No mo Jane Doe.
Just in case you happen to leave your fingerprints at home, Xvista uses your iris as a physical world hyperlink for identification.
Remember a fingerprint and an iris are just a couple examples of a physical world hyperlink
From GizModo Xvista Portable Iris Scanner
Xvista has been hard at work improving iris scanning technology, having just developed the UK's first portable iris scanner.
Small enough to be fitted inside a cellphone, xvista's technology could conceivably be integrated into heavily trafficked areas, such as airports.
The iris data is captured and processed by a unique algorithm designed specifically to operate on low power computing devices such as a camera equipped mobile phone
Since iris scanning technology is quite accurate, with the odds of two irises matching being less than 1 in 7 billion, expect to see this technology make more inroads as time marches on.
The iris is a machine readabale identifier.