本文提出了一类新的认证加密方案，这类方案首次将消息可恢复签名和对称加密有机结合。

A new type of authenticated encryption schemes is proposed. It first combines signature with message recovery schemes and symmetric encryption schemes together.

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论文提出了基于阴影提取、车辆纹理与灰度对称性相结合的车辆检测方案。

This thesis proposes a vehicle detection proposal based on the extraction of shadow with a combination of vehicles' texture and symmetry of gray-scale.

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该方案将对称加密算法、椭圆曲线公钥加密算法和单向函数有机结合，实现了用户使用权限和关键敏感字段的安全级别的关联。

Here we give a simpler implement, which encrypts the sensitive data at each level with a key unique to that level, whose security is based on elliptic curve discrete logarithm problem.

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