1.

A.

A larger key space makes a cipher ________ secure against _______ attack.

more, any

more, a brute-force

less, any

less, a side-channel

B.

Modular arithmetic, used in cryptography, is part of number theory, which _________________ has been seen as a branch of mathematics ______________________ applications.

historically, without any

historically, with specific

recently, without any

recently, with unlimited

C.

The security of a stream cipher depends on _________________________.

the random generation of keys

a changing initialization vector

all of these

the synchronization of the keystreams