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Apple exec Craig Federighi added an unwanted blot on his public CV when his iPhone X demo hit a rocky patch and duly sent Apple's share price into a tailspin.

Still, Face ID's failure prompted widespread backlash against the company, with many potential Apple customers deciding against investing their hard-earned money into the company's latest device. When users unlock an iPhone using the fingerprint sensor, the numerical representations stored in the Secure Enclave is matched with the fingerprint given by the user in order to unlock the device. Instead it uses a new kind of facial recognition technology Apple calls Face ID to unlock the phone.

iPhone X will be available in silver and space gray in 64GB and 256GB models starting at US$999.

Franken also asked if the camera associated with Face ID will always be on, and how Apple will deal with law enforcement requests for Face ID data.

There was also the possibility that someone other than Federighi tried scanning his or her face on the iPhone X and failed, causing the passcode screen to pop up.

Calling for transparency from Apple, Senator Franken seeks reassurance that the locally stored Face ID data can not be extracted from an iPhone X either by Apple or a third party, remotely or locally.

"As a result, should a bad actor gain access to the face print data that Face ID requires, the ramifications could last forever, particularly if Apple's biometric technology comes to be used in other devices and settings", he said in the letter.

Regardless of the onstage mishap, Face ID will still face plenty of questions going forward. "After failing a number of times, because they weren't Craig, the iPhone did what it was created to do, which was to require his passcode".

He also wants to know whether the Face ID will recognize different genders, races, and ages. But the iPhone X's security system worked perfectly if we are to believe Apple's statement.

Apple has confirmed that while its TouchID fingerprint authentication system is disabled after five failed attempts, Face ID is disabled after just two unsuccessful attempts, the report says. Face ID projects more than 30,000 invisible IR dots.

In fact, there are many situations when the Face ID won't be a reliable option to unlock the phone.