written in from the beginning, so the modification time of the backup mark can be saved, and the goal of the intelligent card erasing and writing protection can be realized.
Description
Technical field
The present invention relates to a kind of erasable guard method, the particularly erasable guard method of a kind of smart card of field of intelligent cards.
Background technology
At present, the smart card of domestic use, along with the continuous expansion of application item function and the quickening of the pace of product renewal, traditional (as ROM etc.) CPU smart card gradually replace by new-type Flash fast flash memory bank CPU smart card.
And flash storage often needs the erasable operation carrying out data, be generally first wipe legacy data, then write new data; But, will powered-off fault be faced in erasable process, cause the exception of data.
In sum, for the defect of prior art, the erasable guard method of a kind of smart card of special needs, solves the problem of the erasable power down protection of smart card Flash.
Summary of the invention
The object of the present invention is to provide the erasable guard method of a kind of smart card, for the defect of above-mentioned prior art, making system when surprisingly losing power supply, the determinacy of system running state and the integrality of record data can be ensured; After system power supply recovers, field data can be recovered in time, avoids application system confusion reigned.
Technical matters solved by the invention can realize by the following technical solutions:
The erasable guard method of a kind of smart card, it is characterized in that, it comprises the steps:
1), when smart card starts erasable operation, check global variable mark, check whether power down and judge data block and backup area whether normal;
2) if this global variable mark is effective, then read object block content and copy in backup block, starting the erasable operation of backup block;
3) if this global variable mark is invalid, then read backup block sequence number to global variable mark, read object block content and copy in this backup block, starting the erasable operation of backup block;
4) back up successfully if this backup block is erasable, then calculate object block number, new backup mark is set, then starts to carry out data erase and write operation to object block;
5) reset backup mark, completes erasable protection operation;
6) if the erasable backup failure of this backup block, then upgrade backup block number, re-start backup and start the erasable operation of backup block.
In one embodiment of the invention, backup area backup sign retouching operation comprises the steps:
1), when carrying out the erasable operation of the backup mark block of backup block, first check global variable, determine whether 0;
2) if global variable is judged as 0, then represent that this block is fully written, start erasing mark place block, to global variable place write backup mark, its value divides exactly block size value for (global variable+4), and amendment backup mark terminates;
3) if global variable judges not to be 0, then directly to global variable place write backup mark, its value divides exactly block size value for (global variable+4), and amendment backup mark terminates.
In one embodiment of the invention, before smart card carries out data backup, check that backup area backup indicates.
In one embodiment of the invention, smart card carry out data backup block erasable before, check backup block remaining space.
In one embodiment of the invention, smart card carry out data backup block erasable time, upgrade backup block number.
In one embodiment of the invention, smart card carry out data backup block erasable time, damage after allow change backup area address.
In one embodiment of the invention, when smart card carries out data backup block operations, only have when backup mark block writes the just erasable operation of execution backup mark block completely.
The erasable guard method of smart card of the present invention, when smart card starts erasable operation, before modifying target address date, backups in backup area by this data place block; , because backup area is often erasable, easily damage meanwhile, allow after damaging to change backup area address; The backup mark of backup area takies separately a block, each new address when upgrading successively in write-in block, only have when this block write full after just perform this block erase operation, more from the beginning to write, the time of backup mark amendment can be saved like this, realize object of the present invention.
The detailed description and obtaining that feature of the present invention can consult the graphic and following better embodiment of this case is well understood to.
Accompanying drawing explanation
Fig. 1 is the FB(flow block) of the erasable guard method of smart card of the present invention;
Fig. 2 is the process principle figure that backup area of the present invention backup indicates retouching operation.
Embodiment
The technological means realized to make the present invention, creation characteristic, reaching object and effect is easy to understand, below in conjunction with concrete diagram, setting forth the present invention further.
As shown in Figure 1, the erasable guard method of smart card of the present invention, it comprises the steps:
1), when smart card starts erasable operation, check global variable mark blk_seq, check whether power down and judge data block and backup area whether normal;
2) if this global variable mark blk_seq is effective, then read object block content and copy in backup block, starting the erasable operation of backup block;
3) if this global variable mark blk_seq is invalid, then read backup block sequence number to global variable mark blk_seq, read object block content and copy in this backup block, starting the erasable operation of backup block;
4) back up successfully if this backup block is erasable, then calculate object block number, new backup mark is set, then starts to carry out data erase and write operation to object block;
5) reset backup mark, completes erasable protection operation;
6) if the erasable backup failure of this backup block, then upgrade backup block number, re-start backup and start the erasable operation of backup block.
In the present invention, before smart card carries out data backup, check that backup area backup indicates.
In the present invention, smart card carry out data backup block erasable before, check backup block remaining space.
In the present invention, smart card carry out data backup block erasable time, upgrade backup block number.
In the present invention, smart card carry out data backup block erasable time, damage after allow change backup area address.
In the present invention, when smart card carries out data backup block operations, only have when backup mark block writes the just erasable operation of execution backup mark block completely.
For the operation of backup area backup block, particularly to the erasable operating process of backup mark block, because backup area is often erasable, easily damage, allow after damaging to change backup area address; Backup mark (4 byte) takies separately a block, each new address when upgrading successively in write-in block, only have when this block write full after just perform this block erase operation, more from the beginning to write, the time of backup mark amendment can be saved like this.
As shown in Figure 2, in the present invention, backup area backup sign retouching operation comprises the steps:
1), when carrying out the erasable operation of the backup mark block of backup block, first check global variable flag_offset, determine whether 0;
2) if global variable flag_offset is judged as 0, then represent that this block is fully written, start erasing mark place block, to global variable flag_offset place write backup mark, its value divides exactly block size value (blksize) for (global variable flag_offset+4), and amendment backup mark terminates;
3) if global variable flag_offset judges not to be 0, then directly to global variable flag_offset place write backup mark, its value divides exactly block size value (blksize) for (global variable flag_offset+4), and amendment backup mark terminates.
More than show and describe ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications; these changes and improvements all fall in the claimed scope of the invention, and application claims protection domain is defined by appending claims and equivalent thereof.
Claims (5)
1. the erasable guard method of smart card, it is characterized in that, it comprises the steps:
1), when smart card starts erasable operation, check global variable mark, check whether power down and judge data block and backup area whether normal;
2) if this global variable mark is effective, then read object block content and copy in backup block, starting the erasable operation of backup block;
3) if this global variable mark is invalid, then read backup block sequence number to global variable mark, read object block content and copy in this backup block, starting the erasable operation of backup block;
4) back up successfully if this backup block is erasable, then calculate object block number, new backup mark is set, then starts to carry out data erase and write operation to object block;
5) reset backup mark, completes the erasable protection operation of backup block;
6) if the erasable backup failure of this backup block, then upgrade backup block number, re-start backup and start the erasable operation of backup block;
When smart card starts erasable operation, before modifying target address date, this data place block is backuped in backup area; Backup mark takies separately a block, each new address when upgrading successively in write-in block, only have when backup home block write full after just perform and back up home block erase operation, more from the beginning to write; Backup area backup block, in the erasable operating process of backup home block, allows to change backup area address after backup area damages.
2. the erasable guard method of smart card as claimed in claim 1, is characterized in that, the erasable operation of backup area backup mark comprises the steps:
1), when carrying out the erasable operation of the backup home block of backup block, first check global variable, determine whether 0;
2) if global variable is judged as 0, then represent that backup home block is fully written, start erasing mark place block, to global variable place write backup mark, its value divides exactly block size value for (global variable+4), and amendment backup mark terminates;
3) if global variable judges not to be 0, then directly to global variable place write backup mark, its value divides exactly block size value for (global variable+4), and erasable backup mark terminates.
3. the erasable guard method of smart card as claimed in claim 1, is characterized in that, before smart card carries out data backup, checks backup area backup mark.
4. the erasable guard method of smart card as claimed in claim 1, is characterized in that, smart card carry out data backup block erasable before, check backup block remaining space.
5. the erasable guard method of smart card as claimed in claim 1, is characterized in that, smart card carry out data backup block erasable time, upgrade backup block number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201010566258.XA CN102005245B (en) | 2010-11-30 | 2010-11-30 | Intelligent card erasing and writing protection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010566258.XA CN102005245B (en) | 2010-11-30 | 2010-11-30 | Intelligent card erasing and writing protection method |
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| CN102005245A CN102005245A (en) | 2011-04-06 |
| CN102005245B true CN102005245B (en) | 2015-07-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI520153B (en) * | 2013-11-05 | 2016-02-01 | 威盛電子股份有限公司 | Non-volatile memory device and operation method thereof |
| CN103744746B (en) * | 2013-12-30 | 2016-08-03 | 北京工业大学 | A kind of intelligent card records backup based on index and restoration methods |
| CN104778133B (en) * | 2014-01-09 | 2017-09-22 | 苏州融卡智能科技有限公司 | Increase the method in smart card programmable read only memory life-span |
| CN106445851A (en) * | 2016-08-26 | 2017-02-22 | 北京中电华大电子设计有限责任公司 | Method for improving interface response capability of Flash NFC-SIM smart card |
| CN112131040B (en) * | 2020-09-30 | 2022-02-11 | 郑州信大捷安信息技术股份有限公司 | Wear balance management method and system for power-down backup area of smart card |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101226604A (en) * | 2007-01-19 | 2008-07-23 | 东信和平智能卡股份有限公司 | Smart card and data write-in method |
| CN101382918A (en) * | 2008-07-26 | 2009-03-11 | 深圳市硅格半导体有限公司 | NAND flash memory optimizing and managing method based on data interchange zone |
| CN101876927A (en) * | 2009-11-30 | 2010-11-03 | 北京握奇数据系统有限公司 | Power-off protection method for realizing FAT32 file system, and device thereof |
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- 2010-11-30 CN CN201010566258.XA patent/CN102005245B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101226604A (en) * | 2007-01-19 | 2008-07-23 | 东信和平智能卡股份有限公司 | Smart card and data write-in method |
| CN101382918A (en) * | 2008-07-26 | 2009-03-11 | 深圳市硅格半导体有限公司 | NAND flash memory optimizing and managing method based on data interchange zone |
| CN101876927A (en) * | 2009-11-30 | 2010-11-03 | 北京握奇数据系统有限公司 | Power-off protection method for realizing FAT32 file system, and device thereof |
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| CN102005245A (en) | 2011-04-06 |
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