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In this paper, we quantify the performance analysis of PingPong-128 keystream generator for wireless sensor networks. Although, PingPong-128 is not a standard stream cipher but still PingPong-128 keystream generator is an idea for resource constrained WSNs and can be widely used in the applications of secure communication, where the communication nodes have limited computation processing and storage capabilities while requiring sufficient levels of security. We present a performance comparison of PingPong-128 with other stream ciphers selected in European Project Ecrypt called eSTREAM project, namely Dragon, HC-128, and Rabbit. Apart from that, we are also considering RC-4 stream ciphers for comparison with pingpong-128 for wireless sensor networks.