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






2. Method of encryption and decryption






3. 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.






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






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






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






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






8. Process of transforming plaintext into unreadable format






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






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






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






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






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






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






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






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






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






18. HMAC stands for...






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






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






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






22. Block and stream






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






24. PKI standard






25. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






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






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






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






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






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






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






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






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






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






40. 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






41. Encrypted text - also called cryptogram






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






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






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






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






46. PGP and SSH






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






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






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






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