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






2. Process of transforming ciphertext into plaintext (decipherment)






3. Method of encryption and decryption






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






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






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






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






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






9. Encrypted text - also called cryptogram






10. 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






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






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






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






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






15. Block and stream






16. Process of transforming plaintext into unreadable format






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






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






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






20. PGP and SSH






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






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






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






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






25. 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






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






27. Unencrypted text - also called cleartext






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






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






30. PPTP - L2TP - IPSec - and SSH






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






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






33. A cryptographic protocol that provides security for communications over networks such as the Internet - more secure that SSL






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






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






36. HMAC stands for...






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






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






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






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






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






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






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






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






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






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






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






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






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






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