抗密钥泄露的在线/离线身份基加密机制

目前已有的在线离线身份基加密（IBOOE）方案无法抵抗边信道攻击，引起密码系统秘密信息泄露问题。新方案通过将随机提取器嵌入在线加密算法来隐藏私钥泄露和密文之间的关系，提出首个有界泄露模型下安全的IBOOE方案；新方案基于合数阶双线性群上的三个静态假设，利用双系统加密技术在标准模型下抵抗选择明文攻击达到完全安全性和泄露弹性。此外，与传统的IBOOE方案相比较，新方案特别适用于敏感数据存储且资源受限的场景。

Identity-based online/offline encryption resistant to key leakage

The exist Identity-based online/offline encryption(IBOOE) systems can''t resilient to side channel attack, it will lead to secret information leakage problem of cryptosystem. This paper embedded random extractor to online encryption procedure to mask the relationship between the leakage of secret key and the ciphertext. It firstly put forward a bound leakage IBOOE scheme. The proposed scheme employed dual system encryption to prove fully security and chosen plaintext security against key leakage attack in the standard model from three static assumptions on composite order bilinear groups. In addition, compared with the traditional IBOOE scheme, the proposed scheme is extremely suitable for the scenarios where store sensitive data and resource-constrained.