项目名称: 标准模型中匿名的基于身份加密方案研究
项目编号: No.61202367
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 计算机科学学科
项目作者: 任艳丽
作者单位: 上海大学
项目金额: 25万元
中文摘要: 保密通信通过不安全信道实现通信双方的数据共享,存在数据内容保密和用户隐私保护等安全问题。本项目考虑保密通信中的安全需求,研究匿名的基于身份加密方案,包括传统加密、广播加密、分级加密等,在实现数据保密的同时确保接收者的匿名性,并在标准模型中可证安全。主要研究内容有:构造素数阶群中的匿名加密方案,基于BDH假设在adaptive-ID模型中可证安全;提出匿名的广播加密方案,攻击者无法得到所有接收者的身份,任何接收者也不能得到其它接收者的身份;研究密文长度为常数的匿名分级加密方案,保护接收者的身份信息,并降低计算和通信代价;提出通用匿名的基于身份加密方案,发送者无需重新生成密文,任何可信用户可在非匿名的密文基础上进行计算,生成满足匿名性的密文。本项研究提出标准模型中的基于身份匿名加密方案,保护数据内容安全并避免用户身份信息泄露,对保密通信中个人隐私保护有重要意义和价值。
中文关键词: 匿名性;基于身份加密;广播加密;标准模型;
英文摘要: Secret communication can realize data sharing between sender and receiver through unsecure channel, but the security problems of data content confidentiality and user privacy preserving have to be solved properly. This project will consider the security requirements in secret communication environmrnt and study anonymous identity-based cryptosystems, including identity-based encryption (IBE), identity-based broadcast encryption (IBBE), and hierarchical IBE (HIBE) schemes. These schemes can realize receiver anonymity besides data confidentiality, and are provably secure without random oracles. The main research contents include constructing anonymous IBE schemes in prime order groups, which are adaptive-ID secure based on the BDH assumption; proposing anonymous IBBE schemes, where the attacker cannot obtain the identities of all receivers, and any receiver cannot get the identities of other receivers; studying anonymous HIBE schemes with constant size ciphertext, which can protect the identity information of the receiver and reduce the computation and communication costs; presenting universally anonymous IBE, IBBE, and HIBE schemes, where the sender does not need to send the ciphertext again and any trusted user can directly generate anonymous ciphertexts from the non-anonymous ones. The project will propose anon
英文关键词: anonymity;identity-based encryption;broadcast encryption;without random oracles;