A data safe deletion method based on flash memory solid-state disk

Abstract

The invention discloses a secure deletion method for data in a solid-state disk on the basis of a flash memory. The characteristic that multiple data channels in the solid-state disk can be operated in parallel is utilized, an improved secrete sharing scheme is adopted to conduct conversion processing on data, and encoded data is distributed to all the data channels; on one hand, data redundancy is guaranteed through encoding, the converted data is ciphertext, and the reliability and the security of the data are improved; on the other hand, the error-resilient encoding characteristic is utilized, covering on the whole data is not needed any more for deletion of the data, partial data is deleted, the data integrity is destroyed, and the data cannot be recovered. Even though an attacker obtains partial encoded data, the attacker cannot obtain plaintext, and the purpose of securely deleting the data is achieved. By means of the secure deletion method for the data in the solid-state disk on the basis of the flash memory, the data storage security problems that storage of the solid-state disk is unreliable, and files cannot be deleted securely are solved.

Description

technical field [0001] The invention belongs to the technical field of computer data storage, and more particularly relates to a method for safely deleting data of a solid-state disk based on a flash memory. Background technique [0002] The reliability of solid-state disks (SSDs) is facing a test. According to surveys, although solid-state disks have improved performance, their reliability is not stronger than that of traditional hard disks. The investigation is mainly aimed at Intel's solid-state drives. Many users are concerned about the write limit of SSDs, when in reality it is usually other failures that are causing the problem. [0003] Internally, the solid-state disk adopts an off-site update operation mode. When users use security software to safely delete files in the solid-state disk, all overwriting operations on the target data will be transferred to new free physical pages. As a result, sensitive target data is not physically overwritten or erased, but merel...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention proposes a method for securely deleting data of a solid-state disk based on flash memory, and introduces the basic principle of a secret sharing mechanism into it. By destroying the redundancy capability of each channel data on the solid-state disk, Combined with the data conversion processing operation, after the integrity of the data is destroyed, the remaining data is encrypted. Even if the attacker obtains part of the encoded data, he cannot obtain the plaintext, so as to achieve the purpose of safely deleting the data. The off-site update feature of the solid-state disk makes data unable to be safely deleted, data storage security issues of the solid-state disk, and a large number of overwrites affect the life of the flash memory and wear balance, etc.

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