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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. Symmetric cryptography - asymmetric cryptography - and hashes provide __________
integrity
SSH
confidentiality
S/MIME
2. Developed to replace DES based on Rijndael variable block cipher - has a fixed block length and key lengths: 128 - 192 - or 256 bits
four modes of DES
hybrid
TPM
AES
3. Used by WPA - uses RC4 with IV - blocks replay attacks with packet sequence counter - replaced by WPA2
TKIP
wired equivalency privacy
key
PG
4. Block and stream
PPTP
SSH
symmetric ciphers
digital signature
5. Data encryption standard derived from IBM Lucifer algorithm - 56-bit key - 64-bit block - uses the Data Encryption Algorithm (DEA)
wired equivalency privacy
DES
trusted platform module
Hash Message Authentication Code
6. PGP and SSH
integrity
collision
S/MIME
hybrid
7. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times
cipher
triple DES
symmetric key algorithms
TPM
8. 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.
SSL
Hash Message Authentication Code
TKIP
SHA-2
9. Based on use of one private/secret key - does NOT provide authentication or nonrepudiation - uses MAC
symmetric key
asymmetric key
TPM
triple DES
10. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key
digital signature
Hash Message Authentication Code
cryptanalysis
symmetric key algorithms
11. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160
secure hash algorithms
transport layer security
tunneling protocols
secure hash algorithm
12. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation
SSH
L2TP
HMAC
S-HTTP
13. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key
TLS
wired equivalency privacy
DSS
SHA
14. PPTP - L2TP - IPSec - and SSH
trusted platform module
Message Authentication Code
tunneling protocols
MD5
15. The cipher considered unbreakable in practice - uses XOR - also called the Vernam cipher
S-HTTP
integrity
one time pad
L2TP
16. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
SHA
DES
hashing
lanman
17. An internet email standard format specifying how multimedia and attachments are handled
symmetric key
SHA-2
cryptography
MIME
18. Sequence of bits used in encryption and decryption - also known as cryptovariable
S/MIME
IPSec
MD5
key
19. Free email security program that uses several algorithms - symmetric (IDEA) - asymmetric (RSA) and hashes (SHA1) and the web of trust
wired equivalency privacy
PG
integrity
asymmetric key algorithms
20. Most widely used tunneling protocol - over port 1723 - data carried in an IP tunnel over Generic Routing Encapsulation (GRE)
encryption
PPTP
secure hash algorithms
TKIP
21. Cipher block chaining (CBC) - cipher feedback (CFB) - electronic code book (ECB) and output feedback (OFB)
secure hash algorithms
four modes of DES
RSA
encryption
22. Encrypting a message's hash value with a private key - DOES NOT ensure confidentiality
SHA
digital signature
block cipher
hybrid cryptosystem
23. Process of transforming plaintext into unreadable format
TLS
decryption
encryption
cipher
24. Two different pieces of data have the same hash value
triple DES
Hash Message Authentication Code
collision
tunneling
25. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest
four modes of DES
one time pad
secure hash algorithm
SSL
26. Altering the form of a message to disguise its meaning
cryptography
steganography
cryptanalysis
S-HTTP
27. A protocol suite for securing network connections using IKE - AH - and ESP
IPSec
integrity
unclassified data
NTLM
28. Has a transport and tunnel mode - tunnel mode is used to create VPN connections
secure hash algorithm
TPM
IPSec
AES
29. 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
RSA
SSH
MD5
asymmetric key
30. Asymmetric cryptography - hashes - and digital signatures provide __________
key
non repudiation
L2TP
four modes of DES
31. Pads messages to a length of 512 bits - then compresses to generate a 128 bit hash value
MD5
MIME
symmetric ciphers
unclassified data
32. Most widely used asymmetric algorithm - used for digital signatures - key exchange - and encryption
RSA
hashing
stream cipher
DSS
33. Allow client/server applcation to communicate in a secure manner across a network - TLS stands for
transport layer security
cryptanalysis
tunneling
hashing
34. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution
PPTP
stream cipher
digital signature
elliptic curve
35. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords
cipher
IPSec
hashing
DES
36. Encrypting all data on a disk using common algorithms (AES) - requires a key (passpharse - USB key) in memory to decrypt disk
whole disk encryption
decryption
lanman
confidentiality
37. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
X.509
Message Authentication Code
ciphertext
trusted platform module
38. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response
symmetric ciphers
PPTP
transport layer security
S-HTTP
39. Provides digests in different lengths including 224 - 256 - 384 - and 512
SSH
SHA-2
unclassified data
collision
40. Technique of encapsulating one packet of data within another type to create a secure link of transportation
DES
symmetric key
tunneling
asymmetric key algorithms
41. Encryption standard broken in 1998 - has a relatively short key length
WPA2
integrity
DES
SSL
42. HMAC stands for...
TKIP
DES
Hash Message Authentication Code
confidentiality
43. Digital signature standard that uses 2 algorithms: RSA and DSA (based on El Gamal) - both use the Secure Hash Standard (SHA-1)
DSS
encryption
IPSec
L2TP
44. Password storage hash for Windows systems after XP - uses MD4 and full unicode character set
wired equivalency privacy
four modes of DES
NTLM
steganography
45. PKI standard
X.509
plaintext
cryptanalysis
Message Authentication Code
46. Mechanism for message authentication that uses one of two algorithms (SHA-1 or MDF5) in combination with a shared secret key - also known as keyed hashing
PG
unclassified data
integrity
HMAC
47. Method of encryption and decryption
cipher
key
asymmetric key algorithms
non repudiation
48. Runs on top of TLS on port 443 - protected against MITM attacks and creates secure connections
digital signature
HTTPS
WPA2
TPM
49. AES Encryption standard used to protect sensitive but ________ - default key 128
L2TP
one time pad
AES
unclassified data
50. Sender/receiver share the same key - fast - provides confidentiality - key management issue
cryptanalysis
asymmetric key algorithms
plaintext
symmetric key