Which of the following describes a characteristic of a strong cryptographic hash function?
Deterministic output for the same input
Compatibility with legacy encryption standards
Variable-length output based on input size
Reversibility for authorized users
The correct answer is Deterministic output for the same input. A strong cryptographic hash function must be deterministic, meaning it always produces the same output (hash value) for the same input. This property is essential for verification purposes.
Reversibility for authorized users is incorrect because strong hash functions are deliberately not reversible for anyone - this one-way property is fundamental to their security.
Variable-length output based on input size is incorrect because hash functions produce a fixed-length output regardless of input size; this fixed output length is a defining characteristic.
Compatibility with legacy encryption standards is incorrect because compatibility with legacy encryption standards is not a defining characteristic of hash functions, which are distinct from encryption algorithms.
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