Encryption and decryption methods and devices of sliding track background picture

Abstract

The invention provides encryption and decryption methods and devices of a sliding track background picture. The encryption method of the sliding track background picture includes: receiving a verification-code acquisition request sent by a client, and generating the original sliding track background picture according to the verification-code acquisition request; randomly dividing the original sliding track background picture into a plurality of division blocks, and using a randomly generated encryption factor to carry out out-of-order arrangement on the plurality of division blocks of the sliding track background picture; and encoding the encryption factor and a sliding track background image after out-of-order arrangement according to a set encoding mode to generate corresponding encrypted character strings, and returning the same to the client. According to the encryption and decryption methods and devices of the sliding track background picture provided by the embodiment of the invention, track background picture contents can be directly returned, a link form is not used, and server realization complexity is reduced; and the encryption method adopts out-of-order encryption and dynamic encryption, and greatly increases cracking costs and difficulty of a cracker.

Description

technical field [0001] The invention relates to the field of encryption and decryption of data, in particular to a method and device for encryption and decryption of a slide track background picture. Background technique [0002] When the user browses the webpage or performs webpage operations, sometimes the browser will initiate a jsonp verification code request to the server to obtain a track background map of the sliding track, to prompt the user to slide along the track on the map to pass the verification. [0003] If no encryption method is used for the background picture of the sliding track, an attacker trying to crack the verification code can easily obtain the background picture of the track, and then conduct subsequent analysis to obtain the track in the picture to realize automatic cracking of the verification code, making the verification code lose the identity of the person function of the machine. [0004] It should be noted that the above introduction of the ...

AI Technical Summary

Problems solved by technology

[0003] If no encryption method is used for the background picture of the sliding track, an attacker trying to crack the verification code can easily obtain the background picture of the track, and then conduct subsequent analysis to obtain the track in the picture to realize automatic cracking of the verification code, making the verification code lose the identity of the person The role of the machine

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