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






2. 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.






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






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






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






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






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






8. HMAC stands for...






9. Encrypted text - also called cryptogram






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






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






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






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






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






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






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






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






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






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






20. Process of transforming ciphertext into plaintext (decipherment)






21. Process of transforming plaintext into unreadable format






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






23. PGP and SSH






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






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






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






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






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






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






30. Unencrypted text - also called cleartext






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






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






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






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






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






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






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






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






39. PKI standard






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






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






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






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






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






46. Method of encryption and decryption






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






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






49. PPTP - L2TP - IPSec - and SSH






50. Block and stream