Security+ chapter 5
All of the following are asymmetric encryption algorithms EXCEPT: - RSA - 3DES - ECC - ElGamal
3DES
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
All possible key values
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
Asymmetric encryption
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
Authentication
Cryptographic algorithms are used for all of the following EXCEPT: - Confidentiality - Integrity - Availability - Authentication
Availability
Hashing algorithms can be compromised - By a collision attack - By reverse engineering the hash - With a differential cryptanalysis - With a linear cryptanalysis
By a collision attack
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
Confidentiality
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
Cryptanalysis
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
Cryptography
The process for protecting intellectual property from unauthorized used is called - Key escrow - Anti-pirating management - Digital signatures - Digital rights management
Digital rights 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
Digital signatures
All of the following are symmetric encryption algorithms EXCEPT: - ECC - Blowfish - AES - DES
ECC
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
False
Cryptography is the process of attempting to return an encrypted message to its original form. True or False
False
DES, AES, RSA, and ECC are all examples of symmetric encryption. True or False
False
Decryption is the process of creating ciphertext from plaintext. True or False
False
Hashing functions are special mathematical functions that performs a two-way encryption. True or False
False
The benefit of SHA-1 over MD5 is that it is resistant to a collision attack. True or False
False
The strength of a symmetric encryption is based on the secrecy of the algorithm, but the key can be public. True or False
False
A special mathematical function that performs one-way encryption is called - Asymmetric encryption - Transposition cipher - Hashing function - Multiple encryption
Hashing function
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
Integrity
Keeping a copy of an encryption key with a trusted third party is known as - CYA - Key escrow - Key redundancy - Key management
Key escrow
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
Nonrepudiation
The Vigenère cipher works as a - Asymmetric encryption cipher - Transposition and substitution cipher - Polyalphabetic transposition cipher - Polyalphabetic substitution cipher
Polyalphabetic substitution cipher
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
Poor key management
Which of the following is NOT a hashing algorithm - SHA1 - MD2 - SHA3 - MD5
SHA3
The ROT13 cipher is an example of a - Shift cipher - Substitution cipher - Transposition cipher - Vigenère cipher
Shift cipher
All of the following are cryptographic applications EXCEPT: - PGP - FreeOTFE - StegDetect - GnuPG
StegDetect
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
Steganography
Encrypting a message by simply rearranging the order of the letters is a function of the - Shift cipher - Substitution cipher - Transposition cipher - Vigenère cipher
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
Substitution cipher
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
Symmetric encryption
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
True
Hiding a text file in a jpg file is an example of steganography. True or False
True
The Vigenère cipher is a polyalphabetic substitution cipher. True or False
True
