[Resource Topic] 2005/226: Security Proof of Sakai-Kasahara's Identity-Based Encryption Scheme

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Security Proof of Sakai-Kasahara’s Identity-Based Encryption Scheme

Authors: Liqun Chen, Zhaohui Cheng


Identity-based encryption (IBE) is a special asymmetric encryption
method where a public encryption key can be an arbitrary identifier
and the corresponding private decryption key is created by binding
the identifier with a system’s master secret. In 2003 Sakai and
Kasahara proposed a new IBE scheme, which has the potential to
improve performance. However, to our best knowledge, the security of
their scheme has not been properly investigated. This work is
intended to build confidence in the security of the Sakai-Kasahara
IBE scheme. In this paper, we first present an efficient IBE scheme
that employs a simple version of the Sakai-Kasahara scheme and the
Fujisaki-Okamoto transformation, which we refer to as SK-IBE. We
then prove that SK-IBE has chosen ciphertext security in the random
oracle model based on a reasonably well-explored hardness

ePrint: https://eprint.iacr.org/2005/226

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