A UDID is a 40-character sequence of letters and numbers assigned to a piece of hardware, such as an iPhone or an iPad. Developers have used UDIDs for authentication and tracking purposes, but the practice is frowned upon as a potential privacy concern. In March, Apple stopped accepting iPhone and iPad applications for submission to the store that collect and share UDIDs.
Soltani analyzed Fly Delta using an application called MobileScope, that he and two other researchers, David Campbell and Aldo Cortesi, developed. MobileScope analyzes mobile applications to see what information the applications handle.
Delta could face a penalty of $2,500 for each time a non-compliant mobile application is downloaded, the attorney general's office said. The application has been downloaded millions of times from Google's Play and Apple's iTunes application markets, according to the lawsuit.
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