Method and system for preventing mobile phone from being controlled in non-call state

Abstract

The invention discloses a method and a system for preventing a mobile phone from being controlled in a non-call state. The system comprises a microphone, a power amplification circuit, a manual switch, an analog-to-digital circuit and a signal processing circuit. The microphone converts sound into analog electric signals, the analog electric signals are sent to the power amplification circuit through the signal line to be amplified and then transmitted to the analog-to-digital circuit through the signal line to be discretely sampled and converted into digital signals, the digital signals are transmitted to the signal processing circuit through the bus to be coded, compressed, modulated and the like, and baseband signals are provided for follow-up wireless communication transmission of a mobile phone. And the manual switch is connected in series on a signal line or a bus between the microphone and the signal processing circuit. In a non-call state, the manual switch is manually switched off, so that audio signals from the microphone cannot enter the signal processing circuit, the situation that viruses, Trojan software or malicious software steal audio information from the signal processing circuit is completely eradicated physically, and compared with other known solutions, the method has the advantages of being easy to implement, low in cost and more effective.

Description

technical field [0001] The invention belongs to the technical field of information security, and relates to a method and system for preventing a mobile phone from being manipulated in a non-communication state. Background technique [0002] Smartphones have been deeply integrated into all aspects of modern people's production, management, life, and social interaction, and have become an indispensable tool for communication, leisure and entertainment that people carry with them. While bringing a lot of fun and convenience to people, smart phones are also very easy to be used by criminals to steal personal privacy and steal national / commercial secrets. The most common method used by criminals is to obtain the recording authority of smartphones through various viruses, read the digital audio signal in the signal processing circuit, turn the microphone of the mobile phone into a bug, record the conversations and background sounds of surrounding people at any time, and obtain sen...

AI Technical Summary

Problems solved by technology

The principle of this scheme is feasible, but there are some problems in its implementation: firstly, the integration of mobile phones is getting higher and higher. In order to ensure the lightweight and compact structure of mobile phones, an integrated design of functions is required. One DC power module supplies power to multiple types of equipment, such as It is necessary to supply power to the handset, camera, frequency mixing circuit, signal processing circuit, etc. at the same time. At this time, using a physical switch to control the power supply of the DC power module will cause other devices on the mobile phone to fail to work normally; Issues such as cost, volume, power consumption, and heat generation increase

Secondly, in order to realize the design of this solution without affecting the normal operation of other devices on the mobile phone, it is necessary to configure a DC power module for the microphone separately. The mobile phone circuit needs to focus on the power consumption, electromagnetic compatibility, thermal stability, etc. To redesign, the complexity, workload and cost of implementation increase

Furthermore, the DC power module is connected to the power supply of the mobile phone through a physical switch. The on-off of the physical switch will cause transient current and voltage fluctuations. On the one hand, it will adversely affect the stability of the mobile phone power supply, causing other devices to work abnormally; Current and voltage fluctuations will also have an impact on the electronic equipment on the mobile phone, which may reduce the working life of the electronic equipment on the mobile phone

In addition, according to the requirements of the patent literature of CN206181163U, it is necessary to add a power-on status signal to the processor for its DC power module, which will also require changes to the mobile phone circuit and mobile phone processor hardware, which increases the transformation cost and technical risk.

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