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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. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key
digital signature
confidentiality
S-HTTP
whole disk encryption
2. Uses symmetric key for integrity and confidentiality (bulk transaction) and asymmetric key for authentication - nonrepudiation - and key exchange
decryption
MIME
triple DES
hybrid cryptosystem
3. A protocol suite for securing network connections using IKE - AH - and ESP
triple DES
tunneling protocols
HTTPS
IPSec
4. An internet email standard format specifying how multimedia and attachments are handled
SSH
S/MIME
digital signature
MIME
5. Process of transforming ciphertext into plaintext (decipherment)
IPSec
lanman
decryption
X.509
6. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman
L2TP
block cipher
MD5
asymmetric key algorithms
7. Symmetric cryptography - asymmetric cryptography - and hashes provide __________
confidentiality
hashing
whole disk encryption
TKIP
8. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation
L2TP
steganography
plaintext
PG
9. HMAC stands for...
HMAC
Hash Message Authentication Code
SHA-2
TKIP
10. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times
steganography
symmetric ciphers
triple DES
symmetric key
11. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest
asymmetric key
one time pad
TPM
secure hash algorithm
12. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution
SHA
whole disk encryption
symmetric ciphers
stream cipher
13. Enciphers fixed-size blocks of bits using substitution and permutation
symmetric key algorithms
asymmetric key
block cipher
trusted platform module
14. Common tunneling protocol integrated in Windows - works well with NAT - maybe blocked at firewall
S/MIME
symmetric key
tunneling
PPTP
15. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160
whole disk encryption
wired equivalency privacy
cipher
secure hash algorithms
16. Sender/receiver share the same key - fast - provides confidentiality - key management issue
SSL
L2TP
symmetric key
X.509
17. Encrypting all data on a disk using common algorithms (AES) - requires a key (passpharse - USB key) in memory to decrypt disk
transport layer security
whole disk encryption
wired equivalency privacy
integrity
18. Digital signature standard that uses 2 algorithms: RSA and DSA (based on El Gamal) - both use the Secure Hash Standard (SHA-1)
DSS
TKIP
cryptanalysis
AES
19. PKI standard
X.509
tunneling
AES
one time pad
20. DES - 3DES - AES - Twofish - Blowfish - IDEA - Skipjack - RC2 -RC4 - RC5 - RC6
symmetric key algorithms
AES
tunneling
hybrid cryptosystem
21. Password storage hash for Windows systems after XP - uses MD4 and full unicode character set
NTLM
MIME
PPTP
SSL
22. Data encryption standard derived from IBM Lucifer algorithm - 56-bit key - 64-bit block - uses the Data Encryption Algorithm (DEA)
steganography
DES
Message Authentication Code
unclassified data
23. Unencrypted text - also called cleartext
plaintext
HTTPS
one time pad
SHA-2
24. Discovering the original message using other than normal means (i.e. "breaking" the cryptosystem)
cryptanalysis
integrity
block cipher
ciphertext
25. 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.
SHA
IPSec
SSL
HMAC
26. Encrypted text - also called cryptogram
IPSec
PG
ciphertext
stream cipher
27. Protects against removing or installing a bogus hard drive using sealing (measuring system variables - BIOS - boot sector - firmware)
plaintext
collision
TPM
HMAC
28. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL
plaintext
TLS
secure hash algorithms
steganography
29. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
S-HTTP
tunneling protocols
DES
trusted platform module
30. Provides digests in different lengths including 224 - 256 - 384 - and 512
HMAC
integrity
SHA-2
stream cipher
31. Pads messages to a length of 512 bits - then compresses to generate a 128 bit hash value
X.509
encryption
symmetric ciphers
MD5
32. Encryption standard broken in 1998 - has a relatively short key length
symmetric ciphers
Hash Message Authentication Code
DES
TKIP
33. Altering the form of a message to disguise its meaning
cryptography
stream cipher
X.509
steganography
34. Tunneling protocol originally used on UNIX - uses port 22 - typically used for remote administration - replaces telnet and FTP
SSH
HTTPS
transport layer security
Message Authentication Code
35. Method of encryption and decryption
cryptography
cipher
L2TP
hybrid
36. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
lanman
asymmetric key algorithms
Message Authentication Code
PPTP
37. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords
PG
hashing
plaintext
hybrid cryptosystem
38. PPTP - L2TP - IPSec - and SSH
L2TP
tunneling protocols
TPM
four modes of DES
39. Selected by NIST for cryptographic hash functions for public use - 160 bit length
SHA
whole disk encryption
Message Authentication Code
symmetric key
40. 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
HMAC
triple DES
plaintext
hashing
41. Encrypting a message's hash value with a private key - DOES NOT ensure confidentiality
digital signature
SHA-2
IPSec
encryption
42. A cryptographic checksum used to provide integrity in symmetric key cryptography
TKIP
MD5
Message Authentication Code
DES
43. AES Encryption standard used to protect sensitive but ________ - default key 128
digital signature
PPTP
unclassified data
SHA-2
44. Most widely used asymmetric algorithm - used for digital signatures - key exchange - and encryption
RSA
IPSec
symmetric key
transport layer security
45. PGP and SSH
AES
PPTP
hybrid
DES
46. Symmetric cryptography with MAC - asymmetric cryptography - and hashes provide __________
unclassified data
asymmetric key
S-HTTP
integrity
47. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response
lanman
S-HTTP
asymmetric key algorithms
MD5
48. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption
elliptic curve
symmetric key algorithms
SSH
plaintext
49. Based on use of one private/secret key - does NOT provide authentication or nonrepudiation - uses MAC
PPTP
asymmetric key
one time pad
symmetric key
50. Has a transport and tunnel mode - tunnel mode is used to create VPN connections
collision
IPSec
SHA
transport layer security