This research paper is about implementing security protocols in IoT. IoT devices are tremendously getting popularity and are in used frequently by users. Security is more critical in IoT. Here we are using a privacy mechanism approach is Attribute-Based Encryption (ABE). A public-key encryption approach that enables smooth access control, scalable key management, and flexible data distribution. We concern with two types of ABE, B Key-Policy Attribute-Based Encryption (KP-ABE) and Ciphertext-Policy Attribute-Based Encryption (CP-ABE) are the best for secured use of IoT. The main focus of this implementation is to applying security to the pub-sub architecture using KP-ABE. KP-ABE mechanism. We are implementing AES cryptography on the payload. By use of cipher key to generate dynamic S-Box which is changing with every changing of the cipher key. That results in cryptographic strength.