The Internet of things (IoT) refers to a type of network to connect anything with the Internet based on stipulated protocols through information sensing equipment’s to conduct information exchange and communications in order to achieve smart recognitions, positioning, tracing, monitoring, and administration. In this paper we briefly discussed about what IOT is, how IOT enables different technologies, about its architecture, characteristics & applications. The purpose of this paper is to provide the basic information about IoT for young readers.
Block ciphers are very important in communication systems as they provide confidentiality through encryption. The popular block cipher is an Advanced Encryption Standard (AES). Each cipher uses several rounds of fixed operations to achieve desired security level. The number of rounds in a block cipher is decided based upon the resistivity levels against the known attacks. The very first level of attack on an encryption algorithm is to search for repetitive cipher values and relate them to plaintext. The diffusion enables to spread out the repetitive plain text patterns in the cipher values. The diffusion is achieved using linear operations such as key addition, rotate byte, MDS matrix multiplication, etc. In this paper we propose a method of enhancing the diffusion power by key multiplication rather than conventional key addition used in the Advanced encryption standard algorithm. The paper discusses the problems associated with the key multiplication and provides the possible solutions. The measured results indicate more diffusion when compared with the existing method. Key multiplication, as a diffusion element, is a better solution in the design of encryption algorithms.
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