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On the Internet, things are almost never truly destroyed or forgotten, even if we use Snapchat. Most any time a user communicates digitally, "artifacts are going to be left behind," London told Mashable. Although they are experts, and the phones they examined are jailbroken and rooted, they said they don't think it would be too difficult for a non-expert to retrieve this data. The two confirmed research published in May by another firm, Decipher Forensics: On Snapchat for Android, images can be saved to the phone while they remain unopened. London and O'Meara found they can retrieve other types of information, however, which can be almost as revealing as the picture itself. Analyzing an iPhone 4 running iOS 5 and 6, they found that Snapchat creates a file called "user.plist," which contains all sorts of metadata on images received and sent. On two Samsungs — a Galaxy S3 and a rooted S3 Mini — they found an .XML file containing the same information.

The only app the two were not able to penetrate was Wickr, a sort of Snapchat for adults that Mashable profiled in April. One of the founders of Wickr, Nico Sell, who is also one of the organizers of Def Con, was at the presentation. Even though pictures are somewhat safe, London and O'Meara told Mashable they didn't do any memory analysis to see if the data was still retrievable through more sophisticated techniques, something they plan on doing in the next few weeks. But how much information do applications like Snapchat, Facebook Poke and Wickr actually leave behind? Also, the app will only permanently delete a series of images after the last one has been viewed. The data includes the time the photos were sent and received, as well as the identity of the sender and receiver. Even though images sent through the service were not recoverable, the text included in the Pokes was stored in a database file.

The two found that the app, which claims on its very logo to "leave no trace," seems to keep its promise, leaving behind no metadata. Powered by its own proprietary technology, Mashable is the go-to source for tech, digital culture and entertainment content for its dedicated and influential audience around the globe.
Andrea London and Kyle O'Meara, of forensics firm Stroz Friedberg, analyze phones and computers in search of digital evidence for law enforcement agencies and investigators.
The two studied how Snapchat, Facebook Poke and Wickr store data on iPhones and Android phones to see how much information the apps leave behind.

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