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






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






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






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






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






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






7. Process of transforming ciphertext into plaintext (decipherment)






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






9. HMAC stands for...






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






11. Encrypted text - also called cryptogram






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






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






14. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






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






21. 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






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






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






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






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






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






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






28. 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






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






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






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






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






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






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






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






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






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






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






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






40. PKI standard






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






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






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






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






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






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






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






48. 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.






49. PGP and SSH






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