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






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






3. Process of transforming ciphertext into plaintext (decipherment)






4. Encrypted text - also called cryptogram






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






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






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






8. Unencrypted text - also called cleartext






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






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






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






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






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






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






15. 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.






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






17. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






39. 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






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






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






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






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






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






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






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






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






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






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






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