A method and system for safely deleting data based on ssd deduplication technology

A technology for safe deletion and data security, which is applied in the direction of electrical digital data processing, data processing input/output process, instruments, etc., to achieve the effect of reducing overhead and reducing impact

Active Publication Date: 2019-12-06
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

But this will bring about the question of whether file A is really safely deleted

Method used

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  • A method and system for safely deleting data based on ssd deduplication technology
  • A method and system for safely deleting data based on ssd deduplication technology
  • A method and system for safely deleting data based on ssd deduplication technology

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Embodiment Construction

[0060] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0061] Such as figure 2 Shown, the inventive method comprises the following steps:

[0062] (1) Judging the user request, if it is a write request, then enter step (2); if it is a delete request, then enter step (4);

[0063] (2) Look up the address mapping table according to the logical address L of the write request, if it hits, keep the mapping from the logical address L to the data block,...

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PUM

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Abstract

The invention discloses a safe deletion method and system for data on the basis of an SSD (Solid State Drives) duplication removal technology, and belongs to the field of SSD storage control. The method comprises the following steps that: when data is written, the written data is subjected to an update operation, an original mapping relationship is firstly marked to be ineffective, then, on the basis of duplication removal, data writing is carried out, and meanwhile, the metadata of the written data is revised; when the data is deleted, firstly, the safe deletion of the data is carried out to delete relevant physical page PPN (Physical Page Number) data and the mapping relationship; and then, the safe deletion of the metadata is carried out to thoroughly eliminate traces. The invention also provides a safe deletion system for the data on the basis of the SSD duplication removal technology. By use of the method and the system, the data duplication removal technology is used for reducing expenditures brought by the safe deletion, meanwhile, the metadata is safely deleted to solve the problem that a block is not safely deleted since the block is quoted by other files, and the deleted file is guaranteed to thoroughly execute the safe deletion.

Description

technical field [0001] The invention belongs to the field of SSD storage control, and more specifically, relates to a method and system for safely deleting data based on SSD deduplication technology. Background technique [0002] With the development of data recovery technology, the deletion of files by the current computer operating system has become unreliable. By recovering and processing the remaining data on the storage medium, attackers can steal the deleted confidential information, which has become a threat to storage system information. important safety hazard. In 2016, Blancco Technology Group made a survey report. They purchased more than 200 second-hand hard drives (93% were mechanical hard drives and the rest were SSDs) from eBay and Craigslist, and found that more than 78% of the second-hand hard drives had residual data, of which 67% of hard drives can recover personal confidential information, and 11% of hard drives contain sensitive company data. In additi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/06
CPCG06F3/0608G06F3/0641G06F3/0679
Inventor 童薇刘景宁冯丹雷霞方才华魏学亮高阳蒋瑜
Owner HUAZHONG UNIV OF SCI & TECH
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