I have not had any issues like this, but it makes sense. Even better would be the ability to differentiate between household members. No current assistant does this. Must be hard?
Voice-checking device stops hackers hijacking your Siri or Alexa By Matt Reynolds
Does your digital sistant know who it’s talking to? A wearable device prototype could let voice-controlled assistants like Apple’s Siri or Amazon’s Alexa recognise their owner so they don’t take orders from anyone else.
The VAuth device, developed at the University of Michigan in Ann Arbor, uses an accelerometer hidden in a pair of glasses or earphones or worn around the neck. The accelerometer measures vibrations created as the wearer speaks. An algorithm then compares those vibrations with the audio signal received by the digital assistant. If the vibrations and the audio match, then the voice command is received as normal. If not, the assistant is blocked from responding.
Computer scientists Huan Feng and Kassem Fawaz at the University of Michigan tested VAuth with 18 people saying 30 different commands. It was able to match speech vibrations with audio signals 97 per cent of the time, and did not act on commands issued by someone other than the device owner. Although they tested VAuth only with Android assistant Google Now, Feng and Fawaz are confident it could work with other voice assistants if their manufacturers allowed it. .... "