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Sensor network is one of the authoritative leading technology of current century. Security is the main concern for everything whether it is for wired based networks or wireless based networks. So far, many of the researches have thought to physically implement the sensor nodes and sensor networks for secure communications but they did not think over it for security perspective. Sensor network works in very resource constraint environment. Due to these security reasons, we present various protocols to provide the basic needs of data security that are: confidentiality, authentication, freshness and authenticated broadcasting because this broadcasting requires some techniques or protocols to securely communicate with other sensor node(s). Other issues in sensor networks are power management, computation overhead and low memory capacity.