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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






20. PPTP - L2TP - IPSec - and SSH






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






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






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






24. 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.






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






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






27. PKI standard






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






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






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






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






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






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






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






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






36. 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






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






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






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






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






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






42. Process of transforming ciphertext into plaintext (decipherment)






43. Process of transforming plaintext into unreadable format






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






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






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






47. 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






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






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






50. PGP and SSH