A security researcher is warning WhatsApp users that their chats can be retrieved even after they have been deleted, cleared, or archived. Jonathan Zdziarski says that even using the 'Clear All Chats' option leaves behind a 'forensic trace'. He warns that the only way to be certain that your chat history is deleted, is to get rid of the app entirely. The problem appears to stem from WhatsApp's use of SQLite which fails to overwrite deleted data by default, rendering it recoverable. As with deleted files on a hard drive, the SQLite database is simply updated to show that the… [Continue Reading]