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






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






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






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






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






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






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






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






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






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






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






12. 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.






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






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






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






16. Encrypted text - also called cryptogram






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






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






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






20. HMAC stands for...






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. Altering the form of a message to disguise its meaning






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






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






25. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






29. Process of transforming plaintext into unreadable format






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






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






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






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






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






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






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






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






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






39. Block and stream






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






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






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






43. PGP and SSH






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






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






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






47. 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






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






49. PPTP - L2TP - IPSec - and SSH






50. PKI standard







Sorry!:) No result found.

Can you answer 50 questions in 15 minutes?


Let me suggest you:

Browse all subjects

Browse all tests

Most popular tests



Major Subjects

Tests & Exams


AP
CLEP
DSST
GRE
SAT
GMAT

Browse all subjects

Browse all tests

Most popular tests