__________, in the context of passwords, refers to an adversary’s attempt to learn the
password by observing the user, finding a written copy of the password, or some similar
attack that involves the physical proximity of user and adversary.
The assets of a computer system can be categorized as hardware, software,
communication lines and networks, and _________.
A hash function such as SHA-1 was not designed for use as a MAC and cannot be used
directly for that purpose because it does not rely on a secret key.
The two criteria used to validate that a sequence of numbers is random are
independence and _________ .