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






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






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






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






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






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






7. Process of transforming plaintext into unreadable format






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






9. PPTP - L2TP - IPSec - and SSH






10. 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.






11. PGP and SSH






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






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






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






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






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






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






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






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






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






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






22. 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






23. Process of transforming ciphertext into plaintext (decipherment)






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






25. Method of encryption and decryption






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






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






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






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






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






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






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






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






34. HMAC stands for...






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






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






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






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






39. PKI standard






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






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






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






43. Block and stream






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






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






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






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






49. Encrypted text - also called cryptogram






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