项目名称: 标准模型下公钥加密的选择密文安全性研究
项目编号: No.61272534
项目类型: 面上项目
立项/批准年度: 2013
项目学科: 自动化技术、计算机技术
项目作者: 梅其祥
作者单位: 广东海洋大学
项目金额: 80万元
中文摘要: 选择密文安全性是公钥加密中最重要的概念之一。本项目旨在寻找标准模型下选择密文安全的公钥加密的新方案、新方法。我们将对传统的选择密文安全(即在选择密文攻击下具有不可区分安全性)的公钥加密进行研究,侧重于构造效率更高、假设更弱下的方案以及对一些重要的框架进一步推广。我们还将对选择密文安全的门限公钥加密(此时,n个中的t个服务器合作才能解密)进行研究,侧重于构造标准模型下不需要pairing的非交互方案。 此外,我们还研究选择密文安全的选择性公开公钥加密(这种情形下,攻击者不仅可以得到一些适应性选取的密文的解密,还可以得到一些选择性密文的随机数),我们将侧重于研究如何在较弱的标准假设下构造高效的这种情形下的方案。
中文关键词: 选择密文安全;加密;标准模型;;
英文摘要: Chosen ciphertext (CCA) security is one of the most important notions in the public key encryption. The goal of this project is aim at finding new schemes and new techniques for chosen ciphertext secure public key encryption in the standard model. We will study the CCA encryption in the traditional sense, i.e., indistinguishability against adaptive chosen ciphertext attacks, focusing on constructing more efficient schemes, proving the security under weaker assumptions and extending the scope of some important frameworks. We will also study CCA secure threshold encryption, where t out of n servers are needed to decrypt the ciphertext, attempting to construct chosen ciphertext secure non-interactive threshold encryption schemes without pairing in the standard models. Besides, we will study CCA secure encryption in the setting of selective opening, where the adversary can not only see the decryption of some adaptive chosen ciphertext, but also can see the randomness of some selective ciphertexts. We will try to construct more efficient SO-CCA secure schemes under weaker assumptions in the standard model.
英文关键词: Chosen ciphertext security;encryption;standard model;;