Defining Cost Function of Steganography with Large Language Models

TL;DR

This paper introduces a novel two-stage method using large language models and evolutionary search to design effective cost functions for steganography, significantly improving resistance to detection tools.

Contribution

It is the first work to leverage LLMs for designing steganography cost functions, combining program synthesis and evolutionary search for superior results.

Findings

Designed cost functions outperform existing methods in resisting steganalysis.

The two-stage approach effectively identifies optimal cost functions.

Demonstrates the potential of LLMs in steganography design.

Abstract

In this paper, we make the first attempt towards defining cost function of steganography with large language models (LLMs), which is totally different from previous works that rely heavily on expert knowledge or require large-scale datasets for cost learning. To achieve this goal, a two-stage strategy combining LLM-guided program synthesis with evolutionary search is applied in the proposed method. In the first stage, a certain number of cost functions in the form of computer programs are synthesized from LLM responses to structured prompts. These cost functions are then evaluated with pretrained steganalysis models so that candidate cost functions suited to steganography can be collected. In the second stage, by retraining a steganalysis model for each candidate cost function, the optimal cost function(s) can be determined according to the detection accuracy. This two-stage strategy is performed by an iterative fashion so that the best cost function can be collected at the last iteration. Experiments show that the proposed method enables LLMs to design new cost functions of steganography that significantly outperform existing works in terms of resisting steganalysis tools, which verifies the superiority of the proposed method. To the best knowledge of the authors, this is the first work applying LLMs to the design of advanced cost function of steganography, which presents a novel perspective for steganography design and may shed light on further research.