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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. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords
hashing
DES
one time pad
tunneling protocols
2. DES - 3DES - AES - Twofish - Blowfish - IDEA - Skipjack - RC2 -RC4 - RC5 - RC6
symmetric key algorithms
PPTP
wired equivalency privacy
non repudiation
3. Most widely used tunneling protocol - over port 1723 - data carried in an IP tunnel over Generic Routing Encapsulation (GRE)
cryptography
four modes of DES
PPTP
MIME
4. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key
PG
unclassified data
digital signature
hybrid cryptosystem
5. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation
L2TP
Message Authentication Code
wired equivalency privacy
ciphertext
6. Unencrypted text - also called cleartext
plaintext
RSA
DES
whole disk encryption
7. HMAC stands for...
ciphertext
Hash Message Authentication Code
hybrid
integrity
8. Cipher block chaining (CBC) - cipher feedback (CFB) - electronic code book (ECB) and output feedback (OFB)
HMAC
four modes of DES
symmetric key
key
9. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
TKIP
MD5
DES
trusted platform module
10. Digital signature standard that uses 2 algorithms: RSA and DSA (based on El Gamal) - both use the Secure Hash Standard (SHA-1)
IPSec
whole disk encryption
Hash Message Authentication Code
DSS
11. Asymmetric cryptography - hashes - and digital signatures provide __________
non repudiation
symmetric key
tunneling
SHA
12. Process of transforming ciphertext into plaintext (decipherment)
decryption
SHA-2
cryptanalysis
symmetric key algorithms
13. Technique of encapsulating one packet of data within another type to create a secure link of transportation
tunneling
transport layer security
whole disk encryption
DES
14. An algorithm developed to secure wireless that uses AES (CCMP + AES)
encryption
symmetric key
WPA2
asymmetric key
15. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution
hashing
stream cipher
elliptic curve
PPTP
16. Symmetric cryptography - asymmetric cryptography - and hashes provide __________
collision
DES
TPM
confidentiality
17. The cipher considered unbreakable in practice - uses XOR - also called the Vernam cipher
TLS
ciphertext
one time pad
wired equivalency privacy
18. Art of hiding communications - i.e. hide information in graphic files - sound files - or slack space.
X.509
SSL
steganography
lanman
19. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption
elliptic curve
symmetric key
tunneling protocols
Message Authentication Code
20. Provides digests in different lengths including 224 - 256 - 384 - and 512
SHA-2
tunneling protocols
triple DES
IPSec
21. Protects against removing or installing a bogus hard drive using sealing (measuring system variables - BIOS - boot sector - firmware)
SSH
TPM
elliptic curve
integrity
22. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response
S-HTTP
IPSec
HTTPS
SHA
23. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
AES
digital signature
cryptography
lanman
24. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman
MD5
TKIP
asymmetric key algorithms
TPM
25. Uses symmetric key for integrity and confidentiality (bulk transaction) and asymmetric key for authentication - nonrepudiation - and key exchange
MIME
cipher
four modes of DES
hybrid cryptosystem
26. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest
hashing
secure hash algorithm
elliptic curve
SSH
27. Selected by NIST for cryptographic hash functions for public use - 160 bit length
SHA
stream cipher
NTLM
encryption
28. Security enhancement for MIME - provides signed (SHA-1) and encrypted (RSA and Diffe-Helman) email messasges
RSA
unclassified data
symmetric key
S/MIME
29. Free email security program that uses several algorithms - symmetric (IDEA) - asymmetric (RSA) and hashes (SHA1) and the web of trust
integrity
PG
HTTPS
hybrid cryptosystem
30. Encrypted text - also called cryptogram
L2TP
ciphertext
HTTPS
Message Authentication Code
31. PKI standard
IPSec
X.509
PPTP
tunneling
32. Common tunneling protocol integrated in Windows - works well with NAT - maybe blocked at firewall
asymmetric key algorithms
four modes of DES
Hash Message Authentication Code
PPTP
33. Two different pieces of data have the same hash value
triple DES
TLS
hashing
collision
34. Block and stream
SSL
symmetric ciphers
AES
stream cipher
35. Encryption standard broken in 1998 - has a relatively short key length
DES
secure hash algorithms
PPTP
cryptography
36. An internet email standard format specifying how multimedia and attachments are handled
secure hash algorithms
tunneling protocols
triple DES
MIME
37. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key
tunneling protocols
cryptography
stream cipher
wired equivalency privacy
38. Runs on top of TLS on port 443 - protected against MITM attacks and creates secure connections
Hash Message Authentication Code
HTTPS
elliptic curve
AES
39. Enciphers fixed-size blocks of bits using substitution and permutation
block cipher
secure hash algorithms
S-HTTP
SSL
40. AES Encryption standard used to protect sensitive but ________ - default key 128
decryption
TKIP
unclassified data
MD5
41. Developed to replace DES based on Rijndael variable block cipher - has a fixed block length and key lengths: 128 - 192 - or 256 bits
plaintext
non repudiation
tunneling protocols
AES
42. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times
decryption
plaintext
X.509
triple DES
43. 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
triple DES
symmetric ciphers
lanman
44. Method of encryption and decryption
stream cipher
cipher
SHA
symmetric ciphers
45. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160
secure hash algorithms
cryptography
MIME
decryption
46. Tunneling protocol originally used on UNIX - uses port 22 - typically used for remote administration - replaces telnet and FTP
SSH
secure hash algorithms
symmetric key algorithms
asymmetric key
47. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL
TLS
stream cipher
hybrid
MIME
48. Data encryption standard derived from IBM Lucifer algorithm - 56-bit key - 64-bit block - uses the Data Encryption Algorithm (DEA)
HMAC
key
DES
MD5
49. Allow client/server applcation to communicate in a secure manner across a network - TLS stands for
tunneling protocols
transport layer security
elliptic curve
Hash Message Authentication Code
50. Discovering the original message using other than normal means (i.e. "breaking" the cryptosystem)
trusted platform module
symmetric key
cryptanalysis
IPSec