The study aimed to identify the effectiveness of information security in improving the quality of decision-making. The study is based on information security and its effect on improving the quality of decision-making. It was conducted in the General Directorate of the Ministry of Finance in Kafr El-Sheikh Governorate in 2018. The researcher used a questionnaire to identify the effect of information security on improving the quality of decision-making. The study sample consisted of employees in the Real Estate Publicity Department; some of them were from Real Estate General Taxes Department and Real Estate taxes Department in Kafr El-Sheikh. The sample was 65 employees. The most important results of the study were that there is an effect of information security on improving the quality of decision-making. The study recommended the need for understanding the nature of threats, risks and attacks that affect information security, the necessity of monitoring employees periodically. It also recommended the necessity of installing and extending network cables in protected places. Moreover, it necessitated using anti-virus software.