Generative linguistic steganography mainly utilized language models and
applied steganographic sampling (stegosampling) to generate high-security
steganographic text (stegotext). However, previous methods generally lead to
statistical differences between the conditional probability distributions of
stegotext and natural text, which brings about security risks. In this paper,
to further ensure security, we present a novel provably secure generative
linguistic steganographic method ADG, which recursively embeds secret
information by Adaptive Dynamic Grouping of tokens according to their
probability given by an off-the-shelf language model. We not only prove the
security of ADG mathematically, but also conduct extensive experiments on three
public corpora to further verify its imperceptibility. The experimental results
reveal that the proposed method is able to generate stegotext with nearly
perfect security.

本文提出一种名为 ADG 的具有可证明安全性的生成语言隐写方法，该方法使用自适应动态分组的令牌递归嵌入秘密信息以提高安全性。 通过在三个公共语料库上进行广泛实验，证明了 ADG 的不可察觉性并成功生成几乎完美安全的隐写文本。