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






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






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






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






5. PGP and SSH






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






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






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






9. Encrypted text - also called cryptogram






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






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






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






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






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






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






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






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






18. Process of transforming plaintext into unreadable format






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






20. Method of encryption and decryption






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






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






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






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






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






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






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






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






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






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






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






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






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






34. Block and stream






35. PPTP - L2TP - IPSec - and SSH






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






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






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






39. HMAC stands for...






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






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






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






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






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






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






46. 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






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






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






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






50. PKI standard