针对数字水印方案中时间戳协议存在的弊端，结合位承诺协议对其进行改进。
This paper analyzes the shortcomings in the existing time stamp scheme and makes some improvement combined with bit commitment.
然后其他机器就可以使用网络时间协议(ntp)来与时间服务器的时间戳进行同步。
The other machines would then use the network time protocol (NTP) to synchronize their time stamps with the time server's.
该协议引入数字证书，将数字签名、时间戳和水印信息一起嵌入到数字图像中。
The new protocol imports certificate, and embeds signature, timestamp, watermarking information into digital image.
实验结果表明，该协议能避免单纯采用时间戳所带来的时钟同步问题，具有较好的抗重放攻击能力。
Experimental results show that, this protocol can effectively avoid the problem of clock synchronization when only use timestamp, and good anti-replay attack capacity.
实验结果表明，该协议能避免单纯采用时间戳所带来的时钟同步问题，具有较好的抗重放攻击能力。
Experimental results show that, this protocol can effectively avoid the problem of clock synchronization when only use timestamp, and good anti-replay attack capacity.
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