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True or false about cryptography

Exercise and reference answers

Questions
  1. Statement is true
    No
    Statement
    A hash output grows with the input size.
  2. Statement is true
    Yes
    Statement
    A MAC uses a symmetric key.
  3. Statement is true
    No
    Statement
    A block cipher changes the length of a block.
  4. Statement is true
    Yes
    Statement
    A signature is verified with the public key.
  5. Statement is true
    Yes
    Statement
    A MAC detects accidental changes too.
Instructions
Decide whether each statement is true or false.

Explanation

_Source: NIST SP 800-175B Rev. 1, 'Guideline for Using Cryptographic Standards in the Federal Government'_
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