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Exam 8: Cryptography

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Question 1

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__________ is the entire range of values that can possibly be used to construct an individual key.

A) Code
B) Keyspace
C) An algorithm
D) A cryptogram

E) A) and C)
F) B) and D)

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Question 2

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Popular cryptosystems use a hybrid combination of symmetric and asymmetric algorithms.

A) True
B) False

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Question 3

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The most common hybrid system is based on the Diffie-Hellman key exchange, which is a method for exchanging private keys using public-key encryption.

An X.509 v3 certificate binds a ___________, which uniquely identifies a certificate entity, to a user's public key.

Hash algorithms are public functions that create a message digest by converting variable-length messages into a single fixed-length value. _________________________

To perform the Caesar cipher encryption operation, the pad values are added to numeric values that represent the plaintext that needs to be encrypted.

__________ is a protocol that can be used to secure communications across any IP-based network such as LANs, WANs, and the Internet.

As DES became known as being too weak for highly classified communications, Double DES was created to provide a level of security far beyond that of DES. _________________________

Hashing functions require the use of keys.

Secure Electronic Transactions was developed by MasterCard and Visa in 1997 to protect against electronic payment fraud.

The S-HTTP security solution provides six services: authentication by digital signatures, message encryption, compression, e-mail compatibility, segmentation, and key management.

UltraViolet wireless (UVW) is a de facto industry standard for short-range wireless communications between devices. _________________________

Usually, as the length of a cryptovariable increases, the number of random guesses that have to be made in order to break the code is reduced.

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

Describe digital certificates.

Asymmetric encryption systems use a single key to both encrypt and decrypt a message.

_________ is a hybrid cryptosystem that combines some of the best available cryptographic algorithms and has become the open-source de facto standard for encryption and authentication of e-mail and file storage applications.

In IPSec ____________________ mode, only the IP data is encrypted, not the IP headers.

__________ is the amount of effort (usually in hours) required to perform cryptanalysis to decode an encrypted message when the key or algorithm (or both) are unknown.

A mathematical ____________________ is a secret mechanism that enables you to easily accomplish the reverse function in a one-way function.