摘要： 提出一个基于身份和密钥封装机制的加密方案，采用对称加密技术实现信息的高效加密解密，利用基于身份的密码算法传递对称密钥。该方案扩展了标准模型下可证明安全的选择密文攻击的加密方案，其安全性规约为判定性Diffie-Hellman假设。分析结果表明，该方案对抵抗自适应选择密文攻击是不可区分的。

关键词: 基于身份的加密, 标准模型, 密钥封装机制, 双线性对, DDH问题, 选择密文攻击

Abstract: This paper proposes a new Identity-based and Key Encapsulation Mechanism(IB-KEM) encryption scheme. The symmetric encryption scheme is used to encryption and description for message, and the identity-based encryption scheme is used to manage the symmetric encryption key. The new scheme is a natural extension of the encryption scheme which is provably secure under chosen ciphertext attack in the standard model. The security of the new scheme is under Decisional Diffie-Hellman(DDH) assumption. The security analysis shows that the new scheme is indistinguishable under adaptive chosen ciphertext attack.

Key words: identity-based encryption, standard model, key encapsulation mechanism, bilinear pairing, DDH problem, chosen ciphertext attack

中图分类号: 

• TP393