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06 - Different uses of hashing

 1. Hash functions are so named because they appear to scramble input.
differentusesofhashing_q1.png

  TRUE

  FALSE

 2. Hashing can be defined as …

  overheating of a CPU

  the translation of one human language into another

  the encryption of each bite of data using a key

  the mapping of data of arbitrary size to a fixed size

 3. A cryptographic hashing algorithm will be a one-way function. What does this mean?

  It can only hash a specific form of data

  It is easier to compute as an input than to invert

  It can be inputed and inverted easily

  It can only be used once

 4. What is the hash total (also known as a checksum or digest)?

  The number of unencrypted characters in decimal

  The meaure of complexity of the hashing algorithm

  The number of hash operations executed

  The mathematical value of the unencrypted data

 5. Hashing is often used to protect online user passwords stored in a database.

  TRUE

  FALSE

 6. Digital signatures usually create a one-way hash value for a signature or document and …

  encrypt the hash value using a Caesar cipher

  encrypt the hash value using a private key

  publish an unencrypted hash value

  ensure the hash value is sent to one recipient only

 7. The recipient of the digital signature can then use the public key to …

  decrypt the hash value and transmit this value back to the sender to verify

  encrypt the hash value again for additional security

  exchange it for a private key

  decrypt the hash value and compare it against a reproduced hash value

 8. If the signature or document has been changed, the hash values will be …

  still identical

  impossible to decrypt

  different if the changes are significant

  different

 9. A digital certificate can be used for which of these purposes?

  To verify a public key

  To reward websites with good security

  To explain a hashing algorithm

  To encypt html

 10. The digital certificate will include a digital signature of the issuing Certificate Authority.

  TRUE

  FALSE


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