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. Two different pieces of data have the same hash value






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






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






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






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






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






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






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






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






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






12. Encrypted text - also called cryptogram






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






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






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






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






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






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






21. 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






22. PGP and SSH






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






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






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






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






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






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






29. HMAC stands for...






30. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






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






37. Unencrypted text - also called cleartext






38. Method of encryption and decryption






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






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






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






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






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






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






45. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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