Which statement about hashing is correct?

Question

BlackTom AI · Accepted Answer

When evaluating statements about hashing, it's important to separate deterministic behavior from other properties. 
Option 1: 'Hashing can be reversed easily' is incorrect because hashing is designed to be a one-way function; given a hash, you should not be able to easily recover the original input. 
Option 2: 'Hashing changes variable names' is off-target; hashing operates on data to produce a hash value and does not inherently modify variable names or code structure. 
Option 3: 'A hash function always returns the same output for the same input' is the core property of a hash function: determinism. If you input the exact same data into the same hash function, you should receive the same hash every time. 
Option 4: 'It is used only in encryption' misstates the purpose of hashing. Hashing is used in many areas (data integrity, checksums, indexing, password storage, etc.) and is not limited to encryption tasks. 
Option 5: 'Different inputs always yield the same hash' is false; while collisions can exist (two different inputs producing the same hash) they are rare for good hash functions, and the statement asserts an always-collision, which is incorrect. 
In summary, the only statement that accurately reflects the typical property of hashing is that a hash function produces the same output for the same input, making option 3 the correct choice.

IS 4485-001 Fall 2025 Final Exam Practice 2

Which statement about hashing is correct?

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