In　the　era　of　burgeoning　information　technology,　ensuring　the　impregnable　transmission　of　confidential　information　has　emerged　as　a　paramount　global　imperative.　Traditional　fluorescent　encryption　materials　are　limited　in　advanced　encryption　due　to　their　visible　properties　under　ultraviolet　light,　while　improved　stimulus-responsive　encryption　strategies　are　usually　based　on　static　information.　Herein,　we　exploit　a　novel　high-security　encryption　strategy　using　metal　halides　and　perovskite　quantum　dots　as　invisible　inks　and　developer,　respectively.　The　decryption　of　the　information　is　impervious　to　traditional　decryption　means,　necessitating　the　possession　of　the　appropriate　quadruple　key　to　accomplish　the　decryption　process.　This　approach　leverages　the　anion　exchange　mechanism　between　metal　halides　and　perovskite　quantum　dots,　thereby　enabling　a　multilevel　encryption　system.　Consequently,　the　strategy　establishes　a　multitiered　and　multifaceted　security　framework,　which　has　significant　application　potential　in　the　protection　of　confidential　information　requiring　a　superior　level　of　security　and　provides　a　novel　encryption　and　decryption　scheme　in　the　field　of　information　security.　©　2025　American　Chemical　Society.