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A random bit generator outputs bits that appear statistically independent and:

AUnblocked
BUnbounded
CUnbundled
DUnbiased
Answer & Solution
Correct answer: D. Unbiased
1. Keys must not be guessable from earlier output. 2. Two properties are required of the bit stream. 3. A random bit generator outputs bits that appear statistically independent and unbiased. 4. So the answer is unbiased. _Source: NIST SP 800-175B Rev. 1, 'Guideline for Using Cryptographic Standards in the Federal Government'_
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