Security password input system and method based on security touch screen control chip

Abstract

A security password input system based on a security touch screen control chip comprises a touch screen, a display screen, the security touch screen control chip and a system processor. The security touch screen control chip comprises a central processing unit. A FLASH memory, an SRAM (static random access memory), a display control module, a touch screen drive module, a random number module, a symmetric algorithm application module and a serial interface are connected to the central processing unit. The security touch screen control chip is used for encrypting an image of a password input interface, transmitting the image to the display screen for displaying, and encrypting and storing touch information generated by the touch screen; when the system processor sends out a command to read a password, the password is automatically decrypted and transmitted; the image of the password input interface is encrypted and decrypted both in the security touch screen control chip; the system processor is unable to acquire an encryption method of a password key pad, so that system Trojan programs still are unable to analyze the password through image recognition even after capturing the image of the password input interface.

Description

technical field [0001] The invention relates to a security password input system and method based on a security touch screen control chip. Background technique [0002] With the rise of smart phones and tablet computers, touch screens can completely replace electronic keyboards and mice due to their advantages of ease of use, durability, fast response, and space saving, and become an indispensable input and output device for smart terminals. The touch screen is composed of a touch detection part and a touch screen controller: the touch detection part is installed in front of the display screen to detect the user's touch position, and then send it to the touch screen controller; the touch screen controller receives the touch information and converts the information into a touch screen point coordinates. In a system with a touch screen, the system controller receives the contact coordinates sent by the touch screen controller, and converts the coordinate information into real...

AI Technical Summary

Problems solved by technology

Patents WO 2000057262 A, CN 101813992 A, CN 103824033 A and 201410122532.2 do not propose improvement methods for the keyboard information displayed on the touch screen, and attackers can easily analyze the password key value through image recognition technology

Patent 200510025823.0 adopts the method of randomly changing the size, shape and style of the keyboard to improve the anti-attack ability, and has a certain effect on preventing the password input from being peeped, but the Trojan horse program is easy to intercept the password input interface image through the system processor for analysis

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