Data decryption method for main control chip

Abstract

The invention discloses a data decryption method for a main control chip. The data decryption method is characterized in that the method comprises the following steps: S100, obtaining a data table ofthe main control chip, and reading the layout in the data table; S200, reading underlying data filled with user data in the current block and searching the initial byte; S300, judging whether continuous N-byte content after the initial byte is 0 * FF or not, if so, executing the step S200, and otherwise, executing the step S400; S400, taking the current block as a basic key block; S500, generatinga first block number; S600, judging whether the block numbers taking two bytes as one group in the third block number are progressively increased / decreased or not, if so, executing the step S700, otherwise, addressing the next block, and executing the step S500; S700, judging whether the number of continuously missing block numbers in the third block number is greater than M or not, if so, executing the step S600, and otherwise, executing the step S800; S800, forming a complete key block; and S900, obtaining decrypted data.

Description

technical field [0001] The invention belongs to the field of electronic data restoration and evidence collection, and relates to a data decryption method for a main control chip. Background technique [0002] The encryption algorithm of storage devices such as U disk or solid-state hard disk SSD that contains the main control chip is relatively simple. The key algorithm is mostly basic mathematical operations such as left shift or right shift n bits (n>0), negation, etc., analyze the key generation The algorithm is easier. With the increasing application of storage devices such as U disks or solid-state hard drives (SSDs), coupled with the development of the main control chip, the encryption methods of the main control chip are becoming more and more varied and complex, especially for SSD storage devices with complex encryption and In the event of damage to the interface of the storage device, circuit short circuit, open circuit, component damage, circuit board breakage,...

AI Technical Summary

Problems solved by technology

With the increasingly wide application of storage devices such as U disks or solid-state hard drives (SSDs), coupled with the development of the main control chip, the encryption methods of the main control chip are becoming more and more varied and complex, especially for SSD storage devices with complex encryption and In the event of damage to the storage device interface, circuit short circuit, open circuit, component damage, circuit board breakage, etc., the decryption related to electronic data recovery and forensics is facing increasing challenges

[0003] There is no data decryption method for the main control chip in the prior art, which has caused great difficulties in electronic data recovery and evidence collection of such storage devices containing the main control chip

Therefore, there is an urgent need for a data decryption method for the storage device of this type of main control chip to make up for the shortcomings of electronic data recovery and forensics.

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