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. Symmetric cryptography - asymmetric cryptography - and hashes provide __________






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






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






4. Block and stream






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






6. PGP and SSH






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






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






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






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






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






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






14. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






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






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






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






23. Process of transforming plaintext into unreadable format






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






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






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






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






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






29. 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






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






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






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






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






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






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






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






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






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






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






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






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






42. HMAC stands for...






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






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






45. PKI standard






46. Mechanism for message authentication that uses one of two algorithms (SHA-1 or MDF5) in combination with a shared secret key - also known as keyed hashing






47. Method of encryption and decryption






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






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






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