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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. Selected by NIST for cryptographic hash functions for public use - 160 bit length
TPM
S/MIME
symmetric key algorithms
SHA
2. Enciphers fixed-size blocks of bits using substitution and permutation
block cipher
HTTPS
secure hash algorithm
whole disk encryption
3. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest
encryption
AES
asymmetric key algorithms
secure hash algorithm
4. Free email security program that uses several algorithms - symmetric (IDEA) - asymmetric (RSA) and hashes (SHA1) and the web of trust
wired equivalency privacy
whole disk encryption
SSL
PG
5. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key
TLS
SHA
digital signature
asymmetric key
6. Sender/receiver share the same key - fast - provides confidentiality - key management issue
PG
SSL
unclassified data
symmetric key
7. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption
HMAC
elliptic curve
cryptography
MIME
8. Pads messages to a length of 512 bits - then compresses to generate a 128 bit hash value
MD5
DSS
S/MIME
whole disk encryption
9. Asymmetric cryptography - hashes - and digital signatures provide __________
PPTP
TLS
lanman
non repudiation
10. Password storage hash for Windows systems after XP - uses MD4 and full unicode character set
NTLM
trusted platform module
PG
cryptography
11. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
MD5
lanman
cipher
PPTP
12. Most widely used asymmetric algorithm - used for digital signatures - key exchange - and encryption
integrity
RSA
secure hash algorithm
MD5
13. Technique of encapsulating one packet of data within another type to create a secure link of transportation
decryption
SHA
tunneling
encryption
14. 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
elliptic curve
HMAC
SSH
symmetric key
15. An algorithm developed to secure wireless that uses AES (CCMP + AES)
WPA2
SSL
steganography
non repudiation
16. Allow client/server applcation to communicate in a secure manner across a network - TLS stands for
unclassified data
lanman
steganography
transport layer security
17. Has a transport and tunnel mode - tunnel mode is used to create VPN connections
IPSec
SHA-2
secure hash algorithm
non repudiation
18. Sequence of bits used in encryption and decryption - also known as cryptovariable
key
Message Authentication Code
hashing
cipher
19. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key
lanman
PPTP
wired equivalency privacy
hybrid cryptosystem
20. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution
asymmetric key algorithms
IPSec
AES
stream cipher
21. Data encryption standard derived from IBM Lucifer algorithm - 56-bit key - 64-bit block - uses the Data Encryption Algorithm (DEA)
DES
digital signature
steganography
four modes of DES
22. A cryptographic checksum used to provide integrity in symmetric key cryptography
IPSec
Message Authentication Code
hybrid cryptosystem
symmetric key
23. Encryption standard broken in 1998 - has a relatively short key length
digital signature
secure hash algorithm
asymmetric key
DES
24. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
trusted platform module
unclassified data
SHA
S-HTTP
25. A protocol suite for securing network connections using IKE - AH - and ESP
steganography
IPSec
MIME
four modes of DES
26. Uses symmetric key for integrity and confidentiality (bulk transaction) and asymmetric key for authentication - nonrepudiation - and key exchange
confidentiality
TLS
hybrid cryptosystem
lanman
27. AES Encryption standard used to protect sensitive but ________ - default key 128
unclassified data
steganography
triple DES
secure hash algorithm
28. Symmetric cryptography - asymmetric cryptography - and hashes provide __________
symmetric key
hybrid cryptosystem
confidentiality
SSL
29. Altering the form of a message to disguise its meaning
cryptography
SSL
MIME
key
30. 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.
PPTP
cryptanalysis
SSL
symmetric key algorithms
31. PPTP - L2TP - IPSec - and SSH
PG
tunneling protocols
hashing
lanman
32. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords
DES
whole disk encryption
hashing
L2TP
33. 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
encryption
X.509
RSA
asymmetric key
34. The cipher considered unbreakable in practice - uses XOR - also called the Vernam cipher
MD5
one time pad
steganography
collision
35. Runs on top of TLS on port 443 - protected against MITM attacks and creates secure connections
HTTPS
hybrid
hashing
cryptanalysis
36. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times
DSS
DES
triple DES
trusted platform module
37. Art of hiding communications - i.e. hide information in graphic files - sound files - or slack space.
steganography
hybrid
trusted platform module
DES
38. Encrypting a message's hash value with a private key - DOES NOT ensure confidentiality
elliptic curve
digital signature
DES
MIME
39. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation
unclassified data
L2TP
symmetric key
block cipher
40. Two different pieces of data have the same hash value
TKIP
PPTP
collision
unclassified data
41. Security enhancement for MIME - provides signed (SHA-1) and encrypted (RSA and Diffe-Helman) email messasges
integrity
DES
S/MIME
digital signature
42. Developed to replace DES based on Rijndael variable block cipher - has a fixed block length and key lengths: 128 - 192 - or 256 bits
tunneling
IPSec
tunneling protocols
AES
43. Protects against removing or installing a bogus hard drive using sealing (measuring system variables - BIOS - boot sector - firmware)
TPM
encryption
HMAC
IPSec
44. PGP and SSH
L2TP
cryptanalysis
hybrid
decryption
45. Discovering the original message using other than normal means (i.e. "breaking" the cryptosystem)
Hash Message Authentication Code
one time pad
PPTP
cryptanalysis
46. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160
secure hash algorithms
key
symmetric key
TLS
47. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman
PPTP
asymmetric key algorithms
key
L2TP
48. Symmetric cryptography with MAC - asymmetric cryptography - and hashes provide __________
TPM
confidentiality
symmetric ciphers
integrity
49. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL
tunneling protocols
TLS
unclassified data
cryptanalysis
50. Unencrypted text - also called cleartext
plaintext
SSH
hybrid cryptosystem
stream cipher