Of the following, which statement correctly describes the difference between a secure cipherand a secure hash?A hash produces a variable output for any input size; a cipher does not.A cipher produces the same size output for any input size; a hash does not.A hash can be reversed; a cipher cannot.A cipher can be reversed; a hash cannot.
Question
Of the following, which statement correctly describes the difference between a secure cipherand a secure hash?A hash produces a variable output for any input size; a cipher does not.A cipher produces the same size output for any input size; a hash does not.A hash can be reversed; a cipher cannot.A cipher can be reversed; a hash cannot.
Solution
One statement correctly describes the difference between a secure cipher and a secure hash. Let's analyze each option:
Option 1: "A hash produces a variable output for any input size; a cipher does not." This statement is incorrect. A hash function always produces a fixed-size output, regardless of the input size. Therefore, a hash does not produce a variable output.
Option 2: "A cipher produces the same size output for any input size; a hash does not." This statement is correct. A cipher, which is an encryption algorithm, typically produces the same size output as the input. On the other hand, a hash function can produce a fixed-size output regardless of the input size.
Option 3: "A hash can be reversed; a cipher cannot." This statement is incorrect. A hash function is designed to be one-way, meaning it is computationally infeasible to reverse the process and obtain the original input. In contrast, a cipher can be reversed using the appropriate decryption algorithm.
Option 4: "A cipher can be reversed; a hash cannot." This statement is correct. As mentioned earlier, a cipher can be reversed using the appropriate decryption algorithm. However, a hash function is designed to be irreversible, making it impossible to obtain the original input from the hash output.
Therefore, the correct statement describing the difference between a secure cipher and a secure hash is: "A cipher produces the same size output for any input size; a hash does not."
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