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






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






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






4. Method of encryption and decryption






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






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






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






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






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






10. Unencrypted text - also called cleartext






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






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






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






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






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






16. PKI standard






17. 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






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






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






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






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






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






23. HMAC stands for...






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






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






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






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






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






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






30. Encrypted text - also called cryptogram






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






32. Process of transforming plaintext into unreadable format






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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






48. Block and stream






49. 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






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