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






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






4. Encrypted text - also called cryptogram






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






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






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






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






9. Method of encryption and decryption






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






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






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






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






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






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






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






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






18. PGP and SSH






19. PKI standard






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






37. PPTP - L2TP - IPSec - and SSH






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






40. Unencrypted text - also called cleartext






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






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






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






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






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






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






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






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






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






50. HMAC stands for...






Can you answer 50 questions in 15 minutes?



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