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






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






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






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






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






6. Block and stream






7. HMAC stands for...






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






9. Method of encryption and decryption






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






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






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






13. Encrypted text - also called cryptogram






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






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






16. PKI standard






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






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






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






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






21. 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






22. Unencrypted text - also called cleartext






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






24. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






29. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






45. PGP and SSH






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






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






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






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






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