Anion Exchange-Induced Invisible Perovskite Encryption System with Time-Dependence for Confidential Information Security

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.