The Internet of Things is interrelated computing devices; each one has a unique identifier, one of the main advances of it the possibility of transfer data over the network without the need of human assistance. However, transfer data over the network susceptible to different types of attacks. The required encryption time of the classical encryption, techniques are not suitable to secure IoT data. This introduces the need for lightweight encryption algorithms in order to provide the required security level and decreasing the encryption time. In this paper a lightweight of one encryption round algorithm is proposed based on the Skew Tent Map. This map is used to produce the required confusion as well as diffusion effects to decrease the required encryption time to be used for real-time IoT applications. The obtained security analysis results confirm the high security level of the proposed algorithm. Moreover, the required encryption time comparing to the presented IoT encryption algorithm is less time. Encryption time and standard security analysis of the proposed cryptosystem confirms that this proposal is suitable for securing real-time applications.