The growth of digital tools, such as mobile phones, computers, and tablets, and the advent of new information and communication technologies have generated new phenomena in terms of communication capacity and data processing. This phenomenon is called BYOD, which stands for Bring Your Own Device, meaning employees use their own devices to access company resources within the company's IT network, whether internally or externally. On the one hand, it has brought many benefits and opportunities, but on the other hand, it carries many cybersecurity risks. Incidents of cybercrime, embezzlement, espionage, and cyberattacks. These are recorded every day in ZELECAF countries in general and in Congo Brazzaville in particular. In this article, a contribution and optimization to the security of BYOD systems in the financial authorities of the countries of the African Continental Free Trade Area are presented. Congo Brazzaville was chosen for the field study, and a few Central African countries were chosen for an online study. The results obtained are encouraging to the extent that the survey carried out revealed the use of digital tools in financial management by workers. Also, the lack of solid security in the existing computer networks within these structures was noted. The principles of raising public awareness of cybersecurity culture, protecting information, authenticating passwords by the IT manager or network administrator, hiding the wireless network, and enabling the firewall are part of the attempted solutions proposed. Compared to studies in the literature, the methodology is adapted, so that in the literature [14], [15], the majority of surveys were carried out in the field, with a very limited number.
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