Deck 5: Cryptography

Question 1

Which of the following is NOT a hashing algorithm

A)SHA1
B)MD2
C)SHA3
D)MD5

Answer 1

C

Question 2

What application of encryption verifies that a document was sent by the person it says it is from?

A)Digital rights management
B)Asymmetric encryption
C)Cryptographic hash
D)Digital signatures

Answer 2

D

Question 3

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

A)Social engineering
B)Steganography
C)Cryptography
D)Cryptanalysis

Answer 3

B

Question 4

Cryptographic algorithms are used for all of the following EXCEPT:

A)Confidentiality
B)Integrity
C)Availability
D)Authentication

Question 5

The ROT13 cipher is an example of a

A)Shift cipher
B)Substitution cipher
C)Transposition cipher
D)Vigenère cipher

Question 6

The cipher that replaces each letter of the alphabet with a different letter (not in sequence)is a

A)Shift cipher
B)Substitution cipher
C)Transposition cipher
D)Vigenère cipher

Question 7

Keyspace refers to

A)The location where keys are stored
B)The number of keys needed to encrypt or decrypt a message
C)All possible key values
D)The portion of the algorithm that the key connects with to encrypt or decrypt a message

Question 8

The Vigenère cipher works as a

A)Asymmetric encryption cipher
B)Transposition and substitution cipher
C)Polyalphabetic transposition cipher
D)Polyalphabetic substitution cipher

Question 9

The encryption method based on the idea of using a shared key for encryption and decryption of data is

A)Hashing function
B)Symmetric encryption
C)Asymmetric encryption
D)Elliptical curve encryption

Question 10

All of the following are asymmetric encryption algorithms EXCEPT:

A)RSA
B)3DES
C)ECC
D)ElGamal

Question 11

Keeping a copy of an encryption key with a trusted third party is known as

A)CYA
B)Key escrow
C)Key redundancy
D)Key management

Question 12

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

A)Desteganographying
B)Decrypting
C)Uncrypting
D)Cryptanalysis

Question 13

The art of secret writing that enables an individual to hide the contents of a message from all but the intended recipient is called

A)Steganography
B)Cryptanalysis
C)Cryptography
D)Key management

Question 14

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

A)Poor key management
B)A weak key
C)A weak algorithm
D)A small keyspace

Question 15

All of the following are symmetric encryption algorithms EXCEPT:

A)ECC
B)Blowfish
C)AES
D)DES

Question 16

The encryption method base on the idea of two keys,one that is public and one that is private is

A)Hashing function
B)Symmetric encryption
C)Asymmetric encryption
D)Elliptical curve encryption

Question 17

Hashing algorithms can be compromised

A)By a collision attack
B)By reverse engineering the hash
C)With a differential cryptanalysis
D)With a linear cryptanalysis

Question 18

Encrypting a message by simply rearranging the order of the letters is a function of the

A)Shift cipher
B)Substitution cipher
C)Transposition cipher
D)Vigenère cipher

Question 19

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

A)Authentication
B)Nonrepudiation
C)Confidentiality
D)Auditing

Question 20

A special mathematical function that performs one-way encryption is called

A)Asymmetric encryption
B)Transposition cipher
C)Hashing function
D)Multiple encryption

Question 21

_______________ puts the plaintext through a simplified cipher to try to deduce what the key is likely to be in a full version of the cipher.

Question 22

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.

Question 23

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.

Question 24

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

Question 25

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

Question 26

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

Question 27

_______________ is done by comparing the input plaintext to the output ciphertext to try to determine the key used to encrypt the information.

Question 28

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

Question 29

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

A)Confidentiality
B)Integrity
C)Authentication
D)Nonrepudiation

Question 30

A(n)_______________ is a special mathematical function that performs a one-way encryption.

Question 31

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

Question 32

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

A)Authentication
B)Nonrepudiation
C)Integrity
D)Confidentiality

Question 33

The Vigenère cipher is a polyalphabetic substitution cipher.

Question 34

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

A)Authentication
B)Nonrepudiation
C)Integrity
D)Confidentiality

Question 35

The process for protecting intellectual property from unauthorized used is called

A)Key escrow
B)Anti-pirating management
C)Digital signatures
D)Digital rights management

Question 36

A(n)_______________ is a step-by-step,recursive computational procedure for solving a problem in a finite number of steps.

Question 37

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

Question 38

_______________ is the process of analyzing available information in an attempt to return the encrypted message to its original form.

Question 39

All of the following are cryptographic applications EXCEPT:

A)PGP
B)FreeOTFE
C)StegDetect
D)GnuPG

Question 40

Decryption is the process of creating ciphertext from plaintext.

Question 41

A _______________ is when a hash algorithm is compromised by an attacker finding two different messages that hash to the same value.

Question 42

What are some of the uses of cryptographic algorithms?

Question 43

The process for protecting intellectual property from unauthorized use is called _______________

Question 44

What is key management and why is it important?

Question 45

Keeping a copy of the encryption key with a trusted third party is called _______________.

Question 46

_______________ is a form of cryptography technology that can detect the interception of transmitted key bits.

Question 47

_______________ are functions that difficult to process without the key but easy to process when you have the key.

Question 48

Explain two ways encryption was done in ancient times without computers.

Question 49

What is steganography and what danger does it pose to an organization's sensitive information.