The most appropriate control to prevent unauthorized retrieval of confidential information stored in a business application system is to enforce an internal data access policy. A data access policy defines who can access what data, under what conditions and for what purposes. It also specifies the roles and responsibilities of data owners, custodians and users, as well as the security measures and controls to protect data confidentiality, integrity and availability. By enforcing a data access policy, the organization can ensure that only authorized personnel can retrieve confidential informationfrom the business application system. Applying single sign-on for access control, implementing segregation of duties and enforcing the use of digital signatures are also useful controls, but they are not sufficient to prevent unauthorized data retrieval without a clear and comprehensive data access policy. References:

CISA Review Manual, 27th Edition, page 2301

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