Fast Identity-Based Encryption Using Combined Public Keys
首发时间:2009-03-20
Abstract:Identity-based encryption (IBE) is a very useful tool in cryptography. It has many potential applications. However, existing IBE schemes are signicantly slower than regular public key cryptosystems; thus, they may not be able to meet the need of some applications in practice. In this paper, we propose a simple IBE scheme, using a technique of combined public keys. Our IBE scheme is very fast, having time costs close to those of a regular public key cryptosystem, the ElGamal cryptosystem. We show that our IBE scheme is semantically secure under the Decisional Diffie-Hellman (DDH) Assumption. In addition, we give an identity-based signature scheme using the same technique.
keywords: Identity-based encryption chosen ciphertext attack discrete logarithm problem combined public key
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利用组合公钥构建的基于身份的快速加密方案
摘要:基于身份的加密方案是密码学领域研究的重点问题之一,存在很多潜在的应用。但现在存在的基于身份的加密方案主要基于双线性对,比常规的公钥加密方案慢很多,从而限制了他的进一步应用。本文利用组合公钥提出了一种简单的基于身份的快速加密方案,并在DDH假设下证明了该方案是语义安全的。另外,利用类似技术给出了基于身份的签名方案。
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