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






2. Method of encryption and decryption






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






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






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






6. PKI standard






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






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






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






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






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






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






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






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






15. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






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






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






23. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






29. PGP and SSH






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






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






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






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






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






35. Unencrypted text - also called cleartext






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






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






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






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






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






41. Block and stream






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






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






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






45. 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






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






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






48. Process of transforming plaintext into unreadable format






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






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