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






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






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






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






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






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






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






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






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






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






11. Block and stream






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






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






14. PKI standard






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






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






17. Method of encryption and decryption






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






19. 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






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






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






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






23. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






49. Process of transforming plaintext into unreadable format






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