Functional Encryption Enabling Secure Leasing of Private Keys
Ryo Nishimaki · NTT technical review · 2023
Proving the non-existence of something is a difficult proposition called "the devil's proof."However, quantum mechanics can be used to prove that private keys used in functional encryption have been deleted (do not exist).It can also be used to prevent duplication of private keys.In this article, the method that my research colleague and I proposed at an international conference held by the International Association for Cryptologic Research in 2022 is overviewed, and the innovations expected when this method is implemented are described.