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Method and device for file encrypting/decrypting

A technology of file encryption and encryption algorithm, which is applied in the direction of computer security devices, public keys for secure communication, instruments, etc., can solve problems such as low computing power, slow system response speed, and unsatisfactory encryption methods, so as to increase difficulty and reduce Encryption calculation amount, the effect of improving encryption speed and encryption efficiency

Inactive Publication Date: 2013-09-11
BEIJING QIHOO TECH CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the user has high performance requirements for the file encryption processing method in terms of encryption processing capability, and the computing capability of the device used is relatively low—for example, encrypting the photos taken in the mobile terminal—this type of encryption The method does not meet the needs of users, especially
In this case, it should also be considered that when system resources are heavily used for encryption calculations that require a large amount of computing power, encryption operations will also affect the operation of other files, resulting in an overall decrease in system response speed

Method used

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  • Method and device for file encrypting/decrypting
  • Method and device for file encrypting/decrypting
  • Method and device for file encrypting/decrypting

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Embodiment Construction

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0061] see image 3 , which is a flowchart of an embodiment of a file encryption method provided by the present invention. In this embodiment, the following steps are included:

[0062] Step S300 is the start.

[0063] Step S301 is to determine the source file to be encrypted.

[0064] The determination of the source file to be encrypted may be determined according to the importance of the file itself, or according to the user's requirement on the importance of the file.

[0065] Step S30...

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Abstract

The invention provides a method and device for file encrypting / decrypting. The encrypting method includes the steps that a source file to be encrypted is determined; important data in the source file are selected; encrypting is carried out on the important data according to a set encryption algorithm; at a specified first position, the encrypted important data are stored; unencrypted important data in the source file are deleted; encrypted information is stored at a specified position; the encrypted information at least includes original positions of the important data in the source file. Relative to the encrypting method, a decrypting method, an encrypting device and a decrypting device are further provided, due to the fact that local encrypting is achieved, when decrypting is carried out, a user needs to know whether the encrypted important data exist in the source file or not and needs to know the storage position of the encrypted data, and therefore decrypting difficulty is increased.

Description

technical field [0001] The invention relates to the field of computer application technology, in particular to a file encryption method and a decryption method corresponding to the file encryption method; the invention also relates to a file encryption device and a decryption device corresponding to the file encryption device. Background technique [0002] File encryption is a technology that encrypts data written to storage media at the operating system layer upon request. [0003] File encryption can be divided into two categories according to the encryption method: one is the file encryption function that comes with the system; the other is the encryption function realized by the encryption algorithm. [0004] In general, data encryption refers to converting plaintext into ciphertext through encryption algorithm and encryption key, and decryption refers to restoring ciphertext to plaintext through decryption algorithm and decryption key. Specifically, the protection of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/60
CPCG06F2221/2107G06F21/6209H04L9/30
Inventor 曹建峰周晨光赵江
Owner BEIJING QIHOO TECH CO LTD
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