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






2. Unencrypted text - also called cleartext






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






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






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






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






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






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






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






10. PKI standard






11. HMAC stands for...






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






13. Method of encryption and decryption






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






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






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






17. 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






18. 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.






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






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






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






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






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






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






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






27. Process of transforming plaintext into unreadable format






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






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






30. PGP and SSH






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






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






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






34. 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






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






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






37. Block and stream






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






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






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






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






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






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






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






45. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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