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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. Block and stream
non repudiation
one time pad
tunneling
symmetric ciphers
2. Encrypting a message's hash value with a private key - DOES NOT ensure confidentiality
hybrid
tunneling
digital signature
elliptic curve
3. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
TPM
asymmetric key
cryptography
lanman
4. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption
SSH
confidentiality
elliptic curve
collision
5. Protects against removing or installing a bogus hard drive using sealing (measuring system variables - BIOS - boot sector - firmware)
TPM
MD5
HTTPS
S-HTTP
6. 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.
IPSec
SSL
DSS
cipher
7. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL
MD5
IPSec
TLS
stream cipher
8. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest
NTLM
unclassified data
secure hash algorithm
Message Authentication Code
9. 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
S/MIME
asymmetric key
DES
IPSec
10. Art of hiding communications - i.e. hide information in graphic files - sound files - or slack space.
steganography
PPTP
four modes of DES
wired equivalency privacy
11. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
MD5
trusted platform module
hybrid cryptosystem
unclassified data
12. Runs on top of TLS on port 443 - protected against MITM attacks and creates secure connections
non repudiation
unclassified data
digital signature
HTTPS
13. Based on use of one private/secret key - does NOT provide authentication or nonrepudiation - uses MAC
one time pad
whole disk encryption
symmetric key
hybrid
14. Allow client/server applcation to communicate in a secure manner across a network - TLS stands for
transport layer security
wired equivalency privacy
tunneling protocols
IPSec
15. Encrypting all data on a disk using common algorithms (AES) - requires a key (passpharse - USB key) in memory to decrypt disk
MD5
TPM
whole disk encryption
digital signature
16. Process of transforming plaintext into unreadable format
symmetric ciphers
encryption
IPSec
whole disk encryption
17. Symmetric cryptography with MAC - asymmetric cryptography - and hashes provide __________
SHA
Message Authentication Code
block cipher
integrity
18. Data encryption standard derived from IBM Lucifer algorithm - 56-bit key - 64-bit block - uses the Data Encryption Algorithm (DEA)
symmetric key
four modes of DES
DES
symmetric key algorithms
19. Most widely used tunneling protocol - over port 1723 - data carried in an IP tunnel over Generic Routing Encapsulation (GRE)
SHA
HTTPS
PPTP
S/MIME
20. Discovering the original message using other than normal means (i.e. "breaking" the cryptosystem)
four modes of DES
decryption
lanman
cryptanalysis
21. Uses symmetric key for integrity and confidentiality (bulk transaction) and asymmetric key for authentication - nonrepudiation - and key exchange
PPTP
symmetric key
lanman
hybrid cryptosystem
22. Common tunneling protocol integrated in Windows - works well with NAT - maybe blocked at firewall
encryption
symmetric key
PPTP
DES
23. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords
tunneling
key
elliptic curve
hashing
24. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman
whole disk encryption
cipher
cryptography
asymmetric key algorithms
25. Encryption standard broken in 1998 - has a relatively short key length
DES
HMAC
transport layer security
ciphertext
26. DES - 3DES - AES - Twofish - Blowfish - IDEA - Skipjack - RC2 -RC4 - RC5 - RC6
symmetric key algorithms
DES
RSA
tunneling protocols
27. Password storage hash for Windows systems after XP - uses MD4 and full unicode character set
one time pad
hybrid cryptosystem
NTLM
Hash Message Authentication Code
28. PPTP - L2TP - IPSec - and SSH
tunneling protocols
confidentiality
SHA
wired equivalency privacy
29. Sender/receiver share the same key - fast - provides confidentiality - key management issue
S-HTTP
symmetric key
RSA
TLS
30. A cryptographic checksum used to provide integrity in symmetric key cryptography
DES
Message Authentication Code
transport layer security
whole disk encryption
31. Most widely used asymmetric algorithm - used for digital signatures - key exchange - and encryption
decryption
collision
RSA
triple DES
32. Sequence of bits used in encryption and decryption - also known as cryptovariable
TLS
SHA
X.509
key
33. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response
unclassified data
Hash Message Authentication Code
S-HTTP
symmetric ciphers
34. Encrypted text - also called cryptogram
ciphertext
PPTP
secure hash algorithm
symmetric key
35. Technique of encapsulating one packet of data within another type to create a secure link of transportation
symmetric key
tunneling
IPSec
DES
36. HMAC stands for...
TLS
Hash Message Authentication Code
WPA2
S-HTTP
37. Security enhancement for MIME - provides signed (SHA-1) and encrypted (RSA and Diffe-Helman) email messasges
four modes of DES
S/MIME
MD5
TLS
38. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times
triple DES
TPM
TLS
four modes of DES
39. Altering the form of a message to disguise its meaning
elliptic curve
PG
MIME
cryptography
40. Used by WPA - uses RC4 with IV - blocks replay attacks with packet sequence counter - replaced by WPA2
TKIP
tunneling protocols
ciphertext
integrity
41. Two different pieces of data have the same hash value
SHA
MD5
trusted platform module
collision
42. Provides digests in different lengths including 224 - 256 - 384 - and 512
lanman
block cipher
integrity
SHA-2
43. AES Encryption standard used to protect sensitive but ________ - default key 128
HTTPS
unclassified data
lanman
X.509
44. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution
L2TP
AES
stream cipher
digital signature
45. Selected by NIST for cryptographic hash functions for public use - 160 bit length
IPSec
HTTPS
PG
SHA
46. Asymmetric cryptography - hashes - and digital signatures provide __________
IPSec
HTTPS
steganography
non repudiation
47. The cipher considered unbreakable in practice - uses XOR - also called the Vernam cipher
one time pad
steganography
PG
MIME
48. Method of encryption and decryption
cipher
four modes of DES
SHA-2
non repudiation
49. Unencrypted text - also called cleartext
non repudiation
stream cipher
one time pad
plaintext
50. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key
wired equivalency privacy
HTTPS
secure hash algorithm
transport layer security