Security of digital systems is becoming increasingly critical in our daily life. One important primitive is the identity based encryption (IBE). IBE has the maximum flexibility for assigning user' s public key, i.e., any arbitrary string (identity) could be the recipient' s public key. IBE has been fairly well researched inrnrecent years.rnThere are (at least) two levels of secret in an IBE scheme. For simplicity, here we only consider single layer IBE. And our following discussion affects HIBE case. They are the top-level secret, which is called the master key, and the end-level secrets, which are the users' secret keys.
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