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






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






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






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






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






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






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






8. 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.






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






10. PKI standard






11. Block and stream






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






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






14. PPTP - L2TP - IPSec - and SSH






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






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






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






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






19. 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






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






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






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






23. Method of encryption and decryption






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






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






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






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






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






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






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






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






33. HMAC stands for...






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






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






36. Process of transforming ciphertext into plaintext (decipherment)






37. Encrypted text - also called cryptogram






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






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






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






41. Most efficient algorithm - used for smart cards and cell phones - provides digital signatures - secure key exchange - and encryption






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






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






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






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






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






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






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






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






50. 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