Lessons from Defending Gemini Against Indirect Prompt Injections. - Chongyang Shi 003; Sharon Lin; Shuang Song 001; Jamie Hayes; Ilia Shumailov; Itay Yona; Juliette Pluto; Aneesh Pappu; Christopher A. Choquette-Choo; Milad Nasr; Chawin Sitawarin; Gena Gibson; et al. (CoRR, 2025)