QUESTION: 109

Protocol suite provides a method of setting up a secure channel for protected data exchange between two devices.

CLR
OCSP
TLS
IPSec

Answer(s): D

Explanation:

IPSec https://en.wikipedia.org/wiki/IPsec
Internet Protocol Security (IPsec) is a secure network protocol suite that authenticates and encrypts the packets of data to provide secure encrypted communication between two computers over an Internet Protocol network. It is used in virtual private networks (VPNs).

Incorrect answers:
OCSP - Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining the revocation status of an X.509 digital certificate.
CRL - is a list of digital certificates that have been revoked by the issuing certificate authority (CA) before their scheduled expiration date and should no longer be trusted.
TLS - Transport Layer Security, and its now-deprecated predecessor, Secure Sockets Layer (SSL), are cryptographic protocols designed to provide communications security over a computer network. Several versions of the protocols find widespread use in applications such as web browsing, email, instant messaging, and voice over IP (VoIP). Websites can use TLS to secure all communications between their servers and web browsers.

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QUESTION: 110

What type of encryption uses different keys to encrypt and decrypt the message?

Asymmetric
Symmetric
Secure
Private key

Answer(s): A

Explanation:

Asymmetric
https://en.wikipedia.org/wiki/Public-key_cryptography
Asymmetric cryptography, is a cryptographic system that uses pairs of keys: public keys, which may be disseminated widely, and private keys, which are known only to the owner. The generation of such keys depends on cryptographic algorithms based on mathematical problems to produce one- way functions. Effective security only requires keeping the private key private; the public key can be openly distributed without compromising security.

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QUESTION: 111

With Electronic codebook (ECB) what happens:

The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
The cipher text from the current round is XORed with the plaintext from the previous round
The block cipher is turned into a stream cipher
The cipher text from the current round is XORed with the plaintext for the next round

Answer(s): A

Explanation:

The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_codebook_(ECB)
The simplest of the encryption modes is the electronic codebook (ECB) mode (named after conventional physical codebooks). The message is divided into blocks, and each block is encrypted separately.

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QUESTION: 112

A disk you rotated to encrypt/decrypt. Created by Leon Alberti. Similar technologies were used in the Enigma machine. Considered the forefather of modern encryption.

Chi Square
Enigma Machine
Cipher Disks
Scytale Cipher

Answer(s): C

Explanation:

Cipher disks https://en.wikipedia.org/wiki/Cipher_disk
A cipher disk is an enciphering and deciphering tool developed in 1470 by the Italian architect and author Leon Battista Alberti. He constructed a device, (eponymously called the Alberti cipher disk) consisting of two concentric circular plates mounted one on top of the other. The larger plate is called the "stationary" and the smaller one the "moveable" since the smaller one could move on top of the "stationary".

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QUESTION: 109

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QUESTION: 111

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QUESTION: 112

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