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






2. Method of encryption and decryption






3. PGP and SSH






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






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






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






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






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






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






10. PKI standard






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






12. Block and stream






13. PPTP - L2TP - IPSec - and SSH






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






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






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






17. 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.






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






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






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






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






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






23. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






27. 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






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






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






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






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






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






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






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






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






36. Encrypted text - also called cryptogram






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






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






39. Process of transforming plaintext into unreadable format






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






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






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






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






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






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






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






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






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






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






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