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






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






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






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






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






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






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






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






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






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






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






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






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






14. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






30. 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.






31. PPTP - L2TP - IPSec - and SSH






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






33. 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






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






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






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






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






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






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






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






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






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






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






44. PGP and SSH






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






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






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






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






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






50. Unencrypted text - also called cleartext