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






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






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






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






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






6. Unencrypted text - also called cleartext






7. HMAC stands for...






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






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






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






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






12. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






30. Encrypted text - also called cryptogram






31. PKI standard






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






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






34. Block and stream






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






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






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






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






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






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






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






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






43. 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






44. Method of encryption and decryption






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






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






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






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






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






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