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. PKI standard






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






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






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






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






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






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






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






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






10. PGP and SSH






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






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






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






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






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






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






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






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






19. HMAC stands for...






20. Unencrypted text - also called cleartext






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






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






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






24. 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.






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






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






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






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






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






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






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






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






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






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






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






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






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






38. 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






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






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






41. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






46. Block and stream






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






48. PPTP - L2TP - IPSec - and SSH






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






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