Data fast erasing method for large-capacity non-volatile memory
A non-volatile and memory technology, applied in the field of data security, can solve the problems of long time, large amount of stored data, and consumption, and achieve the effect of preventing effective recovery and ensuring data security
Active Publication Date: 2019-09-13
TIANJIN UNIV
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Problems solved by technology
However, the data security of large-capacity storage is often not guaranteed
For some storage systems that store programs or files, such as FPGA configuration memory chips, the amount of stored data is large, and it takes a long time to use ordinary erasing methods
Taking the EPCS4 memory chip as an example, for the Erase Bulk operation, it takes up to 10s to erase the entire Flash chip as a whole block, and it takes up to 24s to erase the areas sequentially using Erase Sector, and the general fast attack method can Unpack within 2 to 3 seconds, take out the battery, and paralyze the protection system
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[0042] The present invention proposes a method for quickly erasing data suitable for large-capacity non-volatile memory. This method calculates the number of data pages that need to be overwritten when the user writes a file, and selects the number of data pages in the storage area of the file. A corresponding number of random addresses are written into the special memory; when attacked, the addresses in the special memory are read sequentially, and the page overwrite random number operation is performed, which destroys the integrity of the file data in a short time, so that the attacker cannot Restore all data to achieve the purpose of erasing files.
[0043]Aiming at the problem that the large-capacity non-volatile memory block erasing and the erasing time of the overall erasing method are too long, the present invention proposes a short-term and efficient erasing method based on page overwriting, which includes three sub-processes: normal Write, Normal Erase, Quick Erase....
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The invention relates to the field of data security and provides a data fast erase method for a large capacity nonvolatile memory. According to the data fast erase method, the integrity of a file is destroyed in a short time, when the large capacity memory is attacked, effective data can thus be destroyed quickly to ensure that the original file cannot be read maliciously and the data security of a memory chip is thus guaranteed. The data fast erase method for the large capacity nonvolatile memory includes such two parallel subprocesses as a normal erase operation and a fast erase operation, and the two parallel subprocesses need to be selected according to the actual situation; the normal erase subprocess is applicable to the case in which the user normally erases the nonvolatile memory, that is, only the normal erase step is adopted when the large capacity memory is not attacked; the fast erase subprocess is applicable to the case in which the memory is attacked, and only the fast erase step is adopted when the memory is attacked. The data fast erase method is mainly applied to ensuring the chip data security.
Description
technical field [0001] The invention relates to the field of data security, in particular to a short-time and high-efficiency erasing method for large-capacity non-volatile memory. Background technique [0002] With the rapid development of microelectronics technology, memory chips have been widely used in various fields of society due to their advantages of large capacity, small size, and fast transmission rate. However, the data security of mass storage is often not guaranteed. For some storage systems that store programs or files, such as FPGA configuration memory chips, the amount of stored data is relatively large, and it takes a long time to use a common erasing method. Taking the EPCS4 memory chip as an example, for the Erase Bulk operation, it takes up to 10s to erase the entire Flash chip as a whole block, and it takes up to 24s to erase the areas sequentially using Erase Sector, and the general fast attack method can Unpack within 2 to 3 seconds and take out the ...
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IPC IPC(8): G11C16/16G06F12/02
Inventor 赵毅强辛睿山王佳李跃辉赵公元
Owner TIANJIN UNIV