Page 251 - CISSO_Prep_ Guide

CRYPTOGRAPHY

Terms
• Cryptogram: ciphertext.
• Cryptanalysis: defeating cryptology.
• Keyspace: number of distinct keys.
• Key clustering: Uneven distribution of key
use across keyspace.
• Key collision: Two different users of the
same key OR two different keys that will:
• Generate the same ciphertext.
• Decrypt a single ciphertext.
• Work factor: the amount of time to
overcome a protective measure, measured in
a million instructors per second (MIPS).
• Link encryption: Creates a new header,
hides the source/destination address, and
provides traffic flow confidentiality.
• End-to-end encryption: you lose traffic flow
confidentiality. Used with Key Distribution
Center (KDC).
• Scytale-Sparta: 400 B.C. method of
encrypting using a rod.
• Caesar Cipher: rotational cipher of 3
characters
• Alberti's Disk: rotation using disks.
• Kerchkhoff principle: the strength of your
encryption should not rely on keeping your