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






2. HMAC stands for...






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






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






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






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






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






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






9. Process of transforming plaintext into unreadable format






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






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






12. Method of encryption and decryption






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






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






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






16. Block and stream






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






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






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






20. 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.






21. Encrypted text - also called cryptogram






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






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






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






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






26. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






40. 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






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






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






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






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






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






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






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






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






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






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