The onion router allows hiding the user's identity. Various software are under this categories are available that allows online anonymity. It doesn't allow network surveillance or traffic analysis to get tracked. But most these software used equal sized cells (512B).In this paper, the authors are analyzing cells counting attacks against Tor which allows identify anonymous communication among user. They need to buy one onion router then attacker can include special signal l i.e. cell counting attack into network traffic. They have developed this system against Tor and experimental results show the effectiveness of algorithms and allow detecting Tor network.