The concept of two keys, public and private, is called ____ cryptography.

____ encryption is also called symmetric key encryption.

The __________ polyalphabetic cypher uses 26 alphabets.

A __________ is a system that protects the computer network from unauthorized access.

A ________ sends data between two networks.

A ________ network can contain servers as well as individual computers

Cryptography, a word with Greek origins, means

The Acronym DES stands for

The substitutional ciphers are

The shift cipher is sometimes referred to as the

An asymmetric-key cipher uses