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






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






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






4. Process of transforming plaintext into unreadable format






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






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






7. 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






8. 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






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






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






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






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






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






14. HMAC stands for...






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






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






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






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






19. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






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






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






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






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






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






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






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






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






33. Block and stream






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






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






36. PKI standard






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






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






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






40. PGP and SSH






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






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






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






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






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






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






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






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






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






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