The academics described their technique in a recently published research paper, together with another attack method named voice masquerading.
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Currently, developers are stuck with Alexa's standard voice for any skill they want to make, but that's all about to change.
The first of these attacks is called "voice squatting" and relies on similarities between the voice commands that trigger specific actions.
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Polly's voices are far from flawless, of course, but as they see more use, that could change. To enable this, One can head over to the "Assist" settings on their Android phone and select Alexa as their default Assist app. English speaking voices into their skills.
Amazon announced a developer preview for adding eight Amazon Polly voices to Alexa skills. Additionally, you can leverage Amazon Polly's API to deliver automated real-time information such as service status, account and billing inquiries, addresses, and contact information.
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Academics say voice masquerading attacks are ideal for phishing users and have recorded two demos to prove their point. Regardless of their quality, though, many users will likely appreciate the added diversity these voices could add to their favorite Alexa skills in the future. Now it looks like Amazon is doing something similar to what Google has done, except that they're taking it a step further.