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






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






3. Encrypted text - also called cryptogram






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






5. 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






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






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






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






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






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






11. Method of encryption and decryption






12. HMAC stands for...






13. Process of transforming plaintext into unreadable format






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






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






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






17. 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.






18. PKI standard






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






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






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






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






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






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






25. PGP and SSH






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






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






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






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






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






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






32. PPTP - L2TP - IPSec - and SSH






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






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






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






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






37. 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






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






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






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






41. Process of transforming ciphertext into plaintext (decipherment)






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






43. Unencrypted text - also called cleartext






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






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






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






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






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






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






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