The near field communication (NFC) technology helps save both time and power when compared with Bluetooth and other similar technologies. However, NFC is vulnerable to various networking attacks such as message modification. In this work, a secure processing technique is introduced to protect the NFC devices and associated data from several attacks. A certificate record is added to the NFC Data Exchange Format (NDEF) message to enhance security. The proposed processing technique in a NFC system checks the authenticity of the sender, then if appropriate, processes the incoming NDEF messages and stores them in device memory. Using MATLAB, an NFC system with the proposed processing technique is simulated. Simulation results suggest that the processing time increases linearly as the certificate size increases and the processing time remains almost the same for various record sizes. It is also observed that the proposed protocol offers better security by detecting tag manipulation, certificate modification, etc. The proposed secure processing technique for NFC can be extended to enhance security in ubiquitous computing and mobile communication.