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






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






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






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






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






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






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






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






9. Encrypted text - also called cryptogram






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






11. HMAC stands for...






12. SHA-1 - MD2/ MD4 - MD5 - Fasthash - Triple DES-MAC - Tiger - and RIPEMD-160






13. Method of encryption and decryption






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






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






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






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






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






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






20. 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






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






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






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






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






25. PPTP - L2TP - IPSec - and SSH






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






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






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






29. Block and stream






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






31. Process of transforming plaintext into unreadable format






32. 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.






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






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






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






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






37. PKI standard






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






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






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






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






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






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






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






45. Unencrypted text - also called cleartext






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






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






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






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






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