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






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






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






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






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. Process of transforming ciphertext into plaintext (decipherment)






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






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






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






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






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






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






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






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






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






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






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






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






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






20. Unencrypted text - also called cleartext






21. Block and stream






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






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






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






26. PKI standard






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






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






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






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






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






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






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






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






35. Method of encryption and decryption






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






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






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






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






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






41. Process of transforming plaintext into unreadable format






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






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






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






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






46. HMAC stands for...






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






48. Encrypted text - also called cryptogram






49. 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.






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