Abstract: To achieve a more comprehensive and sustained privacy control and tamper detection for the data in wireless sensor networks, we propose a novel multiple watermarking method, called Multi-mark, which consists of an annotation part and a fragile part. On the one hand, encrypted user’s personal information is embedded into the routine monitoring data, as annotation watermark, which can be extracted when, needed. On the other hand, tampering is detected using fragile watermark. The former can resist various manipulative attacks, while the latter can detect any malicious modifications. Multi-mark not only provides privacy and security, but also saves data transmission amount and storage space. The experimental results show that Multi-mark can reduce 30% of data traffic and only introduces very low computation cost. Multi-mark is a network structure-free scheme, which can be easily and efficiently applied to the resource limited sensor networks.