Paper 2005/226
Security Proof of Sakai-Kasahara's Identity-Based Encryption Scheme
Liqun Chen and Zhaohui Cheng
Abstract
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 assumption.
Metadata
- Available format(s)
-
PDF
PS
- Category
- Public-key cryptography
- Publication info
- Published elsewhere. Unknown where it was published
- Keywords
- Identity-based encryptionprovable securitybilinear pairings
- Contact author(s)
- liqun chen @ hp com
- History
- 2005-08-31: revised
- 2005-07-12: received
- See all versions
- Short URL
- https://ia.cr/2005/226
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2005/226,
author = {Liqun Chen and Zhaohui Cheng},
title = {Security Proof of Sakai-Kasahara's Identity-Based Encryption Scheme},
howpublished = {Cryptology {ePrint} Archive, Paper 2005/226},
year = {2005},
url = {https://eprint.iacr.org/2005/226}
}
