Big data is a collection of very large and complex set of data which is remote away from the capacity of the existing database management tools or traditional data processing applications. The data includes private and sensitive information that need to be kept secure and safe. Numerous security information and event management tools were designed to protect and manage unstructured data. In this paper hash and PSO based security system is proposed for security of Big Data. The hash features are

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... extracted in the spatial domain of the image through PSO to generate the image hash. The extracted hash is encrypted to maintain the secrecy.