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Deployments in hostile & unattended environments and non-replenishable energy supply have influenced the protocol design in wireless sensor networks. In-network processing of sensor readings helps in reducing the redundant reverse multicast traffic, communicated from leaf nodes to the base station. However, hostile deployments and in-network processing of sensor readings have raised security concerns. The present work explores different malleable cryptosystems (or homomorphic cryptosystems) used in wireless sensor networks to ensure the privacy and confidentiality of sensor readings at vulnerable intermediate nodes. As per our knowledge, the comprehensive discussion of malleable cryptosystems, presented in this chapter, increases the applicability of these cryptosystems in Wireless Sensor Networks as well as in other research areas such as Internet of Things, Network Coding, and Cloud …