13094842
Questão 1
Questão
A collision attack is an attempt to find two input strings of a hash function that produce the same hash result.
Responda
- True
- False
Questão 2
Questão
After the DES cipher was broken and no longer considered secure, what encryption algorithm was made as its successor?
Responda
-
AES
-
RSA
-
Twofish
-
3DES
Questão 3
Questão
Asymmetric cryptographic algorithms are also known as private key cryptography.
Responda
- True
- False
Questão 4
Questão
Ciphertext is the scrambled and unreadable output of encryption.
Responda
- True
- False
Questão 5
Questão
Data that is in an unencrypted form is referred to as which of the following?
Responda
-
plain text
-
crypttext
-
cleartext
-
simpletext
Questão 6
Questão
Encryption is the practice of transforming information so that it is secure and cannot be accessed by unauthorized parties.
Responda
- True
- False
Questão 7
Questão
GNU Privacy Guard a proprietary software that runs on different operating systems.
Responda
- True
- False
Questão 8
Questão
If Bob receives an encrypted reply message from Alice, whose private key is used to decrypt the received message?
Responda
-
Alice's private key
-
Bob's private key
-
Bob's private key and Alice's public key
-
Bob and Alice's keys
Questão 9
Questão
If using the MD5 hashing algorithm, what is the length to which each message is padded?
Responda
-
64 bits
-
128 bits
-
32 bits
-
512 bits
Questão 10
Questão
In cryptography, which of the five basic protections ensures that the information is correct and no unauthorized person or malicious software has altered that data?
Responda
-
confidentiality
-
encryption
-
availability
-
integrity
Questão 11
Questão
In information technology, non-repudiation is the process of proving that a user performed an action.
Responda
- True
- False
Questão 12
Questão
In which type of encryption is the same key used to encrypt and decrypt data?
Responda
-
public
-
asymmetric
-
symmetric
-
private
Questão 13
Questão
Obfuscation is making something well known or clear.
Responda
- True
- False
Questão 14
Questão
One of the first popular symmetric cryptography algorithms was RSA.
Responda
- True
- False
Questão 15
Questão
The SHA-1 hashing algorithm creates a digest that is how many bits in length?.
Responda
-
192 bits
-
160 bits
-
128 bits
-
96 bits
Questão 16
Questão
The simplest type of stream cipher, one in which one letter or character is exchanged for another, is known as what?
Responda
-
loop
-
lock
-
substitution
-
shift
Questão 17
Questão
The XOR cipher is based on the binary operation eXclusive OR that compares two bits.
Responda
- True
- False
Questão 18
Questão
What alternative term can be used to describe asymmetric cryptographic algorithms?
Responda
-
public key cryptography
-
user key cryptography
-
private key cryptography
-
cipher-text cryptography
Questão 19
Questão
What cryptographic method, first proposed in the mid-1980s, makes use of sloping curves instead of large prime numbers?
Responda
-
RSA
-
ECC
-
FCC
-
IKE
Questão 20
Questão
What is a block cipher algorithm that operates on 64-bit blocks and can have a key length from 32 to 448 bits?
Responda
-
Blowfish
-
Whirlpool
-
Rijndal
-
Twofish
Questão 21
Questão
What is the U.S. federal government standard for digital signatures?
Responda
-
Data Encryption Standard
-
Advanced Encryption Standard
-
Digital Signature Algorithm
-
Elliptic Curve Cryptography
Questão 22
Questão
What technology uses a chip on the motherboard of the computer to provide cryptographic services?
Responda
-
SEDs
-
TPM
-
FDE
-
HSM
Questão 23
Questão
What term best describes when cryptography is applied to entire disks instead of individual files or groups of files?
Responda
-
full disk encryption
-
system encryption
-
OS encryption
-
disk encryption
Questão 24
Questão
What term describes data actions being performed by endpoint devices, such as printing a report from a desktop computer?
Responda
-
data-in-transit
-
data-at-rest
-
data-in-use
-
data-in-play
Questão 25
Questão
What type of cipher takes one character and replaces it with one character, working one character at a time?
Responda
-
block cipher
-
unit cipher
-
single cipher
-
stream cipher
Questão 26
Questão
What type of cryptographic algorithm creates a unique digital fingerprint of a set of data?
Responda
-
hash
-
block
-
digest
-
key
Questão 27
Questão
What type of cryptography uses two keys instead of just one, generating both a private and a public key?
Responda
-
shared
-
asymmetric
-
symmetric
-
open
Questão 28
Questão
What type of message authentication code uses hashing to authenticate the sender by using both a hash function and a secret cryptographic key?
Responda
-
RIPEMD
-
HMAC
-
SHA-384
-
MD5
Questão 29
Questão
What widely used commercial asymmetric cryptography software can be used for encrypting files and email messages?
Responda
-
PGP
-
GPG
-
EFS
-
GNUPG
Questão 30
Questão
When Bob needs to send Alice a message with a digital signature, whose private key is used to encrypt the hash?
Responda
-
Bob's private key
-
Bob and Alice's keys
-
Alice's private key
-
Bob's private key and Alice's public key
Questão 31
Questão
Which hash algorithm's primary design feature is two different and independent parallel chains of computation, the results of which are then combined at the end of the process?
Responda
-
HMAC
-
RIPEMD
-
SHA-384
-
MD5
Questão 32
Questão
Which key exchange requires Alice and Bob to each agree upon a large prime number and related integer?
Responda
-
Prime-Curve
-
Quantum Prime
-
Elliptic Curve Diffie-Hellman
-
Diffie-Hellman
Questão 33
Questão
Which of the following are considered to be common asymmetric cryptographic algorithms? (Choose all that apply.)
Responda
-
Digital Signature Algorithm
-
Elliptic Curve Cryptography
-
Data Encryption Standard
-
Advanced Encryption Standard
Questão 34
Questão
Which of the following asymmetric cryptography algorithms is most commonly used?
Responda
-
AES
-
Blowfish
-
RSA
-
Twofish
Questão 35
Questão
Which of the following is a public key system that generates random public keys that are different for each session?
Responda
-
public secrecy
-
ephemeral-secrecy
-
random-key exchange
-
perfect forward secrecy
Questão 36
Questão
Which of the following is more secure than software encryption?
Responda
-
hardware encryption
-
full disk encryption
-
private encryption
-
application encryption
Questão 37
Questão
Which of the following is not one of the functions of a digital signature?
Responda
-
verification of the sender
-
protect the public key
-
prove the integrity of the message
-
prevention of the sender from disowning the message
Questão 38
Questão
Which standard was approved by NIST in late 2000 as a replacement for DES?
Responda
-
AES
-
Twofish
-
RSA
-
3DES
Questão 39
Questão
Which type of cryptographic algorithm takes an input string of any length, and returns a string of any requested variable length?
Responda
-
sponge
-
block
-
substitution
-
loop
Questão 40
Questão
Wireless data networks are particularly susceptible to known ciphertext attacks.
Responda
- True
- False
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