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






2. Unencrypted text - also called cleartext






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






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






5. Block and stream






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






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






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






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






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






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






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






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






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






15. 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






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






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






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






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






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






21. HMAC stands for...






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






42. Encrypted text - also called cryptogram






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






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






45. 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.






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






47. 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






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






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






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