Test your basic knowledge |

Comptia Security +: Cryptography

Instructions:
  • Answer 50 questions in 30 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. Sender/receiver share the same key - fast - provides confidentiality - key management issue






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






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






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






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






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






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






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






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






10. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






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






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






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






19. PGP and SSH






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






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






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






23. HMAC stands for...






24. Unencrypted text - also called cleartext






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






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






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






28. Encrypted text - also called cryptogram






29. Method of encryption and decryption






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






31. 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






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






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






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






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






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






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






38. PPTP - L2TP - IPSec - and SSH






39. Block and stream






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






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






42. PKI standard






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






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






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






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






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






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






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






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