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. PPTP - L2TP - IPSec - and SSH






2. Encrypting a message's hash value with a private key - DOES NOT ensure confidentiality






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






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






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






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






7. Method of encryption and decryption






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






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






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






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






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






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






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






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






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






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






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






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






20. Encryption standard broken in 1998 - has a relatively short key length






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






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






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






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






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






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






27. For encrypting web communications - uses Cryptographic Messaging Syntax (CMS) to protect individual message and response






28. 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






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






30. Discovering the original message using other than normal means (i.e. "breaking" the cryptosystem)






31. RSA - Diffie and Hellman - Elliptic Curve (EC) - DSS (Digital Signature Standard) - El Gamal - Merkel-Hellman






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






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






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






35. Enciphers fixed-size blocks of bits using substitution and permutation






36. A special mathematical function that peforms one way encryption - popular algorithms are SHA and MD - used to verify message/file integrity and passwords






37. Developed to replace DES based on Rijndael variable block cipher - has a fixed block length and key lengths: 128 - 192 - or 256 bits






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






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






40. PKI standard






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






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






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






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






45. Protects against removing or installing a bogus hard drive using sealing (measuring system variables - BIOS - boot sector - firmware)






46. 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.






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






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






49. Uses symmetric key for integrity and confidentiality (bulk transaction) and asymmetric key for authentication - nonrepudiation - and key exchange






50. Cryptographic algorithm that operates on plaintext - one bit at a time - and enciphers with a random generated "key stream" using substitution