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. Block and stream






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






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






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






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






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






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






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






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






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






11. 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






12. 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






13. 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.






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






15. PKI standard






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






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






18. Method of encryption and decryption






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






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






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






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






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






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






25. Unencrypted text - also called cleartext






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






43. PGP and SSH






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






45. PPTP - L2TP - IPSec - and SSH






46. Security enhancement for MIME - provides signed (SHA-1) and encrypted (RSA and Diffe-Helman) email messasges






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






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






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






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