With the rapid development of the networks, security problems of networks are getting more and more important. For e-commerce has been widely used in banks, which is one of the key department of national economy, networks security of the bank is becoming a serious and great research subject which people have to face. In this paper, based on the existing net-bank system, and from the viewpoint of promoting networks security, realizing low-cost running, and providing easy interface for customers, a whole set of scheme for net-bank has been presented and realized, which is based on fingerprint identification online, and has combined the fingerprint identification algorithm, encryption algorithm, and the real trading system of net-bank. The advantages are as follows: a new-developed method of fingerprint identification is used; it is the first time in China to combine fingerprint identification algorithm with net-bank truly in use, which can substitute traditional person identification way by cipher, without the shortcoming of low-security and being easily forgotten. At the other hand, it is corresponding to the existing system very well. In this paper, security problems inside the networks of the banks are also studied, which is relative to the subject upwards. Technique combined firewall and intrusion detection system is presented. This paper also gives our own algorithms about misuse detection and anomaly detection, which are the two main methods of intrusion detection. And further more, it gives detailing theoretical descriptions to those hacker's techniques to intrude bank networks, with the methods of defense and fighting-back. At last, based on the theoretical system upwards, in this paper there is a proto type of intrusion detection system realized and showed out. It can help nowadays firewall products detect most of known intrusions and some unknown intrusions to bank network, and satisfy the demand of networks security of the banks.
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