One of the greatest strengths of a public cloud is also the source of its greatest weakness. The flexibility and ease of access that a public cloud offers, combined with the data of various users stored in one place, also opens a public cloud to the dangers of security threats. For example, your company data could be compromised by accident in a public cloud environment if hackers target another client on the system. That breach leaves all user data exposed, not just the targeted user.
If data security is of the utmost importance in your IaaS environment, you may want to consider a private cloud. The infrastructure, apps, software, and hardware in a private cloud are tailored to your specific needs and your data is stored securely in a private environment by itself. This also allows you to have greater control over access and the security measures in place to protect data.