Dual-channel encryption editor tried to intercept Gionee special line call.

IT 168 Evaluation Gionee M6 and M6 Plus provide business people with super battery life and built-in mobile phone security encryption, providing all-round security for mobile phones. The special line calling function of Gionee M6/M6 Plus is a major feature. Based on the security encryption chip, the call is encrypted by hardware, and the call data and short messages are transmitted through the data network, which provides a mobile phone security call scheme with security beyond cellular network and various VoIP. Today, we will study in detail how Gionee's special line call function is realized. How safe is it?

▲ The editor tried to intercept Jinli's special line.

How to use the dedicated telephone?

Dedicated line call is a way of calling through hardware encryption chip. Every call (or short message) made (or sent) by a dedicated line phone will be encrypted by a hardware encryption security chip to prevent the call voice or short message from being maliciously intercepted and effectively prevent eavesdropping. Dedicated line calls are made through the data traffic of operators or WiFi networks. At present, only M6 and M6 Plus products can talk to each other or send short messages.

▲ Dedicated line telephone

"One word, one key" can be realized through private line call, that is, each private line call will generate a different key to ensure the privacy of private line call. Because the dialogue will produce 16 bits, 32 bits, 64 bits and other complex data packets, the packet grabbing behavior cannot be repeated, and the packet loss cannot be analyzed reversely to prevent "eavesdropping" or "data recovery after packet grabbing". The contents of calls and short messages are protected by hardware encryption, and the truncated packets cannot be deciphered, only garbled codes can be seen.

▲ Dedicated line telephone

Private line call is a point-to-point encrypted call based on data network, so the mobile phone can use wifi network without SIM card. When using a dedicated line, the interface will display "Current call is encrypted and protected". At this time, the content of the call is encrypted and cannot be eavesdropped. Even if the data of the call is intercepted, it is a bunch of garbled codes.

▲ Dedicated line call information transmission

Dedicated lines can not only make calls, but also send messages. At the same time, based on the data network, it has nothing to do with the mobile signal of the mobile phone. The short message content is also encrypted by hardware to ensure that the short message content is absolutely safe and will not be stolen.

How safe is the dedicated telephone?

Call data transmission based on data network

▲ Ordinary telephone and VoIP encryption methods.

The dedicated line calling function on Gionee M6/M6 Plus is based on data network, which can be used whether you use wifi network or mobile phone data network. That is to say, if your mobile phone is only connected to wifi network without inserting SIM card, Gionee's dedicated line calling function can still be used. This benefit can prevent eavesdropping on the conversation content of mobile phones based on cellular networks by copying SIM cards or other technical means.

Hardware encryption is not easy to crack.

▲ Jinli special line call encryption method

Secondly, Gionee M6/M6 Plus has a built-in mobile phone security encryption chip, and every call of users will be encrypted by hardware. Compared with ordinary software encryption, hardware encryption is much safer, more difficult to crack and takes a very long time. Here I want to say that voice calls based on cellular network, WeChat, QQ, etc. on mobile phones will be encrypted, and these encryption are all software encryption, which is easy to be cracked. Therefore, Gionee M6/M6 Plus's dedicated line call based on hardware encryption is more secure.

Data Interception: Dual Channel Encrypted Data Transmission

▲smsniff packet capture software

We set up a wifi hotspot with a computer, then connected two Gionee M6 to this hotspot, monitored the data in the entire wifi network with smsniff, and then analyzed the intercepted data to see the data flow when Gionee M6 used a dedicated line to talk.

▲ Jinli special line call data

We use network packet capture software to monitor the private line call between Gionee M6 and M6 Plus. 192.168.137.37 and192.168.137.48 These two IP addresses are two Gionee M6 mobile phones under the same LAN. It can be seen that when using a dedicated line, Let's take a look at the data during the WeChat call.

▲ WeChat call data

It can be seen that when using WeChat, there is only one data channel between the two Gionee M6 and the server, which is one less than when using the dedicated line. Two data channels mean that if you need to eavesdrop on the contents of the Gionee special line call, you must intercept the data of these two channels at the same time and decode the data of these two channels. It turns out that Gionee's private line call has been encrypted by hardware, and it is difficult to crack a single data channel. Now it is almost impossible to crack two data channels at the same time, so the special line calling function of Gionee M6/M6 Plus is very safe.

Summary:

The special line calling function of Gionee M6/M6 Plus is based on hardware encryption and two data transmission channels, which greatly increases the cracking difficulty and improves the call security. Compared with GSM cellular network and other VoIP calls, Gionee M6/M6 Plus has stronger anti-eavesdropping ability, but it also has some limitations. Gionee M6/M6 Plus must be used to realize the special line call function.