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. Method of encryption and decryption






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






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






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






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






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






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






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






9. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






14. 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






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






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






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






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






19. 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






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






21. PKI standard






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






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






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






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






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






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






28. Encrypted text - also called cryptogram






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






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






31. Block and stream






32. HMAC stands for...






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






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






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






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






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






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






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






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






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






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






43. Process of transforming plaintext into unreadable format






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






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






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






47. Unencrypted text - also called cleartext






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






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






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