Registration-Based Encryption: Removing Private-Key Generator from IBE
Registration-Based Encryption: Removing Private-Key Generator from IBE
复制标题
基于注册的加密：从 IBE 中删除私钥生成器
DOI：
10.1007/978-3-030-03807-6_25
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Ahmadreza Rahimi
中科院分区：
文献类型：
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作者：
Sanjam Garg;Mohammad Hajiabadi;Mohammad Mahmoody;Ahmadreza Rahimi
在这项工作中，我们引入了基于注册的加密(简称RBE)的概念，目的是消除IBE方案中需要放置在私钥生成器中的信任方。在RBE方案中，用户对自己的公钥和私钥进行采样。还将有一个“密钥管理员”，其工作只是汇总所有注册用户的公共密钥，并在新用户加入系统时更新“短”公共参数。仍然可以使用接收者的身份和在接收者注册之后发布的任何公共参数对特定接收者执行加密。解密需要一些将用户的公钥(和私钥)连接到公共参数的辅助信息。正因为如此，随着公共参数的更新，解密者可能需要获取用于解密的“几个”附加辅助信息。更正式地说，如果n是身份总数，而\(mathrm{\kappa}\)是安全参数，则需要满足以下条件。
In this work, we introduce the notion of registration-based encryption (RBE for short) with the goal of removing the trust parties need to place in the private-key generator in an IBE scheme. In an RBE scheme, users sample their own public and secret keys. There will also be a “key curator” whose job is only to aggregate the public keys of all the registered users and update the “short” public parameter whenever a new user joins the system. Encryption can still be performed to a particular recipient using the recipient’s identity and any public parameters released subsequent to the recipient’s registration. Decryption requires some auxiliary information connecting users’ public (and secret) keys to the public parameters. Because of this, as the public parameters get updated, a decryptor may need to obtain “a few” additional auxiliary information for decryption. More formally, if n is the total number of identities and \(\mathrm {\kappa }\) is the security parameter, we require the following.