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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
hybrid cryptosystem
symmetric ciphers
PPTP
S/MIME
2. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation
L2TP
ciphertext
transport layer security
TKIP
3. Asymmetric cryptography - hashes - and digital signatures provide __________
asymmetric key
non repudiation
Message Authentication Code
decryption
4. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key
DES
DES
wired equivalency privacy
TKIP
5. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest
four modes of DES
secure hash algorithm
non repudiation
DSS
6. A cryptographic checksum used to provide integrity in symmetric key cryptography
Message Authentication Code
ciphertext
X.509
WPA2
7. Most widely used tunneling protocol - over port 1723 - data carried in an IP tunnel over Generic Routing Encapsulation (GRE)
confidentiality
symmetric ciphers
PPTP
four modes of DES
8. Selected by NIST for cryptographic hash functions for public use - 160 bit length
SHA
encryption
tunneling
collision
9. Encrypted text - also called cryptogram
ciphertext
DSS
cryptography
encryption
10. Security enhancement for MIME - provides signed (SHA-1) and encrypted (RSA and Diffe-Helman) email messasges
trusted platform module
S/MIME
Hash Message Authentication Code
key
11. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for
block cipher
MIME
trusted platform module
hashing
12. Cipher block chaining (CBC) - cipher feedback (CFB) - electronic code book (ECB) and output feedback (OFB)
four modes of DES
integrity
tunneling
MD5
13. Sender/receiver share the same key - fast - provides confidentiality - key management issue
hybrid
symmetric key
S-HTTP
Message Authentication Code
14. PGP and SSH
triple DES
hybrid
PPTP
secure hash algorithm
15. Common tunneling protocol integrated in Windows - works well with NAT - maybe blocked at firewall
hybrid cryptosystem
PPTP
asymmetric key
SHA-2
16. Tunneling protocol originally used on UNIX - uses port 22 - typically used for remote administration - replaces telnet and FTP
four modes of DES
SSH
symmetric key
encryption
17. Symmetric cryptography with MAC - asymmetric cryptography - and hashes provide __________
integrity
wired equivalency privacy
RSA
elliptic curve
18. Most widely used asymmetric algorithm - used for digital signatures - key exchange - and encryption
RSA
DES
trusted platform module
hashing
19. Technique of encapsulating one packet of data within another type to create a secure link of transportation
symmetric ciphers
unclassified data
tunneling
SSL
20. An algorithm developed to secure wireless that uses AES (CCMP + AES)
SSL
decryption
WPA2
encryption
21. Developed to replace DES based on Rijndael variable block cipher - has a fixed block length and key lengths: 128 - 192 - or 256 bits
AES
non repudiation
HTTPS
block cipher
22. Method of encryption and decryption
MD5
digital signature
cipher
encryption
23. Enciphers fixed-size blocks of bits using substitution and permutation
digital signature
ciphertext
block cipher
TKIP
24. DES - 3DES - AES - Twofish - Blowfish - IDEA - Skipjack - RC2 -RC4 - RC5 - RC6
steganography
symmetric key algorithms
SSL
block cipher
25. A protocol suite for securing network connections using IKE - AH - and ESP
stream cipher
S-HTTP
ciphertext
IPSec
26. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution
stream cipher
triple DES
plaintext
SSH
27. 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
cryptanalysis
one time pad
MD5
HMAC
28. PPTP - L2TP - IPSec - and SSH
DES
tunneling protocols
triple DES
hybrid
29. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman
asymmetric key algorithms
encryption
SSL
tunneling protocols
30. Altering the form of a message to disguise its meaning
PPTP
whole disk encryption
trusted platform module
cryptography
31. Encrypting all data on a disk using common algorithms (AES) - requires a key (passpharse - USB key) in memory to decrypt disk
whole disk encryption
unclassified data
cipher
TPM
32. Two different pieces of data have the same hash value
key
cryptanalysis
collision
stream cipher
33. Symmetric cryptography - asymmetric cryptography - and hashes provide __________
X.509
symmetric key
WPA2
confidentiality
34. Unencrypted text - also called cleartext
cryptography
DSS
NTLM
plaintext
35. An internet email standard format specifying how multimedia and attachments are handled
symmetric ciphers
MIME
transport layer security
HTTPS
36. Uses symmetric key for integrity and confidentiality (bulk transaction) and asymmetric key for authentication - nonrepudiation - and key exchange
DES
hybrid cryptosystem
MIME
steganography
37. Used by WPA - uses RC4 with IV - blocks replay attacks with packet sequence counter - replaced by WPA2
HMAC
DES
TKIP
HTTPS
38. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key
digital signature
S/MIME
hashing
decryption
39. Digital signature standard that uses 2 algorithms: RSA and DSA (based on El Gamal) - both use the Secure Hash Standard (SHA-1)
TPM
DSS
digital signature
SHA
40. Password storage hash for Windows systems after XP - uses MD4 and full unicode character set
key
cipher
NTLM
cryptanalysis
41. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case
lanman
confidentiality
S-HTTP
collision
42. Art of hiding communications - i.e. hide information in graphic files - sound files - or slack space.
SHA-2
SSH
steganography
HMAC
43. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption
symmetric key algorithms
digital signature
elliptic curve
IPSec
44. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response
S-HTTP
tunneling protocols
SSH
RSA
45. Process of transforming plaintext into unreadable format
MIME
encryption
confidentiality
X.509
46. Runs on top of TLS on port 443 - protected against MITM attacks and creates secure connections
SSL
HTTPS
TKIP
tunneling
47. Has a transport and tunnel mode - tunnel mode is used to create VPN connections
block cipher
IPSec
hybrid cryptosystem
symmetric key algorithms
48. Free email security program that uses several algorithms - symmetric (IDEA) - asymmetric (RSA) and hashes (SHA1) and the web of trust
symmetric key
PG
Message Authentication Code
digital signature
49. Pads messages to a length of 512 bits - then compresses to generate a 128 bit hash value
Hash Message Authentication Code
tunneling
DSS
MD5
50. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL
confidentiality
symmetric ciphers
Hash Message Authentication Code
TLS