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






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






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






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






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






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






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






8. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






22. AES Encryption standard used to protect sensitive but ________ - default key 128






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






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






25. PGP and SSH






26. PPTP - L2TP - IPSec - and SSH






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






28. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






33. Encrypted text - also called cryptogram






34. Method of encryption and decryption






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






36. PKI standard






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






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






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






40. Unencrypted text - also called cleartext






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






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






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






44. Block and stream






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






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






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






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






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






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