Test your basic knowledge |

Comptia Security +: Cryptography

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. Most widely used tunneling protocol - over port 1723 - data carried in an IP tunnel over Generic Routing Encapsulation (GRE)






2. Cipher block chaining (CBC) - cipher feedback (CFB) - electronic code book (ECB) and output feedback (OFB)






3. A cryptographic checksum used to provide integrity in symmetric key cryptography






4. Technique of encapsulating one packet of data within another type to create a secure link of transportation






5. Provides integrity - authentication - and non-repudiation by encrypting a message digest with a private key






6. Based on use of one private/secret key - does NOT provide authentication or nonrepudiation - uses MAC






7. An algorithm developed to secure wireless - improperly implemented RC4 - only had a 40 bit key






8. Password storage hash for Windows XP - separates password into two 7 character parts and converts to upper case






9. 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.






10. A secure cryptoprocessor embedded in the motherboard used to authenticate a hardware device - TPM stands for






11. Art of hiding communications - i.e. hide information in graphic files - sound files - or slack space.






12. Sequence of bits used in encryption and decryption - also known as cryptovariable






13. Two different pieces of data have the same hash value






14. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160






15. Free email security program that uses several algorithms - symmetric (IDEA) - asymmetric (RSA) and hashes (SHA1) and the web of trust






16. PGP and SSH






17. Symmetric cryptography with MAC - asymmetric cryptography - and hashes provide __________






18. Provides digests in different lengths including 224 - 256 - 384 - and 512






19. Pads messages to a length of 512 bits - then compresses to generate a 128 bit hash value






20. Encrypting all data on a disk using common algorithms (AES) - requires a key (passpharse - USB key) in memory to decrypt disk






21. The cipher considered unbreakable in practice - uses XOR - also called the Vernam cipher






22. Most widely used asymmetric algorithm - used for digital signatures - key exchange - and encryption






23. Impossible to find a message - given only message digest - impossible to find 2 messages that produce the same message digest






24. HMAC stands for...






25. Used by WPA - uses RC4 with IV - blocks replay attacks with packet sequence counter - replaced by WPA2






26. Asymmetric cryptography - hashes - and digital signatures provide __________






27. Selected by NIST for cryptographic hash functions for public use - 160 bit length






28. PPTP - L2TP - IPSec - and SSH






29. Block and stream






30. Digital signature standard that uses 2 algorithms: RSA and DSA (based on El Gamal) - both use the Secure Hash Standard (SHA-1)






31. An internet email standard format specifying how multimedia and attachments are handled






32. Process of transforming ciphertext into plaintext (decipherment)






33. Has a transport and tunnel mode - tunnel mode is used to create VPN connections






34. Sender/receiver share the same key - fast - provides confidentiality - key management issue






35. Encrypted text - also called cryptogram






36. Tunneling protocol that merges PPTP with L2F - using port 1701 - is used over UDP - can be combined with IPSec for 5 layered encapsulation






37. Runs on top of TLS on port 443 - protected against MITM attacks and creates secure connections






38. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL






39. DES - 3DES - AES - Twofish - Blowfish - IDEA - Skipjack - RC2 -RC4 - RC5 - RC6






40. Unencrypted text - also called cleartext






41. Security enhancement for MIME - provides signed (SHA-1) and encrypted (RSA and Diffe-Helman) email messasges






42. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption






43. Symmetric cryptography - asymmetric cryptography - and hashes provide __________






44. A protocol suite for securing network connections using IKE - AH - and ESP






45. An algorithm developed to secure wireless that uses AES (CCMP + AES)






46. Allow client/server applcation to communicate in a secure manner across a network - TLS stands for






47. PKI standard






48. Password storage hash for Windows systems after XP - uses MD4 and full unicode character set






49. Developed to strengthen DES - uses 3 keys (key clustering) to encrypt 3 times






50. Common tunneling protocol integrated in Windows - works well with NAT - maybe blocked at firewall