The Internet of Things (IoT) becomes a leading field of computer science, which simplifies the life of human beings. The IoT, devices can interconnect and communicate with each other, in a fully autonomous mode. This autonomy has made the IoT network vulnerable to various security threats. However, due to this autonomy, there is a strong need for reliable security and storage mechanism for authentication to exchange data between IoT devices. To solve this problem, we propose an efficient method known as SCAB-IoTA, which ensures identification and authentication of IoT devices and also provides secure communication in the open environment. Along with authentication and secure communication, the scheme also ensures data integrity. SCAB-IoTA used the blockchain and hybrid cryptosystem (the combination of Advanced Encryption Standard (AES) and Elliptic Curve Digital Signature Algorithm (ECDSA) cryptographic techniques) to enhance the security of IoT applications to prevent various attacks along with less computational, and storage overhead. Furthermore, we have a secure cluster of IoT devices based on angular distance (AD), so that devices can securely communicate without any interruption. A secure and robust trust mechanism has employed to build these clusters, where each IoT device has to authenticate itself before joining the cluster. The obtained results satisfy the IoT security requirements with 60% reduced computation, storage and communication cost compared with state-of-the-art methods. The security analysis illustrates that SCAB-IoTA withstands against various cyberattacks such as impersonation, message replay, man-in-the-middle, and botnet attacks.

物联网（IoT）成为计算机科学的领先领域，从而简化了人类的生活。物联网设备可以以完全自主的模式相互互连和通信。这种自主性使物联网网络容易受到各种安全威胁的攻击。但是，由于这种自主性，强烈需要可靠的安全性和存储机制来进行身份验证，以在IoT设备之间交换数据。为解决此问题，我们提出了一种称为SCAB-IoTA的有效方法，该方法可确保IoT设备的标识和身份验证，并在开放环境中提供安全的通信。除了身份验证和安全通信外，该方案还确保了数据完整性。SCAB-IoTA使用区块链和混合密码系统（高级加密标准（AES）和椭圆曲线数字签名算法（ECDSA）密码技术的组合）来增强IoT应用程序的安全性，以防止各种攻击并减少计算和存储开销。此外，我们有一个基于角距离（AD）的安全的IoT设备集群，因此设备可以安全地进行通信而不会受到任何干扰。已采用安全且强大的信任机制来构建这些集群，其中每个IoT设备都必须在加入集群之前对其自身进行身份验证。与最新方法相比，所获得的结果可以满足IoT安全要求，并减少60％的计算，存储和通信成本。