论文标题
基于晶格的公共密钥加密和平等测试支持标准模型中的灵活授权
Lattice-based public key encryption with equality test supporting flexible authorization in standard model
论文作者
论文摘要
使用平等测试（PKEET）的公共密钥加密支持检查是否在不同的公共钥匙下加密的两个密文是否包含相同的消息。 Pkeet有许多有趣的应用程序，例如在加密数据上进行关键字搜索，加密数据分配，以进行有效的加密数据管理，个人健康记录系统，加密电子邮件系统中的垃圾邮件过滤等。但是，Pkeet方案缺乏用户控制其密文与他人的比较的授权机制。在2015年，MA等人。通过灵活的授权（Pkeet-FA）介绍Pkeet的概念，从而加强隐私保护。自2015年以来，Pkeet-Fa上有几项后续作品。但是，在随机轨道模型中，所有这些都是安全的。而且，所有这些都容易受到量子攻击的影响。在本文中，我们在标准模型中提供了三种量子安全pkeet-fa的结构。根据整数晶格和理想晶格的硬度假设，建议的结构是安全的。最后，我们在理想的晶格上实施了Pkeet-FA计划。
Public key encryption with equality test (PKEET) supports to check whether two ciphertexts encrypted under different public keys contain the same message or not. PKEET has many interesting applications such as keyword search on encrypted data, encrypted data partitioning for efficient encrypted data management, personal health record systems, spam filtering in encrypted email systems and so on. However, the PKEET scheme lacks an authorization mechanism for a user to control the comparison of its ciphertexts with others. In 2015, Ma et al. introduce the notion of PKEET with flexible authorization (PKEET-FA) which strengthens privacy protection. Since 2015, there are several follow-up works on PKEET-FA. But, all are secure in the random-oracle model. Moreover, all are vulnerable to quantum attacks. In this paper, we provide three constructions of quantum-safe PKEET-FA secure in the standard model. Proposed constructions are secure based on the hardness assumptions of integer lattices and ideal lattices. Finally, we implement the PKEET-FA scheme over ideal lattices.
