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Confidentiality is the term used to prevent the disclosure of information to unauthorized individuals or systems. Breaches of confidentiality take many forms. Permitting someone to look over your shoulder at your computer screen while you have confidential data displayed on it could be a breach of confidentiality. If a laptop computer containing sensitive information about a company's employees is stolen or sold, it could result in a breach of confidentiality. Giving out confidential information over the telephone is a breach of confidentiality if the caller is not authorized to have the information.

Data leakage has been one of the most important concerns for many big companies since this problem could bring enormous loss to the company. In this information technology era, data security has become significantly essential and useful yet difficult task since technology is evolving so fast everyday or even minute. Electronic commerce is popular all over the world, however, people face a lot of security problems when they perform the transaction through the web site. Calder [1] mentioned that the standard (ISO/IEC27001:2005) can enable organizations throughout the world to ensure that they are applying information security best practice in their organizations.