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






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






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






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






5. PPTP - L2TP - IPSec - and SSH






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






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






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






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






10. 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






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






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






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






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






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






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






17. Method of encryption and decryption






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






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






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






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






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






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






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






25. 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






26. Process of transforming ciphertext into plaintext (decipherment)






27. PKI standard






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






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






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






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. Process of transforming plaintext into unreadable format






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






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






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






37. PGP and SSH






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






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






40. Unencrypted text - also called cleartext






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






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






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






44. 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.






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






46. Encrypted text - also called cryptogram






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






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






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






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