StegGuard: Fingerprinting Self-supervised Pre-trained Encoders via Secrets Embeder and Extractor

• URL: http://arxiv.org/abs/2310.03380v1
• Date: Thu, 5 Oct 2023 08:30:42 GMT
• Title: StegGuard: Fingerprinting Self-supervised Pre-trained Encoders via Secrets Embeder and Extractor
• Authors: Xingdong Ren, Tianxing Zhang, Hanzhou Wu, Xinpeng Zhang, Yinggui Wang, Guangling Sun,
• Abstract summary: We propose StegGuard, a novel fingerprinting mechanism to verify the ownership of the suspect pre-trained encoder using steganography. A critical perspective in StegGuard is that the unique characteristic of the transformation from an image to an embedding, conducted by the pre-trained encoder, can be equivalently exposed. StegGuard can reliably identify across varied independent encoders, and is robust against model stealing related attacks.
• Score: 20.88708866426335
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: In this work, we propose StegGuard, a novel fingerprinting mechanism to verify the ownership of the suspect pre-trained encoder using steganography. A critical perspective in StegGuard is that the unique characteristic of the transformation from an image to an embedding, conducted by the pre-trained encoder, can be equivalently exposed how an embeder embeds secrets into images and how an extractor extracts the secrets from encoder's embeddings with a tolerable error after the secrets are subjected to the encoder's transformation. While each independent encoder has a distinct transformation, the piracy encoder has a similar transformation to the victim. Based on these, we learn a pair of secrets embeder and extractor as the fingerprint for the victim encoder. We introduce a frequency-domain channel attention embedding block into the embeder to adaptively embed secrets into suitable frequency bands. During verification, if the secrets embedded into the query images can be extracted with an acceptable error from the suspect encoder's embeddings, the suspect encoder is determined as piracy, otherwise independent. Extensive experiments demonstrate that depending on a very limited number of query images, StegGuard can reliably identify across varied independent encoders, and is robust against model stealing related attacks including model extraction, fine-tuning, pruning, embedding noising and shuffle.

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