The GSMA has been claiming that an A5/1 Rainbow Table will need the equivalent of a tower of books 20km high, which is about as useful as saying that such a table couldn’t be written on a fish.
The Register on GSM security
The GSMA has been claiming that an A5/1 Rainbow Table will need the equivalent of a tower of books 20km high, which is about as useful as saying that such a table couldn’t be written on a fish.