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Stateful Certificateless Public Key Encryption with Application in Public Cloud

机译：具有公共云中的应用程序的可信证公共密钥加密

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摘要

Certificateless cryptography eliminates the key escrow problem inherent in identity based cryptosystem. Certificatateless systems are preferred in public cloud to offer security because it solves two different problems simultaneously, namely, the key escrow problem and the cumbersome certificate management. A stateful public key encryption scheme is a cryptographic primitive, in which the sender maintains state information to perform encryption. The encryption algorithm takes the intended message, receiver's public key and the current state information to produce the ciphertext, and possibly updates the state information. Decryption is straightforward and depends only on the ciphertext and secret key of the receiver. In this paper, we propose the first stateful certificateless public key encryption scheme and prove the security of the scheme in the random oracle model. This scheme finds very interesting application for sharing data in an encrypted cloud storage system.
机译：无证书加密功能消除了基于身份的密码系统中固有的主要托管问题。无可证明系统在公共云中首选提供安全性，因为它同时解决了两个不同的问题，即关键托管问题和繁琐的证书管理。有状态公钥加密方案是加密原语，其中发件人维护状态信息以执行加密。加密算法采用预期的消息，接收器的公钥和当前状态信息以产生密文，并且可能更新状态信息。解密很简单，仅取决于接收器的密文和密钥。在本文中，我们提出了第一个有证明的公钥加密方案，并在随机oracle模型中证明了方案的安全性。该方案发现在加密云存储系统中共享数据的非常有趣的应用程序。

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