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






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






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






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






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






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






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






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






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






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






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






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






13. Method of encryption and decryption






14. 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






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






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






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






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






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






20. PGP and SSH






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






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






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






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






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






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






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






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






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






30. Block and stream






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






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






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






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






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






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






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






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






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






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






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






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






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






44. PKI standard






45. 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






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






47. Process of transforming plaintext into unreadable format






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






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






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