Even though security requirements in medical care are traditionally high, most computerized medical care applications lack sophisticated security measures or focus only on single security objectives. This project is a web based application for medical consultation system, it describes a special security way to process a medical care data which transporting through a public networks such as the Internet. It proposes a cryptography approach using RC5 as fast and strong block cipher encryption algorithm. In this application, the patient creates an encryption key to encrypt a medical care consultation inquiries and questions before he send it transit through the transport media to the system database. The doctor is a server side who''s the administrator and responsible to decrypt and manage the data. This study is to deliver the approach of confidentiality, integrity and trust to the patient''s medical data.