Almost every time, some mysterious message "code" will appear on iOS, and sending relevant text will cause the system or chat app to crash. I still remember that it appeared on WeChat last year, sending "15 periods" to cause the BUG of some brands of mobile phones to die.
Many of these are related to the text renderer of the system or program. Some foreign users have found that Android phones are also recruited.
Simply put, the "black dot" expression shown in the figure, there is no problem sending and receiving, but when you click on it, it will cause the current program to crash and crash, the foreign feedback is mainly Whatsapp.
Tom Scott analyzed and found that this is another Unicode trick. Unicode is an international standard for transferring text between computers, containing tens of thousands of characters and supporting N languages.
However, there are also invisible characters in Unicode, such as defining the width, defining the code from left to right (from right to left, Arabic/Hebrew use), defining conjunctions, and defining high and low frequencies. The "trick" of this black dot is that after using OBJ encoding, we found that there is actually a long string of characters after the black dot we saw. The fabricator uses a character with a width of 0 and a left-right order to hide it.
When you click, the Android text renderer needs to determine which one you clicked. This process has a bug and causes the program to crash.
The "black dot" expression that caused the Android phone information APP to be stuck in seconds was confirmed to be equally effective for iOS.
On iOS 11.4 Beta 4, 11.3.1, 11.3 or any iOS 11/10 device, once you click on this expression in an information application (such as SMS, iMessage), the app will be stuck immediately.
In iPhone X, even if you turn off the information from the background and re-enter or even restart the phone, you can't solve it. What you can do is to use the 3D Touch to call out the new information, then return to the message interface and delete the stream with the expression.
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