In this paper, we overview the current state-of-the-art and future trends in network security and argue that the security requirements of electronic commerce (e-commerce) applications generally go beyond the more traditional requirements of network security. This is particularly true for the requirements that address the complexity and availability of cryptographic applications, the anonymity of participating peers, the autonomy of mobile code, the manageability of trust, and the necessity for intellectual property protection. Based on these additional requirements, we point out some areas for further study and propose a corresponding research agenda for security in ecommerce.