中文摘要：

针对具有前向安全性和可公开验证的签密方案进行研究，基于Liber和Quisquater的签密方案，给出了一个新的签密方案，并对所提出方案的安全性和效率进行了分析。结果表明：文章给出的签密方案实现了同时提供前向安全性和可公开验证性；而基于身份公钥密码和双线性对技术，使该方案又具有密钥长度短和密钥管理简单的特点，使其具有与LQ签密方案相当的效率。这种高效性和高安全性签密方案的提出，不仅对相关公开问题的解决具有一定理论意义，同时文中签密方案能更好的满足电子商务等实际应用的高安全需求，因此也具有一定应用价值。

英文摘要：

In this paper, by conducting an investigation in signcryption schemes with forward security and public verifiability and based on Liber and Quisquaters signcryption schemes, a new signcryption scheme is proposed, and its security and efficiency are analyzed at the same time. The result shows that the new signcryption scheme pro- posed can provide forward security and public verifiability simultaneously; moreover, it has the property of shorter length of parameter key and simple management is simple compared with the traditional PKI owing to the use of Id - based PKC and bilinear pairing technique in the scheme ; therefore, it has the same efficiency with the LQ signcryption scheme. This work of giving such an efficient and secure signcryption scheme is not only significant in theory in solving the related public problem but also has practical value for the high level requirement of practical application such as the electronic business.