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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. 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
asymmetric key
X.509
symmetric key
TLS
2. Cipher block chaining (CBC) - cipher feedback (CFB) - electronic code book (ECB) and output feedback (OFB)
four modes of DES
asymmetric key algorithms
RSA
DSS
3. Process of transforming plaintext into unreadable format
encryption
secure hash algorithm
SHA-2
AES
4. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key
ciphertext
digital signature
whole disk encryption
elliptic curve
5. Allow client/server applcation to communicate in a secure manner across a network - TLS stands for
secure hash algorithm
transport layer security
key
symmetric key
6. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times
triple DES
integrity
L2TP
secure hash algorithm
7. Discovering the original message using other than normal means (i.e. "breaking" the cryptosystem)
cryptanalysis
RSA
HTTPS
hybrid
8. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160
transport layer security
secure hash algorithms
MIME
block cipher
9. A cryptographic checksum used to provide integrity in symmetric key cryptography
X.509
Message Authentication Code
RSA
DSS
10. Unencrypted text - also called cleartext
block cipher
lanman
HTTPS
plaintext
11. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption
wired equivalency privacy
digital signature
elliptic curve
MD5
12. PPTP - L2TP - IPSec - and SSH
symmetric key
ciphertext
non repudiation
tunneling protocols
13. Encryption standard broken in 1998 - has a relatively short key length
encryption
one time pad
DES
steganography
14. 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.
decryption
SSL
RSA
lanman
15. Sender/receiver share the same key - fast - provides confidentiality - key management issue
symmetric ciphers
symmetric key
SSH
cipher
16. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation
IPSec
lanman
secure hash algorithms
L2TP
17. Free email security program that uses several algorithms - symmetric (IDEA) - asymmetric (RSA) and hashes (SHA1) and the web of trust
PG
symmetric ciphers
collision
transport layer security
18. Encrypting all data on a disk using common algorithms (AES) - requires a key (passpharse - USB key) in memory to decrypt disk
decryption
Message Authentication Code
lanman
whole disk encryption
19. Asymmetric cryptography - hashes - and digital signatures provide __________
non repudiation
Hash Message Authentication Code
one time pad
NTLM
20. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
lanman
decryption
Hash Message Authentication Code
RSA
21. Used by WPA - uses RC4 with IV - blocks replay attacks with packet sequence counter - replaced by WPA2
four modes of DES
ciphertext
symmetric key algorithms
TKIP
22. Method of encryption and decryption
digital signature
cipher
Hash Message Authentication Code
trusted platform module
23. AES Encryption standard used to protect sensitive but ________ - default key 128
tunneling protocols
confidentiality
unclassified data
cryptography
24. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords
block cipher
hashing
DES
L2TP
25. Digital signature standard that uses 2 algorithms: RSA and DSA (based on El Gamal) - both use the Secure Hash Standard (SHA-1)
hashing
wired equivalency privacy
DSS
TKIP
26. An algorithm developed to secure wireless that uses AES (CCMP + AES)
RSA
stream cipher
WPA2
symmetric key
27. Technique of encapsulating one packet of data within another type to create a secure link of transportation
SHA-2
triple DES
tunneling
HTTPS
28. An internet email standard format specifying how multimedia and attachments are handled
trusted platform module
MIME
MD5
confidentiality
29. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest
wired equivalency privacy
secure hash algorithm
WPA2
non repudiation
30. 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
DES
HMAC
HTTPS
plaintext
31. The cipher considered unbreakable in practice - uses XOR - also called the Vernam cipher
HMAC
cipher
key
one time pad
32. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman
transport layer security
WPA2
MIME
asymmetric key algorithms
33. Symmetric cryptography with MAC - asymmetric cryptography - and hashes provide __________
integrity
L2TP
S/MIME
symmetric key algorithms
34. Runs on top of TLS on port 443 - protected against MITM attacks and creates secure connections
symmetric ciphers
hybrid
block cipher
HTTPS
35. PKI standard
wired equivalency privacy
trusted platform module
X.509
stream cipher
36. PGP and SSH
asymmetric key algorithms
hybrid
Message Authentication Code
unclassified data
37. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response
plaintext
AES
L2TP
S-HTTP
38. Art of hiding communications - i.e. hide information in graphic files - sound files - or slack space.
steganography
PPTP
digital signature
cryptography
39. Enciphers fixed-size blocks of bits using substitution and permutation
tunneling
SSH
cryptanalysis
block cipher
40. Protects against removing or installing a bogus hard drive using sealing (measuring system variables - BIOS - boot sector - firmware)
decryption
TPM
DES
symmetric key algorithms
41. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key
wired equivalency privacy
PPTP
cipher
key
42. Most widely used tunneling protocol - over port 1723 - data carried in an IP tunnel over Generic Routing Encapsulation (GRE)
DES
PPTP
WPA2
IPSec
43. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
cipher
asymmetric key algorithms
DES
trusted platform module
44. Password storage hash for Windows systems after XP - uses MD4 and full unicode character set
non repudiation
NTLM
decryption
integrity
45. A protocol suite for securing network connections using IKE - AH - and ESP
SSL
DES
IPSec
stream cipher
46. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL
secure hash algorithm
TLS
S/MIME
AES
47. Block and stream
stream cipher
cryptography
symmetric ciphers
AES
48. Two different pieces of data have the same hash value
collision
unclassified data
encryption
trusted platform module
49. DES - 3DES - AES - Twofish - Blowfish - IDEA - Skipjack - RC2 -RC4 - RC5 - RC6
digital signature
symmetric key algorithms
MIME
HMAC
50. Selected by NIST for cryptographic hash functions for public use - 160 bit length
DES
IPSec
SHA
HMAC