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. Encrypted text - also called cryptogram






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






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






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






5. Method of encryption and decryption






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






21. HMAC stands for...






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






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






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






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






26. Process of transforming ciphertext into plaintext (decipherment)






27. PGP and SSH






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






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






30. Unencrypted text - also called cleartext






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






32. PKI standard






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






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






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






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






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






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






40. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






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






47. Block and stream






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






49. Process of transforming plaintext into unreadable format






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