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. 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






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






3. Process of transforming plaintext into unreadable format






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






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






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






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






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






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






10. Unencrypted text - also called cleartext






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






12. PPTP - L2TP - IPSec - and SSH






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






14. 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.






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






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






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






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






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






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






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






22. Method of encryption and decryption






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






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






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






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






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






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






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






30. 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






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






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






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






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






35. PKI standard






36. PGP and SSH






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






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






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






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






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






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






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






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






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






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






47. Block and stream






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






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






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