Internet of Things (IoT) deploys a wide range of technologies including wireless sensor networks, machine-to-machine communication, robots, internet technologies, and smart devices. IoT is a novel phenomenon in the IT world wherein objects can transmit data, and interact through the internet or intranet networks. But the most important and crucial issue on the IoT is privacy and data security. The objective of this paper is to create a new encryption model for data storage servers in an IoT-based irrigation systems. Thus, a hybrid encryption algorithm based on Elliptic Curve Cryptography (ECC), RC4, and SHA-256 is proposed to protect sensitive data of IoT-based irrigation systems. The proposed model uses ECC to improve RC4. In RC4, XOR operation is performed using a key encrypted by ECC and shift-right, and then the resulting data are transformed to SHA-256 to ensure security. Simulation results indicate that encryption and decryption time in the proposed model are shorter than other models like XXTEA & ECC, XXTEA & RSA, ECC&3DES&SHA-256, RC4&3DES&SHA-256, AES&RC4&SHA-256, AES&3DES &SHA-256, RC4&AES&SHA-256, RC2&3DES&SHA-256, and ECC&RC2&SHA-256 with, 43.39%, 66.03%, 45.28%, 54.71%, 50.94%, 33.96%, 33.62%, 24.52%, and, 15.09% respectively.

物联网（IoT）部署了广泛的技术，包括无线传感器网络，机器对机器通信，机器人，互联网技术和智能设备。物联网是IT世界中的一种新颖现象，其中对象可以传输数据并通过Internet或Intranet网络进行交互。但是，物联网上最重要和至关重要的问题是隐私和数据安全性。本文的目的是为基于IoT的灌溉系统中的数据存储服务器创建新的加密模型。因此，提出了一种基于椭圆曲线密码学（ECC），RC4和SHA-256的混合加密算法，以保护基于IoT的灌溉系统的敏感数据。提出的模型使用ECC来改进RC4。在RC4中，异或运算是使用ECC加密并向右移位的密钥执行的，然后将所得数据转换为SHA-256以确保安全性。仿真结果表明，该模型的加密和解密时间比XXTEA＆ECC，XXTEA＆RSA，ECC＆3DES＆SHA-256，RC4＆3DES＆SHA-256，AES＆RC4＆SHA-256，AES＆3DES＆SHA-256，RC4＆AES＆SHA-256，RC2＆3DES和SHA-256和ECC＆RC2＆SHA-256，分别为43.39％，66.03％，45.28％，54.71％，50.94％，33.96％，33.62％，24.52％和15.09％。