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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.15652 |
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| _version_ | 1866909338043416576 |
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| author | Gaure, Simen Koffas, Stefanos Picek, Stjepan Rønjom, Sondre |
| author_facet | Gaure, Simen Koffas, Stefanos Picek, Stjepan Rønjom, Sondre |
| contents | Large Language Models (LLMs) have gained significant popularity recently. LLMs are susceptible to various attacks but can also improve the security of diverse systems. However, besides enabling more secure systems, how well do open source LLMs behave as covertext distributions to, e.g., facilitate censorship-resistant communication? In this paper, we explore open-source LLM-based covert channels. We empirically measure the security vs. capacity of an open-source LLM model (Llama-7B) to assess its performance as a covert channel. Although our results indicate that such channels are not likely to achieve high practical bitrates, we also show that the chance for an adversary to detect covert communication is low. To ensure our results can be used with the least effort as a general reference, we employ a conceptually simple and concise scheme and only assume public models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_15652 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $$\mathbf{L^2\cdot M = C^2}$$ Large Language Models are Covert Channels Gaure, Simen Koffas, Stefanos Picek, Stjepan Rønjom, Sondre Cryptography and Security Large Language Models (LLMs) have gained significant popularity recently. LLMs are susceptible to various attacks but can also improve the security of diverse systems. However, besides enabling more secure systems, how well do open source LLMs behave as covertext distributions to, e.g., facilitate censorship-resistant communication? In this paper, we explore open-source LLM-based covert channels. We empirically measure the security vs. capacity of an open-source LLM model (Llama-7B) to assess its performance as a covert channel. Although our results indicate that such channels are not likely to achieve high practical bitrates, we also show that the chance for an adversary to detect covert communication is low. To ensure our results can be used with the least effort as a general reference, we employ a conceptually simple and concise scheme and only assume public models. |
| title | $$\mathbf{L^2\cdot M = C^2}$$ Large Language Models are Covert Channels |
| topic | Cryptography and Security |
| url | https://arxiv.org/abs/2405.15652 |