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one to many PKTRSE which we call multi-user PKTRSE (MUPKTRSE). In our MUPKTRSE model, the sender transmits an encrypted message so that only the intended authorized user group member can search the target cipher text containing specified keywords before a pre-set release time, but each authorized receiver cannot decrypt
only the intended receiver can search target cipher text containing specified keywords after a pre-set release time in the future. We begin by explaining what is PKTRSE and introducing the application scenario of PKTRSE. Then, we show the preconditions of timed-release public key encryption combining other asymmetric
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