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In 1917, Gilbert S. Vernam, an AT&T employee, invented a polyalphabetic cipher machine that used a non-repeating random key.

One encryption method made popular by spy movies involves using the text in a book as the key to decrypt a message.

PKI systems are based on public key cryptosystems and include digital certificates and certificate authorities.

Bit stream methods most commonly use functions like _____.

The encapsulating security payload protocol provides secrecy for the contents of network communications as well as system-to-system authentication and data integrity verification.

As frustrating as viruses and worms are, perhaps more time and money is spent on resolving ____.

Acts of ____ can lead to unauthorized real or virtual actions that enable information gatherers to enter premises or systems they have not been authorized to enter.

A(n) ____ is an attack in which a coordinated stream of requests is launched against a target from many locations at the same time.

Which of the following is an example of a Trojan horse program?

Compared to Web site defacement, vandalism from within a network is less malicious in intent and more public.