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






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






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






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






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






6. Block and stream






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






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






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






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






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






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






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






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






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






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






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






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






19. PGP and SSH






20. 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






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






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






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






24. Process of transforming plaintext into unreadable format






25. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






31. Process of transforming ciphertext into plaintext (decipherment)






32. PKI standard






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






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






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






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






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






38. 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.






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






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






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






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






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






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






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






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






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






48. Method of encryption and decryption






49. Encrypted text - also called cryptogram






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