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






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






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






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






5. Block and stream






6. 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






7. Unencrypted text - also called cleartext






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






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






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






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






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






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






14. 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






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






16. Process of transforming plaintext into unreadable format






17. PKI standard






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






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






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






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






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






23. Method of encryption and decryption






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






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






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






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






28. Process of transforming ciphertext into plaintext (decipherment)






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






30. PPTP - L2TP - IPSec - and SSH






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






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






33. Encrypted text - also called cryptogram






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






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






36. HMAC stands for...






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






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






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






40. PGP and SSH






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






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






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






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






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






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






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






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






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






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