While Apple fans have long awaited this big update, so has another group: the biometrics industry. Sensor companies have been wishing for a major player to swoop in, show how far the technology has advanced, and persuade shoppers that biometrics can be cool.
"Many think that the iPhone 5S is a tipping point for consumers," says Adam Vrankulj, editor of the industry news outlet Biometric Update. After Apple purchased fingerprint-sensor company AuthenTec for $350 million in 2012, the stock price of several similar firms more than doubled.
Fingerprint sensors have come a long way since 2002, when researchers found a way to trick high-end scanners with fake gelatin fingers. Today's technology not only reads the tiny ridge patterns, but some can also look at blood flow and vein patterns underneath the skin.
Plus, we now know that fingerprints and irises are not people's only unique features. Scientists have devised ways to identify humans by the shape of their ears, kneecaps, and even their bottoms. A team at the Advanced Institute of Industrial Technology in Tokyo designed its rump sensor as an antitheft measure for cars. The group claims that these prototype seats can recognize the owner's posterior with 98 percent accuracy.
Canadian firm Bionym listens to people's heart rhythms. While a human heart pounds at different tempos throughout the day, each person has a unique overall pattern, one based on the size and position of the heart within the body. The company's Nymi bracelet uses electrocardiogram technology to read this heart rhythm and confirm the wearer's identity.
Of course, biometric scanners are still far from perfect. The iPhone reportedly stumbles when it comes to wet or sweaty fingers. Mr. Vrankulj says the facial recognition software in his Android phone has a hard time with glasses and his newly grown beard – not to mention the false positives from simply holding up an image of the owner's face.
Some have also voiced concerns about government agencies demanding the fingerprints of certain customers. Apple says such seizures would be impossible. The encrypted data stays locked up within the device, not on any of Apple's servers.
For more on how technology intersects daily life, follow Chris on Twitter @venturenaut.
The original version of this article ran in the September 30 issue of the Christian Science Monitor magazine.