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Key-Aggregate Cryptosystem for Scalable Data Sharing in Cloud Storage

机译:用于云存储中可扩展数据共享的密钥聚合密码系统

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摘要

Data sharing is an important functionality in cloud storage. In this paper, we show how to securely, efficiently, and flexibly share data with others in cloud storage. We describe new public-key cryptosystems that produce constant-size ciphertexts such that efficient delegation of decryption rights for any set of ciphertexts are possible. The novelty is that one can aggregate any set of secret keys and make them as compact as a single key, but encompassing the power of all the keys being aggregated. In other words, the secret key holder can release a constant-size aggregate key for flexible choices of ciphertext set in cloud storage, but the other encrypted files outside the set remain confidential. This compact aggregate key can be conveniently sent to others or be stored in a smart card with very limited secure storage. We provide formal security analysis of our schemes in the standard model. We also describe other application of our schemes. In particular, our schemes give the first public-key patient-controlled encryption for flexible hierarchy, which was yet to be known.
机译:数据共享是云存储中的重要功能。在本文中,我们展示了如何安全,高效和灵活地与云存储中的其他人共享数据。我们描述了产生恒定大小密文的新的公共密钥密码系统,从而可以有效地委派任何一组密文的解密权。新颖之处在于,它可以聚合任何一组秘密密钥,并使它们像单个密钥一样紧凑,但包含所有被聚合密钥的功能。换句话说,秘密密钥持有者可以释放一个恒定大小的聚合密钥,以便灵活选择云存储中的密文集,但是该集之外的其他加密文件仍然是机密的。这种紧凑的聚合密钥可以方便地发送给其他人,也可以存储在安全存储非常有限的智能卡中。我们在标准模型中提供对我们方案的正式安全性分析。我们还将描述方案的其他应用。尤其是,我们的方案为灵活的层次结构提供了第一个由患者控制的公用密钥加密方法,目前尚不知道。

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