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Digital watermark is an active research area that hasreceived a considerable attentio i multimedia applications.For most watermark applications,it is ofte desired toretrieve the embedded information without access to thehost data,which is k ow as bli d watermark.Most ofprevious blind watermark schemes either suffersig ifica tly from host data i terference or requireexpense of storage.Therefore,simple and effective blindwatermark scheme is expected urgently.I this paper,we attempt to resolve the problems.Here,we presenttwo general blind watermark schemes,which is basedo lattice principle and property of periodic fu ctio ,respectively.By using these schemes,the host datainterference is eliminated entirely a d o ly a little ofcost of storage is needed.Thus,they have considerableadvantages over previously proposed schemes.