For example, if the user elects to use a 16 character complex passcode using upper and lower case letters mixed with numbers and symbols, that passcode would be then entangled with the 128 character UUID of the device to construct a 144 character key. The number of possible keys is 144^223. Either I'm on crack, or they came up with some new permutation math, or that's supposed to be 223^144. ;)