SamMobile reported illustrated images of fingerprints were found in an apk, or Android application package, file in the phone's file system, suggesting Samsung may have been testing the technology internally, Slash Gear reported Tuesday.
There have been rumors for some time Apple is considering bringing fingerprint scanning to iOS devices, and the company made deals with two security firms, including one involved in biometrics, last year.
The images in a leaked firmware build for the Galaxy S III are somewhat ambiguous, consisting of stylized fingerprint drawings, plus and check signs, and a graphic of a finger being pressed on a smartphone screen, Slash Gear reported.
However, the file containing the images is named SecSettings.apk, which strongly hints at Security Settings.
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