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. Block and stream






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






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






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






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






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






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






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






9. Encrypted text - also called cryptogram






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






11. 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






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






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






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






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






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






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






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






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






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






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






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






23. PKI standard






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






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






26. Method of encryption and decryption






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






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






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






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






31. PPTP - L2TP - IPSec - and SSH






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






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






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






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






36. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






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






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






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






45. HMAC stands for...






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






47. 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.






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






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






50. 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