Security • Estimated 30m

Cryptographic Entropy

fundamentals.entropy

Entropy measures how unpredictable a secret or random value is to an attacker. Cryptographic security depends on the entropy actually present in key material, not on whether its output merely looks random.

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Curated resources (3)

• NIST IR 8427: Full Entropy Assumption (article) Explains unpredictability, min-entropy, and why entropy determines the security strength of random bit generation.
• BIP 39: Mnemonic Code (specification) Defines the initial entropy sizes and checksum process used to create Bitcoin mnemonic phrases.
• Technical Deep Dive into the Entropy Issue (article) A concrete hardware-wallet case showing how a generator can produce plausible output with a much smaller effective search space.

Direct prerequisites (0)

• None

Direct dependents (3)

• BIP39 Mnemonics
• External Entropy
• Random Number Generators

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