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. Block and stream






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






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






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






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






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






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






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






9. Encrypted text - also called cryptogram






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






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






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






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






14. PGP and SSH






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






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






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






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






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






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






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






22. Method of encryption and decryption






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






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






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






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






27. 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






28. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






34. Unencrypted text - also called cleartext






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






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






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






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






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






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






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






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






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






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






45. Process of transforming plaintext into unreadable format






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






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






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






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






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