Chapter 13 Flashcards
cryptography
The practice and study of hiding information.
cipher
An algorithm that can perform encryption or decryption.
algorithms
Well-defi ned instructions that describe computations from their initial
state to their fi nal state.
asymmetric key algorithm
A type of cipher that uses a pair of different keys to encrypt
and decrypt data.
symmetric key algorithm
A class of cipher that uses identical or closely related keys for encryption and decryption.
stream cipher
A type of algorithm that encrypts each byte in a message one at a time.
block cipher
A type of algorithm that encrypts a number of bits as individual units
known as blocks.
public key cryptography
Uses asymmetric keys alone or in addition to symmetric keys.
steganography
The science (and art) of writing hidden messages; it is a form of security through obscurity.
Data Encryption Standard (DES)
An older type of block cipher selected by the United
States federal government back in the 1970s as its encryption standard; due to its weak
key, it is now considered deprecated.
data loss prevention (DLP) Systems that
Triple DES (3DES)
Similar to DES but applies the cipher algorithm three times to each
cipher block.
Advanced Encryption Standard (AES)
An encryption standard used with WPA and
WPA2.
The successor to DES/3DES.
RSA
A public key cryptography algorithm created by Rivest, Shamir, Adleman. It is
commonly used in e-commerce.
Diffie-Hellman key exchange
Invented in the 1970s, it was the fi rst practical method
for establishing a shared secret key over an unprotected communications channel.
elliptic curve cryptography (ECC)
A type of public key cryptography based on the
structure of an elliptic curve.
