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






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






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






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






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






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






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






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






10. Encrypted text - also called cryptogram






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






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






13. 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






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






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






16. Unencrypted text - also called cleartext






17. Block and stream






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






35. 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






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






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






38. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






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






45. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






49. Method of encryption and decryption






50. HMAC stands for...