So now it's time for a quiz to see if you understand the differences between
CBC mode and Counter mode.
So the question is: If Alice wants to quickly encrypt a large file
and she's got a multi-core machine, or she's got access to a large distributed
computing resource, which of these two modes will allow her to encrypt the file
more quickly? The choices are that it doesn't matter--that CBC mode would
be faster or that CTR mode would be faster.
