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






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






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






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






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






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






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






8. 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.






9. Encrypted text - also called cryptogram






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






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






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






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






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






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






16. Block and stream






17. Process of transforming plaintext into unreadable format






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






19. PKI standard






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






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






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






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






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






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






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






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






28. Method of encryption and decryption






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






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






31. PPTP - L2TP - IPSec - and SSH






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






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






34. Unencrypted text - also called cleartext






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






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






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






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






39. 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






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






41. 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






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






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






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






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






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






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






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






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






50. Process of transforming ciphertext into plaintext (decipherment)