Topics in network security and data security

该提案包括网络安全和数据安全方面的几个选定的重要研究课题。网络安全的主题包括传感器网络安全密钥管理和层次访问控制。无线自组织传感器网络提供了某些民用应用，以及协助对潜在的恐怖主义威胁。在这些应用中，安全性是一个非常重要的问题。网络中的节点应该使用秘密密钥进行通信和认证。因此，如何在传感器网络中进行密钥分配是一个非常重要的问题。在这个建议中，我们将考虑一般的传感器网络的密钥方案，并考虑更具体的传感器网络的密钥管理方案，以适应各种真实的世界的应用。在组织层次结构中，较高级别的节点可以访问较低级别的节点，但不能访问相反级别的节点。在这种情况下，如何分发用于访问控制的密钥是一个挑战。我们将在这个提案中找到一个有效的方法来做到这一点。数据安全的主题包括数据库中的推理问题和数字指纹。为了简化问题，我们可以认为数据库中的推理问题意味着人们可以从公共数据库中推断出一些秘密信息。因此，我们需要方法来决定什么样的数据可以放入公共数据库。最近，我们提出了一些计划的推理问题，在一个单一的数据库。接下来，我们将考虑分布式数据库中的这些问题。数字文件，如软件、音乐、电影等，很容易复制和重新分发。数字版权管理（DRM）是一个新兴的领域，处理数字文件的版权保护。数字指纹用于防止所有权劫持和非法重新分配。密码学在这项研究中起着关键作用。在这个建议中，我们将进行进一步的调查，以找到更有效和更容易实施的方法。然后，我们将考虑一些特定的数字文件，如图像和音乐文件，并修改方法以适应特殊要求。本提案中的所有解决方案都将是明确的，易于实施。

This proposal includes several selected important research topics in network security and data security. Topics in network security consist of sensor network secure key management and access control in hierarchies. Wireless ad hoc sensor networks offer certain civilian applications as well as assisting against potential terrorist threats. Security is a very important issue in those applications. Nodes in a network should use secret keys for communication and authentication. So how to distribute keys in sensor networks is very important. In this proposal, we will consider secret key schemes for general sensor networks and  consider key management schemes for more specific sensor networks to fit various real world applications. In an organization hierarchy, a node at the higher level can access the node at the lower level, but not the inverse. How to distribute secret keys for access controls in that situation is a challenge. We willfind an efficient way to do that in this proposal. Topics for data security include inference problem in a database and digital fingerprinting. To simplify things, we may think that an inference problem in database means that one can infer some secret information from public databases. So we need methods to decide what kind data can be put in to public databases. Recently we proposed some schemes for inference problems in a single database. Next we will consider those problems in distributed databases. Digital files, such as software, music, movie, etc., are easy to copy and redistribute. Digital rights management(DRM) is an emerging area that deals with the copy right protection of digital files. Digital fingerprinting are used to protect against ownership hijacking and unlawful redistribution. Cryptography plays a key role in this research. In this proposal, we will undertake furtherinvestigation to find more efficient and easily implemented methods. We will then consider some specific digital files, such as image and music files, and modify the methods to fit the special requirements. All the solutions in this proposal will be explicit and easy to implement.