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. Unencrypted text - also called cleartext






2. 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






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






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






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






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






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






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






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






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






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






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






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






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






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






16. Process of transforming plaintext into unreadable format






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






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






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






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






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






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






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






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






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






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






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






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






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






30. Block and stream






31. 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.






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






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






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






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






36. Encrypted text - also called cryptogram






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






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






39. PGP and SSH






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






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






42. Method of encryption and decryption






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






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






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






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






47. PKI standard






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






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






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