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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. Data encryption standard derived from IBM Lucifer algorithm - 56-bit key - 64-bit block - uses the Data Encryption Algorithm (DEA)
TKIP
block cipher
Hash Message Authentication Code
DES
2. HMAC stands for...
PPTP
Hash Message Authentication Code
ciphertext
plaintext
3. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
wired equivalency privacy
trusted platform module
RSA
IPSec
4. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key
wired equivalency privacy
symmetric key
SSH
DSS
5. An internet email standard format specifying how multimedia and attachments are handled
MIME
S-HTTP
symmetric ciphers
RSA
6. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption
elliptic curve
TKIP
digital signature
HTTPS
7. Encryption standard broken in 1998 - has a relatively short key length
WPA2
DES
SHA-2
stream cipher
8. Provides digests in different lengths including 224 - 256 - 384 - and 512
symmetric key
HTTPS
SHA
SHA-2
9. Process of transforming plaintext into unreadable format
encryption
tunneling
confidentiality
ciphertext
10. Has a transport and tunnel mode - tunnel mode is used to create VPN connections
HMAC
Message Authentication Code
IPSec
MD5
11. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times
triple DES
whole disk encryption
asymmetric key algorithms
non repudiation
12. Method of encryption and decryption
cryptography
HMAC
cipher
non repudiation
13. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response
steganography
plaintext
S-HTTP
HTTPS
14. Based on use of one private/secret key - does NOT provide authentication or nonrepudiation - uses MAC
asymmetric key algorithms
wired equivalency privacy
symmetric key
DES
15. The cipher considered unbreakable in practice - uses XOR - also called the Vernam cipher
one time pad
S-HTTP
RSA
DSS
16. Block and stream
symmetric key
symmetric ciphers
plaintext
PPTP
17. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords
HTTPS
trusted platform module
hashing
cryptography
18. Security enhancement for MIME - provides signed (SHA-1) and encrypted (RSA and Diffe-Helman) email messasges
steganography
S/MIME
symmetric key
lanman
19. Encrypting a message's hash value with a private key - DOES NOT ensure confidentiality
digital signature
symmetric key algorithms
IPSec
integrity
20. 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.
symmetric ciphers
SSL
triple DES
hybrid cryptosystem
21. Encrypted text - also called cryptogram
symmetric key
ciphertext
symmetric key
tunneling protocols
22. An algorithm developed to secure wireless that uses AES (CCMP + AES)
digital signature
encryption
WPA2
DSS
23. AES Encryption standard used to protect sensitive but ________ - default key 128
symmetric key
cryptography
unclassified data
HTTPS
24. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman
DES
collision
WPA2
asymmetric key algorithms
25. DES - 3DES - AES - Twofish - Blowfish - IDEA - Skipjack - RC2 -RC4 - RC5 - RC6
symmetric key
stream cipher
Hash Message Authentication Code
symmetric key algorithms
26. 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
AES
asymmetric key
NTLM
Hash Message Authentication Code
27. Uses symmetric key for integrity and confidentiality (bulk transaction) and asymmetric key for authentication - nonrepudiation - and key exchange
transport layer security
steganography
encryption
hybrid cryptosystem
28. Sender/receiver share the same key - fast - provides confidentiality - key management issue
symmetric key
block cipher
asymmetric key algorithms
PPTP
29. Protects against removing or installing a bogus hard drive using sealing (measuring system variables - BIOS - boot sector - firmware)
TPM
hybrid
SHA-2
asymmetric key
30. Two different pieces of data have the same hash value
collision
IPSec
secure hash algorithms
SSL
31. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
IPSec
lanman
HMAC
asymmetric key algorithms
32. Common tunneling protocol integrated in Windows - works well with NAT - maybe blocked at firewall
WPA2
whole disk encryption
PPTP
symmetric key algorithms
33. Pads messages to a length of 512 bits - then compresses to generate a 128 bit hash value
stream cipher
decryption
asymmetric key
MD5
34. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL
decryption
TLS
MIME
TKIP
35. Art of hiding communications - i.e. hide information in graphic files - sound files - or slack space.
HMAC
PPTP
steganography
non repudiation
36. A protocol suite for securing network connections using IKE - AH - and ESP
IPSec
plaintext
S/MIME
TKIP
37. Sequence of bits used in encryption and decryption - also known as cryptovariable
AES
key
stream cipher
IPSec
38. Most widely used asymmetric algorithm - used for digital signatures - key exchange - and encryption
transport layer security
NTLM
RSA
non repudiation
39. Most widely used tunneling protocol - over port 1723 - data carried in an IP tunnel over Generic Routing Encapsulation (GRE)
MD5
four modes of DES
S/MIME
PPTP
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
digital signature
tunneling
HMAC
four modes of DES
41. Digital signature standard that uses 2 algorithms: RSA and DSA (based on El Gamal) - both use the Secure Hash Standard (SHA-1)
MIME
asymmetric key algorithms
DSS
symmetric key algorithms
42. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation
SSL
DES
whole disk encryption
L2TP
43. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution
MD5
stream cipher
TPM
DES
44. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160
SHA
S-HTTP
asymmetric key algorithms
secure hash algorithms
45. Discovering the original message using other than normal means (i.e. "breaking" the cryptosystem)
asymmetric key algorithms
PG
DES
cryptanalysis
46. Cipher block chaining (CBC) - cipher feedback (CFB) - electronic code book (ECB) and output feedback (OFB)
four modes of DES
triple DES
MIME
non repudiation
47. A cryptographic checksum used to provide integrity in symmetric key cryptography
Message Authentication Code
digital signature
one time pad
symmetric key
48. Used by WPA - uses RC4 with IV - blocks replay attacks with packet sequence counter - replaced by WPA2
asymmetric key
encryption
TKIP
tunneling
49. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key
digital signature
hashing
secure hash algorithms
non repudiation
50. Selected by NIST for cryptographic hash functions for public use - 160 bit length
SHA
HMAC
Hash Message Authentication Code
encryption