E-commerce has presented a new way of doing transactions all over the world using internet. The success of ecommerce depends greatly on how its information technology is used. Over the years the rate at which ecommerce sensitive information is sent over the internet and network has increased drastically. It is for this reason that every company wants to ensure that its ecommerce information is secured. There is need for ecommerce information transmitted via the internet and computer networks to be protected. There is substantial growth in the areas of credit card fraud and identity theft because the internet is a public network with thousands of millions of users. Amongst users are crackers or hackers that carry out the credit card fraud and identity theft in numerous ways facilitated by poor internet security; a concern regarding the exchange of money securely and conveniently over the internet increases. The criticality, danger, and higher priority importance of any e-commerce money transfer makes it a hot area of research interest in modern computer science and informatics. E-commerce industry is slowly addressing security issues on their internal networks but security protection for the consumers is still in its infancy, thus posing a barrier to the development of e-commerce. There is a growing need for technological solutions to globally secure ecommerce transaction information by using appropriate data security technology. The technology solution proposed for solving this security problem is the RSA cryptosystem. This research paper focuses on securing ecommerce information sent through the computer network and internet using RSA cryptography. It elucidates the implementation of RSA algorithm and shows that ecommerce security powered with RSA cryptography is very important in ecommerce transaction. While many attacks exist, the system has proven to be very secure