Looks like iOS 7 Beta 4 just conclusively outed the fact that Apple is planning on putting a fingerprint sensor underneath the home button of the iPhone 5S: strings found in iOS 7 Beta 4’s BiometricKitUI.axbundle make reference to an iOS 7 tutorial which will reference a “photo of a person holding an iPhone with their right hand while touching the Home button with their thumb” and “a fingerprint that changes colour during the setup process.”

When a user of an iPhone 5S is setting up their iPhone to recognize their fingerprint, they will get a message saying that “Recogition is X% complete”, where X% is presumably a progress bar filling in.

Hamza Sood has found a lot of hidden iOS settings in the past, so he’s got a good track record. This looks pretty legit, and we all knew Apple acquired Authentec for a reason, and that fingerprint sensors were coming to iOS devices. This is our first peek, though, at how they will be realized, with typical Apple simplicity.

Source: @hamzasood