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. Process of transforming plaintext into unreadable format






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






3. 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






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






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






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






7. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






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






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






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






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






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






18. HMAC stands for...






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






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






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






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






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






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






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






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






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






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






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






30. PGP and SSH






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






32. 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.






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






34. 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






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






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






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






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






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






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






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






42. Encrypted text - also called cryptogram






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






44. Method of encryption and decryption






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






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






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






48. Unencrypted text - also called cleartext






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






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