Today, the public sector companies and government agencies are sensitive to cyberattacks. Over the years, the number of data breaches and DoS attacks in the public sector has skyrocketed. Not all of them, though, were disclosed or published. A few of them made the headlines, for example, the anonymous attack on SAP systems of the Ministry of Finance of Greece. Still, there has never been any official comment accepting or declining the authenticity of this information. Another example is the attack on the HR system of the US Department of Energy that resulted in the leak of employee data.