Make sure you are using a secure site while making payments through the Internet. Look for a lock icon in the status bar of your web browser. This icon indicates that a site is employing an encryption technology during the transmission of your sensitive data.
Never respond to phishing e-mails that falsely claim to be from a bank and ask you to disclose your personal and bank related confidential details. ICICI Bank will never ask you to send your personal banking details
Get yourself enrolled for 3D Secure (Verified by Visa (VbV)/ MasterCard SecureCode (MCSC)). This is now mandatory for carrying out online transactions.
Avoid accessing your Internet banking account on unsecure public computers (e.g. internet cafes)
Once you have completeed your online banking transactions, remember to log-off by clicking on the "log-off" option. Close your browser and lock your computer if it is left idle.