Abstract. Two methods to implement privacy in network communication, anonymity and DCSC (data confidentiality and secure computation) are analysed and compared in regard to privacy in mobile agent applications. It is illustrated that privacy through DCSC is more suitable in mobile agent applications. To support this conclusion, privacy is concretely implemented in a bidding mobile agent scheme in this paper. Success of this example demonstrates that privacy can be practically achieved in mobile agent applications through DCSC without compromising the advantage of mobile agent.