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Voice assistants vulnerable to silent voice control attack. Voice assistants, including Apple's Siri and Amazon's Alexa, can be controlled by hackers using inaudible voice commands, researchers at Zhejiang University in China have found.

This can be done using a technique that translates voice commands into ultrasonic frequencies that are too high for the human ear to recognise. The technique, named Dolphin. Attack, could be used to download a virus, send fake messages and even add fake events to a calendar. It could also give hackers access to outgoing video or phone calls, allowing them to spy on their victims.  Scroll down for video The fault is due to vulnerabilities in the software and hardware of speech recognition systems. Dolphin. Attack manipulates the microphones inside the devices, including the Apple Watch 2 (pictured left) and Amazon Echo Dot (pictured right) in order to understand the high- frequency commands. DOLPHINATTACK'Dolphin. Attack' uses frequencies above 2.

Hz to control voice assistants. This is higher than the range of human hearing, so the commands are silent. Voice assistance devices are able to hear the inaudible commands. Commands are translated using microphones on targeted devices. Attack range is between 5ft and 6ft.

Research demonstrates faults in the hardware and software of speech recognition devices. Voice assistant apps across almost every platform are at risk of being controlled, the study found. While the commands may go unheard by humans, the low- frequency audio commands can be picked up, recovered and then interpreted by speech recognition systems. Always- on voice assistants, such as Alexa, are extremely vulnerable to cyber attacks.

In total, the new study identifies 1. Dolphin. Attack'. Researchers tested Apple i.

Phone models from i. Phone 4s to i. Phone 7 Plus, Apple watch, Apple i. Pad mini 4, Apple Mac. Book, LG Nexus 5. X, Asus Nexus 7, Samsung Galaxy S6 edge, Huawei Honor 7, Lenovo Think.

Pad T4. 40p, Amazon Echo and Audi Q3. The team were able to launch attacks, which are higher than 2. Hz, by using less than £2. Galaxy S6 Edge. They used an external battery, an amplifier, and an ultrasonic transducer. Watch Immigration Tango Streaming on this page.

This allowed them to send sounds which the voice assistants' microphones were able to pick up and understand. Dolphin. Attack uses frequencies out of the human range of hearing in order to manipulate voice assistant software and the hardware that uses it to doing a range of tasks. AFFECTED SPEECH RECOGNITION SYSTEMS AND DEVICESManufacturer. Model. System. Applei. Phone 4s. Siri. Applei.

Phone 5s. Siri. Applei. Phone SESiri/Chrome. Applei. Phone 6s. Siri. Applei. Phone 6 Plus.

Siri. Applei. Phone 7 Plus Siri. Applewatch. Siri. Applei. Pad mini 4. Siri. Apple. Mac. Book. Siri. LGNexus 5. XGoogle Now. Asus. Nexus 7. Google Now.

Samsung. Galaxy S6 Edge. S Voice. Huawei. Honor 7. Hi. Voice. Lenovo. Think. Pad T4. 40p. Cortana. Amazon. Echo.

Alexa. Audi. Q3. N/ASource:  Zhejiang University  At the moment, the attack has a limited range of 5. Using the attack, hackers can carry out tasks including ordering Siri to start a Face. Time call or starting Google Now to switch a phone on to airplane mode. Attackers can also order an Audi Q3 to drive to a new location by changing its navigational system settings. They can even make a Macbook or Nexus 7 open a dangerous website or ask Amazon Echo to open the backdoor, according to fastcodesign. Using a smartphone and additional hardware to the value of £2. Popular voice assistant devices including Siri (pictured), Google Now, Samsung S Voice, Huawei Hi.

Voice, Cortana and Alexa are all susceptible to silent attacks, researchers in China revealed. The inaudible voice commands were correctly interpreted by the speech recognition systems on all the tested hardware. Researchers say the fault is due to both software and hardware issues. The microphones and software that runs assistants such as Alexa and Google Now can pick up frequencies above 2.

Khz, which is the limit of the audible range for human ears. Now the technique is in the public domain, devices across Apple and Android, including the Samsung Galaxy S6 Edge (pictured left) and i. Phone 6. S (pictured right) can be attacked by hackers with the technical knowledge to carry out 'Dolphin. Attack'The technique can also be used to hack navigational software, so your car could be rerouted to a different destination. Pictured left is a Macbook, and right is the Audi 0. In their study, published in Arxiv, the researchers, led by Guoming Zhang, wrote: 'We validate Dolphin.

Attack on popular speech recognition systems, including Siri, Google Now, Samsung S Voice, Huawei Hi. Voice, Cortana and Alexa.'By injecting a sequence of inaudible voice commands, we show a few proof- of- concept attacks, which include activating Siri to initiate a Face. Time call on i. Phone, activating Google Now to switch the phone to the airplane mode, and even manipulating the navigation system in an Audi automobile. 'We propose hardware and software defense solutions. 'We validate that it is feasible to detect Dolphin. Attack by classifying the audios using supported vector machine (SVM), and suggest to re- design voice controllable systems to be resilient to inaudible voice command attacks.'.