What is the idea of mobile phone security encryption?

A secure encrypted mobile phone doesn't mean an ordinary mobile phone plus a protection software, "Hisense staff said. They will soon launch a secure encrypted mobile phone. If a specific example is used, the protection software on the market can only be classified after it is received. This is a remedy; Before the collection process, special security encrypted mobile phones have been identified and eliminated. "

Cool S6, this mobile phone is also the encrypted mobile phone selected by Shanghai civil service system. From the appearance, this mobile phone is no different from ordinary smart phones. The staff told reporters that this phone only displays encryption function when making a call. Every time I make a phone call, there is a red encryption key on the screen in addition to the green dialing key that ordinary mobile phones have. Click it to enter encrypted call mode. When there is an encrypted call, a red prompt button with the word "encrypted" will pop up on the screen of the mobile phone. Click it to enter encrypted call mode. "If you feel that the content of the call is sensitive during the ordinary call, you can also switch to the encryption mode, which will be transferred after about 1 second."

Xiang Ligang, a communication expert, said in an interview with the media that encrypted mobile phones can be divided into two situations. The first one is that phone books, short messages and pictures can be read by others in an encrypted way. The second case is that two encrypted mobile phones communicate securely. "For example, if you call me, your voice comes from voice packets. This is a commonly used technology, and others can monitor and obtain this information in real time. But if it is encrypted, your voice will become an encrypted voice packet. Come to my side. Then my mobile phone is also an encrypted mobile phone, and I want to solve it through the key, so although we both say that we seem to be on the phone, talking and listening clearly, but