Hardware Wallet Multi-Source Entropy Mixer Simulator

Live Stream Entropy Accumulator HKDF-HMAC-SHA256

Visualizing real-time continuous entropy bitstream aggregation. Dynamic wave disturbance indicates raw physical noise variations prior to extractor conditioning.

NIST SP 800-90B Min-Entropy & Bit Distribution NIST SP 800-90B PASS

Raw Stream Entropy 7.95 bits / byte

Extracted Entropy 7.999 bits / byte

Bias Reduction 98.4% attenuation

Single Source Status Protected multi-fault safe

Entropy Source Control Deck

1. Hardware TRNG

Active

Entropy/Byte 7.80

TRNG Hardware Bias 5.0%

2. User Motion / Jitter

Active

Entropy/Byte 4.20

Timing Bias 20.0%

3. MCU ADC Thermal Noise

Active

Entropy/Byte 6.50

Thermal Drift Bias 10.0%

Cryptographic Extractor Engine

HMAC-SHA256 HKDF Full Cryptographic Extractor (NIST Recommendation) Raw XOR Stream Linear Bitwise XOR Accumulator

⚠️ Backdoor / Failure Simulation

Simulate a catastrophic hardware TRNG lock/backdoor. Check how HKDF extractor maintains full entropy even when TRNG is compromised.

Trace the saved watermark counting rules and fixture limits

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Read the explanation

The saved entropy mixer averages the entered entropy values and adds point eight if more than one source is active, then clamps between point five and seven point nine five. Two illustrative six-bit-per-byte sources give six point eight; one six-bit source gives six. Both bars measure assigned entropy at eighty pixels per bit per byte. This authored combination rule is not an entropy measurement or general theorem about correlated hardware sources. Its HKDF labelled branch assigns seven point nine nine nine whenever the largest entered source entropy is greater than one. At exactly one or below it assigns six point two. Both bars show those branch constants at seventy pixels per bit per byte. The source does not actually run HMAC or HKDF on hardware samples. Its pass badge simply compares assigned output to seven point eight, rather than executing a NIST assessment or proving wallet security. In the XOR labelled branch bias reduction is the larger of ten and sixty-five times one minus average bias. Average bias point two assigns fifty-two percent; point five assigns thirty-two point five percent. Both bars show percentages at ten pixels per percentage point. The displayed seed string is built from a simple character hash plus a fixed suffix, not a cryptographic digest of sampled entropy. This is a teaching simulation, not a source of secret wallet material or a validated security audit.