The availability of NFC capabilities on smartphones has facilitated the development of a large number of related applications. Some of these applications may be resource-intensive tasks; and Cloudlets-based mobile computing are a good candidate to offload computation while being free of WAN delays, jitter, congestion, and failures. In this context, new use cases dedicated to NFC applications based on cloudlets are presented and a security protocol is proposed to authenticate the cloudlets by the mobile devices. The secure element of the mobile device is a trust environment used to store sensitive data and to perform cryptographic calculations.