In short, standard key-derivation function, PBKDF2, is used in a very strange way, to say the least. Where Apple has used 2,000 iterations in iOS 3.x, and 10,000 iterations in iOS 4.x, BlackBerry uses only one. Another significant shortcoming is that it's BlackBerry Desktop Software that encrypts data, not the BlackBerry device itself. This means that the data is passed from the device to the computer in a plain, unencrypted form. Apple devices act differently; the data is encrypted on the device and never leaves it in an unencrypted form