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






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






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






5. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






9. HMAC stands for...






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






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






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






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






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






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






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






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






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






19. PKI standard






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






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






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






23. Unencrypted text - also called cleartext






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






25. 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.






26. Encrypted text - also called cryptogram






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






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






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






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






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






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






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






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






35. Method of encryption and decryption






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






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






38. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






45. PGP and SSH






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






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






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






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






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