Data encryption and decryption methods and devices

A data encryption and data technology, which is applied in digital data protection, electronic digital data processing, computer security devices, etc., can solve the problems of low encryption efficiency and visible pictures, and improve decryption efficiency, encryption efficiency, and decryption efficiency. Effect

Inactive Publication Date: 2011-05-18
PEKING UNIV FOUNDER GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, the existing technology has the problem of low encryption efficiency for the overall encryption of the picture, and the problem of the partial encryption of the picture has the problem that the picture is still visible after encryption

Method used

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  • Data encryption and decryption methods and devices
  • Data encryption and decryption methods and devices
  • Data encryption and decryption methods and devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] The embodiment of the present invention encrypts the data while receiving the data, so that the receiving process and the encryption process are performed simultaneously, and the efficiency is improved. And only part of the data of the file is encrypted, which not only achieves the purpose of encryption, makes the encrypted file invisible, but also shortens the encryption time.

[0035] The files in this embodiment may be picture files or the like. The data to be encrypted can be any data in the file, which can achieve the purpose of making the file invisible after encryption. Any algorithm capable of encrypting partial data (that is, a small number of bytes) is applicable to this embodiment.

[0036] see figure 1 , the main method flow of data encryption in this embodiment is as follows:

[0037] Step 101: Receive data in the form of a data stream. The process of receiving data may receive data from an external device or a network, or read data from a local storage...

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PUM

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Abstract

The invention discloses data encryption and decryption methods, which are used for locally encrypting data to improve encryption efficiency and realizing a corresponding decryption scheme. The data encryption method comprises the following steps of: receiving data in a data stream form; and in the process of receiving data, encrypting data corresponding to preset position information and length information, wherein the data to be encrypted is partial data in file data. The data decryption method comprises the following steps of: receiving data in a data stream form; and in the process of receiving the data, decrypting data corresponding to preset position information and length information, wherein the data to be decrypted is partial data in file data. The invention also discloses devices for implementing the methods.

Description

technical field [0001] The invention relates to the field of computer and information security, in particular to data encryption and decryption methods and devices. Background technique [0002] With the popularity of network applications, information security has attracted more and more attention. Encrypting data is a common means of improving security. [0003] Most of the existing technologies encrypt the entire file, especially the encryption of pictures, and the encryption process involves every pixel in the picture. When the number of pictures is large, or the size of the pictures is large, the encryption efficiency will be very low. [0004] In recent years, existing technology has appeared to encrypt the high-resolution part of the picture. Without decryption, the user can see the low-resolution picture, but the picture is not very clear. After decryption, high-quality pictures can be obtained. This method realizes the encryption of part of the data of the pictur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/24G06F21/62
Inventor 肖一方王威万巍
Owner PEKING UNIV FOUNDER GRP CO LTD
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