A multiple semi-fragile watermarks algorithms was proposed

considering the characteristics of clustering col-laboration aggregation in WSN.The generation of watermarks

embeding and extraction were completed by not a single node

but a fixed number of witnesses nodes which selected within the same clusters.This algorithm could against leak-age of keys when a single node was captured

and it could save energy costs also.On this basis

a false data filtering al-gorithm was proposed based on multiple semi-fragile watermarks

this algorithm could authenticate the accuracy

com-pleteness and fresh using watermarks embedded in data

without relying on MAC authentication.It provided a compari-son between the scheme and previously proposed schemes.The analysis and simulation results indicate significant im-provement in probability of filtering false data

energy saving and having robust

yet fragile characteristics

which support lossy in-network data processing and resist of the noise in certain.