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Test your basic knowledge |
Comptia Security +: Cryptography
Start Test
Study First
Subjects
:
certifications
,
comptia-security-+
,
it-skills
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. Two different pieces of data have the same hash value
decryption
asymmetric key
encryption
collision
2. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest
secure hash algorithm
decryption
collision
X.509
3. Used by WPA - uses RC4 with IV - blocks replay attacks with packet sequence counter - replaced by WPA2
DES
TKIP
SHA-2
tunneling protocols
4. Developed to replace DES based on Rijndael variable block cipher - has a fixed block length and key lengths: 128 - 192 - or 256 bits
X.509
whole disk encryption
PPTP
AES
5. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response
WPA2
asymmetric key
TKIP
S-HTTP
6. Most widely used asymmetric algorithm - used for digital signatures - key exchange - and encryption
asymmetric key
RSA
digital signature
hybrid cryptosystem
7. Encrypting a message's hash value with a private key - DOES NOT ensure confidentiality
confidentiality
plaintext
WPA2
digital signature
8. Protects against removing or installing a bogus hard drive using sealing (measuring system variables - BIOS - boot sector - firmware)
TPM
asymmetric key algorithms
NTLM
S/MIME
9. Symmetric cryptography - asymmetric cryptography - and hashes provide __________
cryptanalysis
SSH
confidentiality
RSA
10. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation
L2TP
decryption
Hash Message Authentication Code
DES
11. Tunneling protocol originally used on UNIX - uses port 22 - typically used for remote administration - replaces telnet and FTP
asymmetric key algorithms
hashing
symmetric ciphers
SSH
12. Encrypted text - also called cryptogram
DES
cryptography
NTLM
ciphertext
13. Encryption standard broken in 1998 - has a relatively short key length
RSA
DES
TLS
MD5
14. A cryptographic communications protocol at the transport layer that provides public key encryption (RSA or Diffie-Helman) - data encryption (IDEA - DES - 3DES) - server authentication - message integrity (MD5 or SHA-1) - and client authentication.
Hash Message Authentication Code
wired equivalency privacy
S/MIME
SSL
15. Sequence of bits used in encryption and decryption - also known as cryptovariable
symmetric key
non repudiation
cryptography
key
16. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution
secure hash algorithm
stream cipher
symmetric key algorithms
cipher
17. A cryptographic checksum used to provide integrity in symmetric key cryptography
Message Authentication Code
whole disk encryption
TKIP
S-HTTP
18. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords
hybrid cryptosystem
hashing
ciphertext
lanman
19. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
hybrid
non repudiation
trusted platform module
IPSec
20. Based on use of one private/secret key - does NOT provide authentication or nonrepudiation - uses MAC
hybrid
stream cipher
symmetric key
L2TP
21. Based on two keys - public and private - one-way function: a key cannot decrypt what it encrypts - provides confidentiality - authentication - integrity - and nonrepudiation - Discovered by Diffie and Hellman - also known as public key
asymmetric key
decryption
Message Authentication Code
transport layer security
22. PGP and SSH
X.509
secure hash algorithms
IPSec
hybrid
23. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption
digital signature
SSL
elliptic curve
block cipher
24. Symmetric cryptography with MAC - asymmetric cryptography - and hashes provide __________
symmetric key
plaintext
TKIP
integrity
25. Has a transport and tunnel mode - tunnel mode is used to create VPN connections
secure hash algorithm
RSA
IPSec
decryption
26. Discovering the original message using other than normal means (i.e. "breaking" the cryptosystem)
cryptanalysis
TLS
transport layer security
cipher
27. Security enhancement for MIME - provides signed (SHA-1) and encrypted (RSA and Diffe-Helman) email messasges
PG
confidentiality
SSL
S/MIME
28. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL
unclassified data
TLS
HMAC
L2TP
29. HMAC stands for...
DSS
Hash Message Authentication Code
S-HTTP
X.509
30. Process of transforming ciphertext into plaintext (decipherment)
L2TP
decryption
IPSec
DES
31. Free email security program that uses several algorithms - symmetric (IDEA) - asymmetric (RSA) and hashes (SHA1) and the web of trust
confidentiality
TKIP
cryptography
PG
32. Encrypting all data on a disk using common algorithms (AES) - requires a key (passpharse - USB key) in memory to decrypt disk
MD5
whole disk encryption
one time pad
symmetric ciphers
33. Art of hiding communications - i.e. hide information in graphic files - sound files - or slack space.
unclassified data
IPSec
S/MIME
steganography
34. Technique of encapsulating one packet of data within another type to create a secure link of transportation
DES
S-HTTP
tunneling
cipher
35. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160
PPTP
Hash Message Authentication Code
wired equivalency privacy
secure hash algorithms
36. DES - 3DES - AES - Twofish - Blowfish - IDEA - Skipjack - RC2 -RC4 - RC5 - RC6
hashing
HTTPS
symmetric key algorithms
lanman
37. Unencrypted text - also called cleartext
plaintext
SHA-2
cipher
DES
38. Method of encryption and decryption
DES
cryptanalysis
cipher
DSS
39. Password storage hash for Windows systems after XP - uses MD4 and full unicode character set
NTLM
non repudiation
MD5
symmetric key
40. Sender/receiver share the same key - fast - provides confidentiality - key management issue
IPSec
cryptanalysis
symmetric key
tunneling
41. Cipher block chaining (CBC) - cipher feedback (CFB) - electronic code book (ECB) and output feedback (OFB)
hashing
cryptography
four modes of DES
NTLM
42. The cipher considered unbreakable in practice - uses XOR - also called the Vernam cipher
one time pad
confidentiality
ciphertext
symmetric key
43. Asymmetric cryptography - hashes - and digital signatures provide __________
non repudiation
secure hash algorithms
trusted platform module
TLS
44. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times
SSH
collision
TKIP
triple DES
45. PPTP - L2TP - IPSec - and SSH
whole disk encryption
tunneling
elliptic curve
tunneling protocols
46. Provides digests in different lengths including 224 - 256 - 384 - and 512
SHA-2
hybrid cryptosystem
SSH
digital signature
47. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key
hashing
DSS
TKIP
digital signature
48. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman
RSA
confidentiality
cryptanalysis
asymmetric key algorithms
49. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
decryption
lanman
TPM
PPTP
50. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key
HTTPS
wired equivalency privacy
steganography
stream cipher