Gandalf the Red: Adaptive Security for LLMs. - Niklas Pfister; Václav Volhejn; Manuel Knott 003; Santiago Arias; Julia Bazinska; Mykhailo Bichurin; Alan Commike; Janet Darling; Peter Dienes; Matthew Fiedler; David Haber; Matthias Kraft; et al. (CoRR, 2025)