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arxiv: 2606.11698 · v1 · pith:MD45NO7Snew · submitted 2026-06-10 · 💻 cs.CR · cs.AI

T2S: A Rehearsal-Based Approach for Extraction-Resistant Model Watermarking

Pith reviewed 2026-06-27 09:22 UTC · model grok-4.3

classification 💻 cs.CR cs.AI
keywords model watermarkingmodel extraction attackswatermark robustnesstransferabilityrehearsal-based trainingtrigger setAI intellectual property
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The pith

Simulating extraction during watermark training produces watermarks that transfer to stolen surrogate models.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper introduces a rehearsal-based framework that fine-tunes a watermarked model by using the loss of a simulated stolen model on a secret trigger set. This adjustment embeds the watermark so that it is more likely to survive when an adversary queries the original model and trains a surrogate. The goal is to defend against model extraction, the most damaging attack on watermark-based intellectual property protection. If the approach works, owners could still detect unauthorized copies even after the functionality has been replicated through black-box queries. Experiments across multiple settings show gains in robustness against both extraction and later watermark-removal steps.

Core claim

By treating the loss of a simulated stolen model on the trigger set as a training signal, the T2S method fine-tunes the watermark knowledge inside the target model so that the distinctive behavior transfers to any surrogate trained on the target's outputs, raising the chance that the watermark remains detectable after extraction and subsequent removal attacks.

What carries the argument

Rehearsal-based fine-tuning that uses the simulated stolen model's loss on the trigger set as the optimization signal.

If this is right

  • The watermark signature remains detectable in surrogate models built from the target's prediction outputs.
  • Robustness improves against follow-on attacks that attempt to erase the watermark after extraction succeeds.
  • The same fine-tuning step works across varied model architectures, datasets, and extraction settings in the reported tests.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The simulation idea could be extended by maintaining an ensemble of simulated extractors that differ in architecture or query cost.
  • Watermark design may need to treat extraction as an explicit adversarial game rather than a static embedding problem.
  • The method might combine with query-limiting defenses to further reduce the success of extraction before the watermark is even tested.

Load-bearing premise

Training against one simulated extraction process will produce watermark transferability that holds when real adversaries use different query strategies, model architectures, or training data.

What would settle it

Run a real model extraction attack with a query budget, architecture, or data distribution that was not used in the simulation step and measure whether the watermark detection rate in the resulting surrogate falls to chance level.

Figures

Figures reproduced from arXiv: 2606.11698 by Ao Yao, Jian-Ping Mei, Jie Xiao, Tiantian Zhu, Weibin Zhang.

Figure 1
Figure 1. Figure 1: Simulated Stolen Model (SSM) assisted watermarking. (a) [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Pipeline of the proposed T2S. The framework consists of a watermarked target model θT and a simulated stolen model (SSM) θS. During the rehearsal process, θS imitates the model extraction behavior to generate feedback signals, while θT is fine-tuned using the second-order derivatives of the watermark loss LWM with respect to its parameters (illustrated by the red dashed arrow). This meta-optimization enabl… view at source ↗
Figure 3
Figure 3. Figure 3: ACC and WSR of target and stolen models over fine-tuning epochs [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Comparison of learning curves between fine-tuning and training from scratch with different learning rates. [PITH_FULL_IMAGE:figures/full_fig_p006_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Results of stolen model after model compression. (a) results with different levels of weight quantization. (b) results with varying pruning rates. [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Results of target model after model compression. (a) results with different levels of weight quantization. (b) results with varying pruning rates. [PITH_FULL_IMAGE:figures/full_fig_p009_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: Impact of α in T2S on CIFAR-10. Target model ACC and stolen model WSR (%) with three trigger sets. Stolen models are extracted with Knockoff (soft label). 10 20 30 40 50 62 64 66 68 70 Target ACC. (%) OOD Mix Feature (a) Target Model ACC 10 20 30 40 50 92 94 96 98 100 Target WSR (%) OOD Mix Feature (b) Target Model WSR 10 20 30 40 50 58 60 62 64 66 Stolen ACC. (%) OOD Mix Feature (c) Stolen Model ACC 10 20… view at source ↗
Figure 8
Figure 8. Figure 8: Impact of α in T2S on CIFAR-100. Target model ACC and stolen model WSR (%) with three trigger sets. Stolen models are extracted with Knockoff (soft label). The average target model ACC (%) over all the combina￾tions is 88.34 ± 0.63. We observed the lowest WSR of 78% when using “cat” as the source class and “dog” as the target class. The average WSR (%) of the stolen model over all these combinations is 99.… view at source ↗
Figure 9
Figure 9. Figure 9: Heatmap of Target model ACC and WSRs with respect to different source–target pairs of CIFAR-10. airplane automobile bird cat deer dog frog horse ship truck airplane automobile bird cat deer dog frog horse ship truck 0.864 0.869 0.854 0.856 0.847 0.87 0.847 0.851 0.856 0.856 0.859 0.857 0.858 0.848 0.87 0.851 0.847 0.844 0.854 0.865 0.853 0.854 0.854 0.857 0.86 0.835 0.848 0.853 0.868 0.863 0.869 0.857 0.85… view at source ↗
Figure 10
Figure 10. Figure 10: Heatmap of Stolen model ACC and WSRs with respect to different source–target pairs of CIFAR-10. REFERENCES [1] Katrin Renz, Long Chen, Elahe Arani, and Oleg Sinavski. Simlingo: Vision-only closed-loop autonomous driving with language-action align￾ment. In IEEE/CVF Conference on Computer Vision and Pattern Recognition, pages 11993–12003, 2025. [2] Han Sun, Yunkang Cao, Hao Dong, and Olga Fink. Unseen visua… view at source ↗
read the original abstract

Model watermarking safeguards AI model intellectual property by embedding distinctive knowledge that induces unique behavioral signatures. The primary technical challenge lies in ensuring watermark robustness against various post-processing attacks on the watermarked model. Model extraction attacks emerge as the most severe threat, where adversaries exploit prediction outputs to train surrogate models that illegally replicate the original model's functionality. In this work, we propose a rehearsal-based watermark embedding framework to enhance the robustness of model watermarks against model extraction attacks. By simulating the extraction process, our method leverages the loss of a \textit{simulated stolen model} on a trigger set as a training signal to fine-tune the watermark knowledge within the target model. This fine-tuning step encourages the watermark to be embedded in a way that boosts transferability, thereby increasing its chances of persisting and remaining detectable in stolen models. Comprehensive experiments conducted under diverse settings demonstrate that the proposed method significantly improves the robustness of model watermarks against both model extraction and subsequent watermark removal attacks.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 0 minor

Summary. The manuscript proposes T2S, a rehearsal-based watermark embedding framework for model IP protection. It simulates the model extraction process by using the loss of a simulated stolen model on a trigger set as a training signal to fine-tune watermark knowledge in the target model, with the aim of boosting transferability so that the watermark persists and remains detectable in extracted surrogate models. The authors state that comprehensive experiments under diverse settings demonstrate significant improvements in robustness against both model extraction and subsequent watermark removal attacks.

Significance. If the central claim holds under real extraction attacks, the rehearsal-based simulation approach would represent a useful technical contribution to watermarking by directly optimizing for transferability rather than relying solely on post-hoc robustness. This could help address model extraction as the most severe threat to deployed model IP, provided the simulation generalizes beyond matched settings.

major comments (3)
  1. [Abstract] Abstract: the claim that 'comprehensive experiments conducted under diverse settings demonstrate that the proposed method significantly improves the robustness' is asserted without any quantitative results, baselines, error bars, ablation details, or description of the experimental protocol. This absence prevents verification of the magnitude or reliability of the claimed gains, which are load-bearing for the paper's contribution.
  2. [Abstract] Method description (abstract): the fine-tuning step uses loss from a 'simulated stolen model' on the trigger set, but provides no specification of how that simulated model is constructed (architecture family, query distribution, training data, or optimization procedure). Without these details the transferability claim cannot be assessed, as the simulation must match the threat model for the robustness gain to hold.
  3. [Abstract] Abstract / weakest assumption: the method assumes that training against the simulated extractor will produce embeddings robust to real adversaries that may employ different architectures, query budgets, or out-of-distribution data. The provided text gives no indication of experiments testing mismatched simulation vs. attack settings, which directly tests whether the reported robustness improvement generalizes.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the careful reading and constructive comments on the abstract. We agree that the abstract should better convey key details and will revise it accordingly while preserving its concise nature. Below we respond point-by-point to the major comments.

read point-by-point responses
  1. Referee: [Abstract] Abstract: the claim that 'comprehensive experiments conducted under diverse settings demonstrate that the proposed method significantly improves the robustness' is asserted without any quantitative results, baselines, error bars, ablation details, or description of the experimental protocol. This absence prevents verification of the magnitude or reliability of the claimed gains, which are load-bearing for the paper's contribution.

    Authors: The abstract is intentionally high-level. The full manuscript (Section 4) contains the requested quantitative results, including tables with watermark detection rates, extraction robustness metrics, comparisons against multiple baselines, error bars from repeated runs, and ablation studies on the rehearsal component. To address the concern, we will revise the abstract to include a small number of representative quantitative highlights and a brief reference to the experimental protocol. revision: yes

  2. Referee: [Abstract] Method description (abstract): the fine-tuning step uses loss from a 'simulated stolen model' on the trigger set, but provides no specification of how that simulated model is constructed (architecture family, query distribution, training data, or optimization procedure). Without these details the transferability claim cannot be assessed, as the simulation must match the threat model for the robustness gain to hold.

    Authors: Section 3.2 of the manuscript specifies the simulated stolen model construction: it uses the same architecture family as the target model, is trained on the trigger set queries with the same optimization procedure (cross-entropy loss on the trigger labels), and employs the same data distribution. We will add a concise clause to the abstract describing this construction to make the method description self-contained. revision: yes

  3. Referee: [Abstract] Abstract / weakest assumption: the method assumes that training against the simulated extractor will produce embeddings robust to real adversaries that may employ different architectures, query budgets, or out-of-distribution data. The provided text gives no indication of experiments testing mismatched simulation vs. attack settings, which directly tests whether the reported robustness improvement generalizes.

    Authors: The full manuscript reports experiments under diverse settings (Section 4.3) that vary model architectures, query budgets, and data distributions, thereby testing generalization beyond perfectly matched simulation. While exhaustive coverage of every possible mismatch is not feasible, the reported settings include several mismatched cases. We will revise the abstract to explicitly reference these generalization experiments. revision: partial

Circularity Check

0 steps flagged

Rehearsal-based training procedure with empirical validation; no reduction to self-defined inputs

full rationale

The paper introduces a rehearsal-based fine-tuning method that simulates extraction to embed watermarks with claimed higher transferability. The abstract and description present this as a novel training procedure whose effectiveness is asserted via comprehensive experiments under diverse settings. No equations, derivations, or self-citations are shown that reduce the robustness claim to a quantity defined by the same procedure or prior author work. The central contribution remains an empirical algorithm whose performance is measured externally rather than forced by construction, yielding only minor (non-load-bearing) circularity risk at most.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Abstract-only review supplies no explicit free parameters, axioms, or invented entities; the simulated stolen model is treated as a methodological choice rather than a new postulated entity with independent evidence.

pith-pipeline@v0.9.1-grok · 5706 in / 1158 out tokens · 17959 ms · 2026-06-27T09:22:29.301629+00:00 · methodology

discussion (0)

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Reference graph

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