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






2. HMAC stands for...






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






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






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






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






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






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






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






10. Block and stream






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






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






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






14. PKI standard






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






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






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






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






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






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






21. 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






22. Method of encryption and decryption






23. Process of transforming plaintext into unreadable format






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






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






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






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






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






29. 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






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






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






32. PGP and SSH






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






34. Process of transforming ciphertext into plaintext (decipherment)






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






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






37. A cryptographic communications protocol at the transport layer that provides public key encryption (RSA or Diffie-Helman) - data encryption (IDEA - DES - 3DES) - server authentication - message integrity (MD5 or SHA-1) - and client authentication.






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






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






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






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






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






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






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






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






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






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






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






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






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