In this paper,we show how to use the dual techniques in the subgroups to give a secure identity-based broadcast encryption(IBBE) scheme with constant-size ciphertexts. Our scheme achieves the full security(adaptive se...In this paper,we show how to use the dual techniques in the subgroups to give a secure identity-based broadcast encryption(IBBE) scheme with constant-size ciphertexts. Our scheme achieves the full security(adaptive security) under three static(i.e. non q-based) assumptions. It is worth noting that only recently Waters gives a short ciphertext broadcast encryption system that is even adaptively secure under the simple assumptions. One feature of our methodology is that it is relatively simple to leverage our techniques to get adaptive security.展开更多
为了满足电子交易中电子文档的可用性、安全性、权威性,提出了一种基于IBE(Identity Based Encryp-tion)技术和数字水印技术的电子印章解决方案。该方案使用IBE技术分配成对的密钥完成水印的嵌入和提取验证。在保证与基于PKI(Public Key...为了满足电子交易中电子文档的可用性、安全性、权威性,提出了一种基于IBE(Identity Based Encryp-tion)技术和数字水印技术的电子印章解决方案。该方案使用IBE技术分配成对的密钥完成水印的嵌入和提取验证。在保证与基于PKI(Public Key Infrastructure)技术的印章系统具有等同安全强度的同时,具有降低成本、提高效率的优点。展开更多
针对简单的密钥共享方案并不适用于群组成员动态更新的情况,以及现今标准应用无法有效地支持群组加密的问题,研究一个基于身份加密(identity based encryption, IBE)的群组密码系统,该系统主要包括标识与群组管理系统、支持群组加密的IB...针对简单的密钥共享方案并不适用于群组成员动态更新的情况,以及现今标准应用无法有效地支持群组加密的问题,研究一个基于身份加密(identity based encryption, IBE)的群组密码系统,该系统主要包括标识与群组管理系统、支持群组加密的IBE加密服务提供程序(cryptographic service provider, CSP)、密码服务器三大模块.用户可以在标识与群组管理系统上注册安全的个人和群组标识以及注销泄露的私钥所对应的不可用标识,同时用户可以创建、加入、退出、管理、解散群组等.支持群组加密的IBE CSP和密码服务器均支持群组加解密以及群组共享密钥自动更新的功能,2种解密方式互相兼容,用户可以自行选择.由于大多标准应用并不支持IBE算法,且IBE没有类似证书吊销功能来应对密钥泄露的情况.设计伪RSA数字证书,将该群组密码系统成功应用到标准应用Exchange中,并对群组标识加上时间策略和索引策略,形成拓展群组标识来更新、恢复或者销毁密钥,可以适用于群组成员动态更新的情况.展开更多
A biometric identity-based signcryption scheme is presented, which combines signature and encryption. In the proposed scheme, biometric information is used to construct the private key to ensure uniqueness, and a user...A biometric identity-based signcryption scheme is presented, which combines signature and encryption. In the proposed scheme, biometric information is used to construct the private key to ensure uniqueness, and a user＇s identity is the corresponding public key to make the message transfer non-interactive. The proposed scheme is shown to provide confidentiality and unforgeability in the random oracle model展开更多
基金supported by the Nature Science Foundation of China under grant 60970119, 60803149the National Basic Research Program of China(973) under grant 2007CB311201
文摘In this paper,we show how to use the dual techniques in the subgroups to give a secure identity-based broadcast encryption(IBBE) scheme with constant-size ciphertexts. Our scheme achieves the full security(adaptive security) under three static(i.e. non q-based) assumptions. It is worth noting that only recently Waters gives a short ciphertext broadcast encryption system that is even adaptively secure under the simple assumptions. One feature of our methodology is that it is relatively simple to leverage our techniques to get adaptive security.
文摘为了满足电子交易中电子文档的可用性、安全性、权威性,提出了一种基于IBE(Identity Based Encryp-tion)技术和数字水印技术的电子印章解决方案。该方案使用IBE技术分配成对的密钥完成水印的嵌入和提取验证。在保证与基于PKI(Public Key Infrastructure)技术的印章系统具有等同安全强度的同时,具有降低成本、提高效率的优点。
文摘针对简单的密钥共享方案并不适用于群组成员动态更新的情况,以及现今标准应用无法有效地支持群组加密的问题,研究一个基于身份加密(identity based encryption, IBE)的群组密码系统,该系统主要包括标识与群组管理系统、支持群组加密的IBE加密服务提供程序(cryptographic service provider, CSP)、密码服务器三大模块.用户可以在标识与群组管理系统上注册安全的个人和群组标识以及注销泄露的私钥所对应的不可用标识,同时用户可以创建、加入、退出、管理、解散群组等.支持群组加密的IBE CSP和密码服务器均支持群组加解密以及群组共享密钥自动更新的功能,2种解密方式互相兼容,用户可以自行选择.由于大多标准应用并不支持IBE算法,且IBE没有类似证书吊销功能来应对密钥泄露的情况.设计伪RSA数字证书,将该群组密码系统成功应用到标准应用Exchange中,并对群组标识加上时间策略和索引策略,形成拓展群组标识来更新、恢复或者销毁密钥,可以适用于群组成员动态更新的情况.
基金supported in part by National Science Council under the Grant No.NSC 99-2410-H-025-010-MY2 and NSC 101-2410-H-025-009-MY2
文摘A biometric identity-based signcryption scheme is presented, which combines signature and encryption. In the proposed scheme, biometric information is used to construct the private key to ensure uniqueness, and a user＇s identity is the corresponding public key to make the message transfer non-interactive. The proposed scheme is shown to provide confidentiality and unforgeability in the random oracle model
