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






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






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






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






6. Method of encryption and decryption






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






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






9. 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






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






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






12. 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.






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






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






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






16. Process of transforming plaintext into unreadable format






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






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






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






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






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






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






23. Encrypted text - also called cryptogram






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






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






26. Block and stream






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






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






29. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






47. Data encryption standard derived from IBM Lucifer algorithm - 56-bit key - 64-bit block - uses the Data Encryption Algorithm (DEA)






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






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






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