Apple’s Siri voice assistant on iOS devices retains information to help the company generate better and more accurate results in the analysis process that takes place at its remote servers. The company has never previously revealed exactly how long it keeps that data or how exactly it works, but now Wired has learned from an Apple spokesperson exactly how Siri IDs and store data, as well as for how long. Apple said that it first associates voice files gathered by Siri with a randomly generated number to keep all associated data anonymous, and separate from any other identifiers including your Apple ID or even your email address.