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. HMAC stands for...






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






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






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






5. 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.






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






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






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






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






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






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






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






13. PPTP - L2TP - IPSec - and SSH






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






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






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






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






18. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






41. PGP and SSH






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






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






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






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






46. Unencrypted text - also called cleartext






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






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






49. Process of transforming plaintext into unreadable format






50. Process of transforming ciphertext into plaintext (decipherment)