Security+ Chapter 5

The art of secret writing that enables an individual to hide the contents of a message from all but the intended recipient is called - Steganography - Cryptanalysis - Cryptography - Key management

A corporate spy copies proprietary information into a text file and then hides the text file in an image file. The image file is then posted on the company's web site for others who know where to look to extract the information. This is the example of the use of - Social engineering - Steganography - Cryptography - Cryptanalysis

Agents intercept a message that is encrypted. They use various techniques to try and decipher the plain text message. This is an example of - Desteganographying - Decrypting - Uncrypting - Cryptanalysis

The ROT13 cipher is an example of a - Shift cipher - Substitution cipher - Transposition cipher - Vigenère cipher

The Vigenère cipher works as a - Asymmetric encryption cipher - Transposition and substitution cipher - Polyalphabetic transposition cipher - Polyalphabetic substitution cipher

The cipher that replaces each letter of the alphabet with a different letter (not in sequence) is a - Shift cipher - Substitution cipher - Transposition cipher - Vigenère ciphe

Encrypting a message by simply rearranging the order of the letters is a function of the - Shift cipher - Substitution cipher - Transposition cipher - Vigenère cipher

Keyspace refers to - The location where keys are stored - The number of keys needed to encrypt or decrypt a message - All possible key values - The portion of the algorithm that the key connects with to encrypt or decrypt a message

An attacker is able to decrypt a message by finding a key that was not securely stored and should have been revoked. The is the result of - Poor key management - A weak key - A weak algorithm - A small keyspace

A special mathematical function that performs one-way encryption is called - Asymmetric encryption - Transposition cipher - Hashing function - Multiple encryption

Hashing algorithms can be compromised - By a collision attack - By reverse engineering the hash - With a differential cryptanalysis - With a linear cryptanalysis

Which of the following is NOT a hashing algorithm - SHA1 - MD2 - SHA3 - MD5

The encryption method based on the idea of using a shared key for encryption and decryption of data is - Hashing function - Symmetric encryption - Asymmetric encryption - Elliptical curve encryption

The encryption method base on the idea of two keys, one that is public and one that is private is - Hashing function - Symmetric encryption - Asymmetric encryption - Elliptical curve encryption

All of the following are asymmetric encryption algorithms EXCEPT: - RSA - 3DES - ECC - ElGamal

All of the following are symmetric encryption algorithms EXCEPT: - ECC - Blowfish - AES - DES

Cryptographic algorithms are used for all of the following EXCEPT: - Confidentiality - Integrity - Availability - Authentication

Keeping a copy of an encryption key with a trusted third party is known as - CYA - Key escrow - Key redundancy - Key management

What application of encryption verifies that a document was sent by the person it says it is from? - Digital rights management - Asymmetric encryption - Cryptographic hash - Digital signatures

When a message sent by a user is digitally signed with a private key, the person will not be able to deny sending the message. This application of encryption is an example of - Authentication - Nonrepudiation - Confidentiality - Auditing

Alice sends an e-mail that she encrypts with a shared key, which only she and Bob have. Upon receipt Bob decrypts the email and reads it. This application of encryption is an example of - Confidentiality - Integrity - Authentication - Nonrepudiation

Alice sends Bob a message along with an MD5 hash of the message. Upon receipt, Bob runs the MD5 hashing algorithm and finds that the hash matches the one sent by Alice. This application of encryption is an example of - Authentication - Nonrepudiation - Integrity - Confidentiality

Bob connects to a company web site. His browser indicates that the digital certificate of the web site is valid. This application of encryption is an example of - Authentication - Nonrepudiation - Integrity - Confidentiality

The process for protecting intellectual property from unauthorized used is called - Key escrow - Anti-pirating management - Digital signatures - Digital rights management

All of the following are cryptographic applications EXCEPT: - PGP - FreeOTFE - StegDetect - GnuPG

Cryptography is the process of attempting to return an encrypted message to its original form. True or False

Decryption is the process of creating ciphertext from plaintext. True or False

The Vigenère cipher is a polyalphabetic substitution cipher. True or False

Hashing functions are special mathematical functions that performs a two-way encryption. True or False

A collision attack is type of denial-of-service flooding attack that causes the number of collisions on the network to increase and thus bring down the network. True or False

The benefit of SHA-1 over MD5 is that it is resistant to a collision attack. True or False

DES, AES, RSA, and ECC are all examples of symmetric encryption. True or False

Cryptography can be used to protect confidentiality and integrity as well be used to implement nonrepudiation, authentication, key escrow, digital signatures, and digital rights management. True or False

The strength of a symmetric encryption is based on the secrecy of the algorithm, but the key can be public. True or False

Hiding a text file in a jpg file is an example of steganography. True or False