Privacy supporters have been less optimistic about augmented reality devices such as Google glasses . However, a group of researchers believe that , By using a new type of simple encrypted communication , Sub era glasses can eliminate the harassment of screen peepers , Let sensitive data appear in front of the receiver's eyes , Not just on the insecure computer screen , Provide new privacy .
University of North Carolina （University of North Carolina,UNC） A pilot system has been developed by researchers in the United States , They call it “ Visual code ”. The system can transmit encrypted information to the wearer's augmented reality glasses . In the systems they create and test , Encrypted information looks like a black-and-white still image created randomly . However, when the user's augmented reality glasses The image displayed When the displayed image is superimposed on each other , The two can be combined , Become a piece of readable information .
In a visual cryptography system developed by researchers at the University of North Carolina , The image on the far left below can be displayed on an augmented reality glasses , It overlays the image in the middle, and then it produces the rightmost image , It turns out that the letters H.
simply , The system allows people to use new ways to interpret ciphertext , Without the threat of peeping when text is displayed on the monitor . such as , It can be used to transmit ATM Random number pad on the machine , In this way, no one from behind can know the user's PIN code . Sarah from the University of North Carolina · rabbi （Sarah Andrabi） Explanation ,“ When you cover the ciphertext “ Visual sharing ” when , Only you can see the final news ”. The technical terms she uses “ Visual sharing ” It means two separate images that make up the final message .“ The ciphertext can now only be read by the user's eyes ”.
Researchers held a conference on available privacy and security last month （Symposium on Usable Privacy and Security） There's a show on . They first let Subjects Subjects decrypted two overlay images written in Braille , One of the displays is on the computer monitor , The other is Google glasses . However, the researchers found that there are too many limitations in the small lenses of Google glasses , So turn to Epson Moverio： This is another kind of augmented reality glasses based on Android , Both eyes have bigger lenses .
One subject wore Epson in an experimental test at the University of North Carolina Moverio
after , They showed the subjects a series of pictures that looked like black and white dots , And ask them to pass Moverio Glasses decipher these images . There is a slight suspicion of cheating in this process , Because they make people put their heads in a stable frame . When the glasses cover another black and white dot image , Two unrelated images make up a number or letter , The subjects were able to read the combined ciphertext letters .
Augmented reality encrypted communication system can be used , However, its speed needs to be improved ：30 Of the subjects ,26 A bit can be 100% Read each letter correctly , in addition 4 People achieve 80% The accuracy of , But the average time for the subjects to read the letters was 8.9 second . This may make the visual cryptography system only stay at the level of theoretical research , But it can't be a practical system that can be put into use immediately .
Researchers believe that the system can eventually solve a problem that has always plagued encryption technology ： The computer in charge of decryption may be hacked , Or stolen by a viewer . They think that , Through the visual encryption system , The decryption process uses only human eyes and brain , Plaintext messages don't appear on computers that are vulnerable to intrusion . Even the augmented reality glasses themselves don't have to be believable , The wearer of the glasses can see the final decrypted information , But augmented reality devices can only see obscure images . Rabbi says ,“ Even if the device you're using has been compromised , It doesn't expose anything , Because it's not a device that decrypts for you ”.
The researchers admit that , There are serious exceptions to the claim that glasses don't need to be trusted devices . First , All front cameras for augmented reality glasses must be disabled or covered , Otherwise it can see everything that users see , And can restore the same secret message . And then there's the problem of how to store superimposed images on the device , The image is essentially a secret key . If the device is connected to the Internet , Or they are sent to the device over a non secure connection channel , Then it is possible to be intercepted by the viewer , And used to decrypt the user's ciphertext . Matthew, Professor of computer science at Johns Hopkins University • green （Matthew Green） Express ,“ There are still many problems . If the viewer gets the ciphertext displayed on the terminal and glasses at the same time , They will be able to decipher the information and win .”
however , Rabbi at the University of North Carolina thinks , With augmented reality hardware becoming mainstream , Privacy advocates should look beyond Glasshole The problem of surveillance goes further . Take Microsoft as an example HoloLens For example , People should think about the possibility of building a new security system through this new human-computer interaction interface .“ On the one hand, augmented reality technology brings challenges to privacy , On the other hand, it also brings opportunities to explore new technologies .”