How to Write an Information Security Policy
An Information Security Policy is the cornerstone of an Information Security Program. It should reflect the organization's objectives for security and the agreed upon management strategy for securing information.
Another reason that it is better to keep policy as a very small set of mandates to which everyone agrees is that, where people are aware that there are no exceptions to policy, they will generally be more willing to assist in getting it right up front to ensure that they will be able to comply going forward. Once a phrase such as "exceptions to this policy may be made by contacting the executive in charge of...." slips into the policy itself or the program in which it is used, the document becomes completely meaningless. It no longer represents management commitment to an Information Security Program, but instead communicates suspicion that the policy will not be workable. A security professional should consider that if such language were to make its way into a Human Resources or Accounting policy, people could thus be excused from sexual harassment or expense report fraud. A security professional should strive to ensure that information security policy is observed at the same level as other policies enforced within the organization. Policy language should be crafted in such a way that guarantees complete consensus among executive management.
For example, suppose there is debate about whether users should have access to removable media such as USB storage devices. A security professional may believe that such access should never be required while a technology executive may believe that technology operations departments responsible for data manipulation must have the ability to move data around on any type of media. At the policy level, the consensus-driven approach would produce a general statement that "all access to removable media devices is approved via a process supported by an accountable executive." The details of the approval processes used by the technology executive can be further negotiated as discussions continue. The general policy statement still prohibits anyone without an accountable executive supporting an approval process from using removable media devices.
In very large organizations, details on policy compliance alternatives may differ considerably. In these cases, it may be appropriate to segregate policies by intended audience. The organization-wide policy then becomes a global policy, including only the least common denominator of security mandates. Different sub-organizations may then publish their own policies. Such distributed policies are most effective where the audience of sub-policy documents is a well-defined subset of the organization. In this case, the same high level of management commitment need not be sought in order to update these documents.
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