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






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






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






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






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






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






7. 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.






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






9. Encrypted text - also called cryptogram






10. 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






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






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






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






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






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






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






17. Process of transforming plaintext into unreadable format






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






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






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






21. PPTP - L2TP - IPSec - and SSH






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






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






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






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






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






27. 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






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






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






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






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






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






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






34. Unencrypted text - also called cleartext






35. PKI standard






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






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






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






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






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






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






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






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






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






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






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






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






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






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






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