AI Watermark Robustness Lab

Watermark Generator & Token Config

Prompt / Generated Text

Greenlist Ratio (γ): 0.50

Logit Bias (δ): 2.0

Hash Seed Key

Detection Threshold (α)

Evasion & Perturbation Attack

Attack Vector

Perturbation Rate: 35%

Statistical Detection Metrics Live Testbench

Clean Z-Score

5.84

Green: 76.7%

Attacked Z-Score

0.73

Green: 53.3%

Entropy Delta

+3.8%

T = 120 tokens

Attacked Watermark Status:

Watermark Evaded (Inconclusive, z < 2.33)

Gaussian Hypothesis Distribution (Null H₀ vs Watermark H₁)

Under unwatermarked null hypothesis H₀, expected greenlist count is 60.0 (50%). Clean stream contains 92 greenlist tokens (76.7%, z = 5.84, p < 0.0001). Under 35% synonym attack, greenlist count degrades to 64 (53.3%, z = 0.73), evading EU AI Act threshold.

Interactive Token Stream & Cryptographic Hash Provenance

Greenlist Token

Redlist Token

Attacked/Perturbed

Hover or click any token in the ledger to inspect its previous-token hash, pseudo-random greenlist partition, and perturbation status.