Light-weight file encryption and decrypting and recovering method in NTFS file system

A file system and file encryption technology, which is applied in the field of information security, can solve the problem of no file system optimization file encryption protection effect, and achieve the effect of protecting integrity and credibility, high efficiency, and system friendliness

CN101634992BInactive Publication Date: 2011-04-13SHANGHAI JIAOTONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-04-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

A light-weight file encryption and decrypting and recovering method in an NTFS file system belongs to the technical field of information security. The method comprises the following steps: selecting a proper data block replacement method to overwrite data following the attribute of a file referred to by a legal file path according to encryption options selected by a user, and storing a seed generating a random data block replacement sequence; then generating a reverse replacement sequence according to the seed generating the random data block replacement sequence to overwrite the data of a file referred to by a legal file path, thus recovering raw data. The method helps achieve the purposes of encrypting light-weight files and preventing file reconstruction and data intrusion by optimallyselecting random replacement file data blocks according to structural properties of the NTFS file system.
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Description

technical field

[0001] The invention relates to an encryption and decryption recovery method in the technical field of information security, in particular to a lightweight file encryption and decryption recovery method under an NTFS file system. Background technique

[0002] Today, large-capacity storage devices have been widely used in various fields of society along with the development of information and networked society. Government agencies, school academic institutions, commercial companies, and individual users all rely on reliable storage devices to varying degrees; especially the first three types of computer users, the security, credibility and confidentiality of important data information stored in storage media is the most concerned issue. The main goal of data protection is to prevent data tampering and data theft by illegal attacks. Various viruses and other attack methods rewrite the data content to make the data untrustworthy, so as to achieve their own ill...

Examples

Embodiment Construction

[0066] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0067] like figure 1 and figure 2 As shown, the lightweight file encryption method under the NTFS file system in the present embodiment specifically includes the following steps:

[0068] S1: Obtain the encryption mode and password selected by the user;

[0069] S2: Obtain the encrypted file path, check the legality, parse and decompose the path name;

[0070] S3: Analyze the boot sector and read the key system metadata of the NTFS file system;

[0071] S4: Find the entry table of the specific record file index and traverse the file index to obtain the index record entry of the hidden file;

[0072] S5: Accor...