在安全性方面，新方案满足机密性、不可伪造性和可公开验证性。

For security requirements, this new scheme satisfies confidentiality, unforgeability and public verifiability.

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然而签密方案不能像传统方法那样同时提供前向安全性和可公开验证性。

But signcryption schemes cannot provide forward secrecy and public verifiability as the traditional method does.

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该方案实现了参与竞标公司身份的匿名性、中标者的不可否认性、可公开验证性等安全性问题。

This scheme realizes the anonymity of identity of bidders, unforgeability and public verifiability of successful bidders, etc.

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