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






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






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






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






5. Process of transforming plaintext into unreadable format






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






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






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






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






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






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






12. Method of encryption and decryption






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






14. Tunneling protocol originally used on UNIX - uses port 22 - typically used for remote administration - replaces telnet and FTP






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






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






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






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






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






20. Unencrypted text - also called cleartext






21. 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.






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






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






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






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






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






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






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






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






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






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






32. PKI standard






33. Altering the form of a message to disguise its meaning






34. 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






35. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






41. Block and stream






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






43. Encrypted text - also called cryptogram






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






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






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






47. HMAC stands for...






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






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






50. Process of transforming ciphertext into plaintext (decipherment)







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