I am studying a cryptography video on Coursera here titled: Modes of Operation: Many Time Key (CTR).
I have just two simple questions:
At around 4:30 in the video they show 2^48 without saying where this number came from, perhaps it forms part of the AES specification?
They then go on to explain that they plugged in the value 2^48 into the underlined equation on the line above, to calculate how many messages and of what size could be sent before a new key is required. How did they do this and what was the output?