@article{kbfknowledgeboundaryasfingerprintforlang,
  title = {KBF: Knowledge Boundary as Fingerprint for Language Model and Black-Box API Auditing},
  author = {Yijia Fang and Yiqing Feng and Bingyu Li and Mingxun Zhou},
  year = {2026},
  eprint = {2605.29524},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2605.29524},
}