Internet banking has gained wide acceptance internationally and seems to be fast catching up in India with more and more banks entering the fray. Online banking allows customers or users to conduct financial transactions on a secure website operated by their banks, credit unions or building societies. It can be accessed from anywhere that there is a computer with the Internet, and of course unlike bank branches the net is open 24 hours a day 7 days a week.In spite of the great benefits ,the number of malicious applications security problems (targeting) of online banking transactions has increased dramatically in recent years. This represents a challenge not only to the customers who use such facilities, but also to the institutions who offer them, as evidenced by an ongoing trail in the US[8]. For example, in 2008 ,England suffered online banking fraud losses that amounted to £53 million2, and the U.S. had hundreds of millions of dollars in fraud losses resulting from online attacks in 2009. According to the data compiled by the Reserve Bank of India (RBI), the money lost to such scams has doubled in the past four years. In the year 2009, banks lost Rs.2,289 crore (till December), while the loss was Rs.1,057 crore in 2007-08[ ].
So the safe and secure environment of computer technology is the most important concern for all financial service organizations. The responsibility of secure online banking is not only on the banks but also on the customers, because the customers, to operate the online banking, have to have a certain level of knowledge and technical competence and awareness[12]. This paper aims to explains about the reason behind the security breaches and the participation of both customers and the banks to enable the hackers or crackers to access others network. In spite of all these, the use of online banking is increasing and will be increasing in the future. The present study aims to find various types of flaws in the security of online banking that results in loss of money of my account holders along with leakage of their personal information to unauthorized persons. Security breaches are not only because of banks faults and banks inadequate polices but customers are equally responsible for it, because customers awareness regarding security is equally important .