It can provide effective protection for digital media forgery, falsification, authentication, security and intactness by embedding a special mark (digital watermark) into the multimedia data.

它主要通过在媒体信息中嵌入标记信号(数字水印)，为媒体信息在防伪、防篡改、认证、保障数据安全和完整性等方面提供有效的技术手段。

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Hash Marking method was proposed to mark the mobile node and to ensure the security of authorization. In addition, pre-authentication method was used to reduce hand-off time.

为了保证授权过程的安全，设计了一种散列码标识的方案，作为接入点识别移动台的根据，同时采用提前认证等手段提高切换过程的速度。

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The biggest question mark from potential buyers has been the lack of a certificate of authentication.

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