| abstract |
A method of storing multiple first bit-patterns in non-volatile memory of a device, the method comprising, for each of the first bit-patterns to be stored: (a) applying a one way function to a third bit-pattern based on a second bit-pattern associated with the device, thereby to generate a first result; (b) applying a second function to the first result and the first bit-pattern, thereby to generate a second result; and (c) storing the second result in the memory, thereby indirectly storing the first bit-pattern; wherein the third bit-patterns used for the respective first bit-patterns are relatively unique compared to each other. |