Ch. 9 Assessment

Which of the following is one of the four basic forms of a cryptographic attack?

A. Ciphertext-only attack B. Known-plaintext attack C. Chosen-plaintext attack D. Chosen-ciphertext attack

Which information security objective allows trusted entities to endorse information?

Certification

A __________ signature is a representation of a physical signature stored in a digital format.

Digitized

The act of scrambling plaintext into ciphertext is known as __________.

Encryption

Product cipher is an encryption algorithm that has no corresponding decryption algorithm.

False

A __________ is used to detect forgeries.

Hash function

__________ corroborates the identity of an entity, whether the sender, the sender's computer, some device, or some information.

Nonrepudiation

A strong hash function is designed so that a forged message cannot result in the same hash as a legitimate message.

True

A substitution cipher replaces bits, characters, or blocks of information with other bits, characters, or blocks.

True

Encryption ciphers fall into two general categories: symmetric (private) key and asymmetric (public) key.

True

The two basic types of ciphers are transposition and substitution.

True

An algorithm used for cryptographic purposes is known as a __________.

Cipher

__________ offers a mechanism to accomplish four security goals: confidentiality, integrity, authentication, and nonrepudiation.

Cryptography

An encryption cipher that uses the same key to encrypt and decrypt is called a(n) __________ key.

Symmetric (private)

DES, IDEA, RC4, and WEP are examples of __________.

Symmetric algorithms (or standards)DES, IDEA, RC4, and WEP are examples of __________.

A salt value is a set of random characters you can combine with an actual input key to create the encryption key.

True