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Cryptographic Hash Functions
Cryptographic Hash Functions
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Intermediate
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4 intermediate
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Question 1 of 4
120s
intermediate (4/10)
conceptual
The Birthday Paradox affects hash-function security. Why does it matter for collision resistance?
Hide and think first
A.
An
n
-bit hash collides at
∼
2
n
/2
inputs, not
2
n
— so 128-bit gives only 64-bit security.
B.
Hash collisions are impossible for cryptographic hashes regardless of input volume
C.
Birthday attacks require access to the hash's secret key
D.
The Birthday Paradox only applies to dates, not to arbitrary hash outputs
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