You might assume that as long as your apps encrypt their content, no one can tell what you're doing. But there’s a hidden side-channel at work: app fingerprinting. Even when the words you send are private, the way your app communicates often betrays…
 
                  
                  
                
 
                  
                   
                  
                   
                  
                   
                  
                   
                  
                   
                  
                   
                  
                   
                  
                  