The project is designed to share data with high frequency. And ultimately establish communication as secure as possible. For secure communication, the data is send using encoded form so the unauthorized user can’t access the data and if he receive data then data will be in the encoded format. So it’s of no use to an unauthorized user. This paper is based on the concept of Li-fi. Here, transmitted data are encrypted by a Vigenere cipher algorithm in order to ensure secured optical communication. Further, the encrypted data is decrypted on the receiver portion. In today's digitalized era, for the proper functioning of our daily professional life, we need effective communication. Whereas the limitations like low bandwidth and data rate in Wi-Fi, Microwave and RF along with EMI interference hampers the interactions. The Optical Wireless Data Transmission overcomes the above limitations. This innovative and new technology provides high-speed wireless access that offers significantly greater data capacity than Wi-Fi along with inherent security properties that eliminate unwanted external network intrusion. For security purpose, a secured encryption system has been designed based on the Vigenere Cipher technique which is impossible to break. The project consists of an LED at the transmitter section to transmit encrypted data which can be received at the receiver using the IR sensor by any angle with high reliability. In addition, the integration of wireless data transfer along with encryption generates a measurable reduction in both infrastructure complexity and energy consumption