共查询到19条相似文献,搜索用时 156 毫秒
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群组密钥协商是群组通信中非常重要的基本工具,现有群组密钥协商机制需要本地组成员全部参与协商,这严重制约群组通信系统的可扩展性与高效性。针对这个问题,文中提出了一种基于服务器端的群组密钥协商方案。该方案仅需要与每个组成员连接的服务器组间密钥协商,从而能够降低群组的存储开销和通信开销。同时在客户端函数库内通过设计一个单向映射机制实现从服务器组密钥到群组密钥变换。与基于客户端函数库的密钥协商机制相比,其可扩展性及密钥协商效率更高。 相似文献
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研究了同构网络模型的组密钥管理问题,首次给出了一个明确的、更完整的动态组密钥管理模型,并提出了一种基于多个对称多项式的动态组密钥管理方案。该方案能够为任意多于2个且不大于节点总数的节点组成的动态多播组提供密钥管理功能,解决了多播组建立、节点加入、退出等所引发的与组密钥相关的问题。该方案支持节点移动,具有可扩展性,并很好地解决了密钥更新过程中多播通信的不可靠性。组成员节点通过计算获得组密钥,只需要少量的无线通信开销,大大降低了协商组密钥的代价。分析比较认为,方案在存储、计算和通信开销方面具有很好的性能,更适用于资源受限的无线传感器网络。 相似文献
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无线传感器网络中自治愈的群组密钥管理方案 总被引:3,自引:1,他引:2
群组密钥管理的自治愈机制是保证无线传感器网络在不可靠信道上进行安全群组通信的重要 手段.基于采用双方向密钥链的群组密钥分发与撤销方法,提出了一个无线传感器网络中具有撤销能力的自治愈群组密钥管理方案.该方案实现了群组密钥的自治愈功能和节点撤销能力, 能够满足在较高丢包率的无线通信环境下传感器网络群组密钥管理的安全需求,确保了群组密钥保密性、前向保密性和后向保密性等安全属性.性能分析表明,该方案具有较小的计算和通信开销,能够适用于无线传感器网络. 相似文献
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在无线传感器网络中,节点被敌方捕获以后将泄露节点内存储的群组密钥等秘密信息,所以需要建立一种安全高效的群组密钥管理系统来及时对被捕获节点进行撤销,以保证无线传感器网络中群组通信的安全.提出一种基于逻辑密钥树结构的密钥预分配方案,群组控制者和密钥服务器(GCKS)为逻辑密钥树中每一逻辑节点分配一个密钥集,每一sensor节点对应一个叶节点,以及一条从该叶节点到根节点的路径,GCKS将该路径上所有节点的密钥植入sensor节点.节点撤销时,GCKS将逻辑密钥树分成互不相连的子树,利用子树中sensor节点的共享密钥进行群组密钥的更新.分析表明本方案满足无状态性,以及正确性、群组密钥保密性、前向保密性和后向保密性等安全性质,具有较低的存储、通信和计算开销,适用于无线传感器网络环境. 相似文献
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一种新的基于身份的安全组播密钥协商方案 总被引:1,自引:0,他引:1
密钥管理是安全组播的难点。该文提出了一个新的基于身份的密钥协商方案,并具体地分析了子组之间的通信过程,以及组成员动态变化时密钥的更新过程。结果表明该方案满足密钥协商安全性要求,且在降低计算和通信代价方面取得了较好的效果。 相似文献
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针对移动自组网中组密钥管理面临的诸多挑战,提出一种高效的安全簇组密钥协商协议(ESGKAP,effi-cient and secure group key agreement protocol).ESGKAP基于提出的高性能层簇式CCQ_n网络模型,有效地减少了组密钥协商过程中的秘密贡献交互开销,增加了协议的灵活性、可扩展性和容错性.ESGKAP无需控制中心,由秘密分发中心构造门限秘密共享,所有成员通过协商生成簇组密钥,提高了方案的安全性,且基于ECC密码体制提高了簇组密钥生成的效率.同时,提出高效的签密及门限联合签名方案,确保簇组成员能够对接收的簇组密钥份额进行验证,进一步增加了方案的安全性.使用串空间模型对ESGKAP方案进行了形式化分析,证明了其正确性和安全性.最后,通过与BD、A-GDH和TGDH协议比较,表明ESGKAP能有效减少节点和网络资源消耗,很好地适用于特定的移动自组网环境,具有更为明显的安全和性能优势. 相似文献
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In view of high efficiency and security requirements in WSN encryption algorithm,a lightweight chaotic block encryption algorithm was designed and a novel scheme of dynamic sub keys extension was proposed.To greatly reduce the computing burden of WSN nodes,this scheme made full use of WSN cloud servers monitoring platform,which was powerful in data computing and processing,and transfered the sub keys synchronization task from nodes to cloud servers.Experimental results and performance analysis show that the scheme has good characteristics of diffusion,confusion and statistical balance,strong key security and high algorithm efficiency.It has a good application prospect in the field of WSN communication encryption. 相似文献
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Melisa Hajyvahabzadeh Elina Eidkhani Seyedeh Anahita Mortazavi Alireza Nemaney?Pour 《Telecommunication Systems》2012,51(2-3):115-123
This paper presents a new group key management protocol, CKC (Code for Key Calculation) for secure IP multicast. In this protocol which is based on logical key hierarchy, only the group key needs to be sent to new member at join. Then, using the group key current members and the new member calculate the necessary keys by node codes and one-way hash function. A?node code is a random number assigned to each node to help users calculate necessary keys. Again, at leave server just sends the new group key to the remaining members. By this key, members calculate necessary keys using node codes and one-way hash function. The security of the keys is based on one-wayness of hash function. The results show that CKC reduces computational and communication overhead, and message size largely at join without increasing them at leave. 相似文献
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SK Hafizul Islam 《Wireless Personal Communications》2014,79(3):1975-1991
In mobile multi-server authentication, a client can access different servers over an insecure channel like Internet and wireless networks for numerous online applications. In the literature, several multi-server authentication schemes for mobile clients have been devised. However, most of them are insecure against ephemeral secret leakage (ESL) attack and other vulnerabilities. For mutual authentication and key agreement, mobile client and server used ephemeral secrets (random numbers) and leakage of these secrets may be possible in practice. Since these are generated by an external source that may be controlled by an adversary. Also they are generally pre-computed and stored in insecure devices. Thus, if the secrets are leaked then the session key would turn out to be known and the private keys of client and server may be compromised from the eavesdropped messages. This phenomenon is called ESL attack. To defeat the weaknesses, in this paper, we design an ESL attack-free identity-based mutual authentication and key agreement scheme for mobile multi-server environment. The proposed scheme is analyzed and proven to be provably secure in the random oracle model under the Computational Diffie–Hellman assumption. 相似文献
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To solve the problem of the access keys stored in a smart card increasing linearly with the number of registered clouds without third party participated in authentication,an authentication scheme was proposed for multi-cloud environment based on smart card.In the proposed scheme,the authentication was realized between user and multiple clouds without third party participation when the smart card only stored two access key.Thus the storage cost of smart card was reduced effectively.Because there was no public key cryptography,the authentication messages was generated by using XOR homomorphic function and Hash function,thus the computational cost of the smart card and the cloud servers was reduced effectively.Moreover,the proposed scheme also didn’t need to store any user’s information on the cloud servers,thereby reducing the storage and management costs of the cloud servers.The security analysis and the performance analysis show that the proposed scheme is able to resist multiple attacks,which is secure and efficient. 相似文献
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With the rapid development of quantum theory and the existence of polynomial algorithm in quantum computation based on discrete logarithm problem and large integer decomposition problem,the security of the algorithm was seriously threatened.Therefore,two authentication key agreement protocols were proposed rely on ring-learning-with-error (RLWE) assumption including lattice-based implicit authentication key agreement scheme and lattice-based explicit authentication key agreement scheme and proved its security.The implicit authentication key agreement protocol is less to communicate and faster to authentication,the explicit authentication key agreement protocol is more to secure.At the same time,bidirectional authentication of users and servers can resist unpredictable online dictionary attacks.The new protocol has higher efficiency and shorter key length than other password authentication key agreement protocols.It can resist quantum attacks.Therefore,the protocol is efficient,secure,and suitable for large-scale network communication. 相似文献
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Jian Zhou Meina Song Junde Song Xian-wei Zhou Liyan Sun 《Wireless Personal Communications》2014,77(1):269-287
In deep space delay tolerant networks rekeying expend vast amounts of energy and delay time as a reliable end-to-end communication is very difficult to be available between members and key management center. In order to deal with the question, this paper puts forwards an autonomic group key management scheme for deep space DTN, in which a logical key tree based on one-encryption-key multi-decryption-key key protocol is presented. Each leaf node with a secret decryption key corresponds to a network member and each non-leaf node corresponds to a public encryption key generated by all leaf node’s decryption keys that belong to the non-leaf node’s sub tree. In the proposed scheme, each legitimate member has the same capability of modifying public encryption key with himself decryption key as key management center, so rekeying can be fulfilled successfully by a local leaving or joining member in lack of key management center support. In the security aspect, forward security and backward security are guaranteed. In the efficiency aspect, our proposed scheme’s rekeying message cost is half of LKH scheme when a new member joins, furthermore in member leaving event a leaving member makes tradeoff between computation cost and message cost except for rekeying message cost is constant and is not related to network scale. Therefore, our proposed scheme is more suitable for deep space DTN than LKH and the localization of rekeying is realized securely. 相似文献
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To provide mutual authentication and communication confidentiality between mobile clients and servers, numerous identity‐based authenticated key agreement (ID‐AKA) protocols were proposed to authenticate each other while constructing a common session key. In most of the existing ID‐AKA protocols, ephemeral secrets (random values) are involved in the computations of the common session key between mobile client and server. Thus, these ID‐AKA protocols might become vulnerable because of the ephemeral‐secret‐leakage (ESL) attacks in the sense that if the involved ephemeral secrets are compromised, an adversary could compute session keys and reveal the private keys of participants in an AKA protocol. Very recently, 2 ID‐AKA protocols were proposed to withstand the ESL attacks. One of them is suitable for single server environment and requires no pairing operations on the mobile client side. The other one fits multi‐server environments, but requires 2 expensive pairing operations. In this article, we present a strongly secure ID‐AKA protocol resisting ESL attacks under mobile multi‐server environments. By performance analysis and comparisons, we demonstrate that our protocol requires the lowest communication overhead, does not require any pairing operations, and is well suitable for mobile devices with limited computing capability. For security analysis, our protocol is provably secure under the computational Diffie‐Hellman assumption in the random oracle model. 相似文献