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A5/1 used in GSM to encrypt the conversations. In this paper, proposed an enhancement of A5/1 is add fourth register will be increase the total security of proposed algorithm and apply a new filtration functions on each register to strengthen the linear combination function (XOR) with remain same the total number of bits of A5/1 are 64-bits. A5/1 is considered an efficient implementation of hardware. This proposed take efficiency implementation of hardware of A5/1 to produce an algorithm with more high security, also efficient in hardware implementation. The security of generated key will measure by using NIST tests and berlkamp-Massey algorithm.

Abstract—Internet of Thing (IoT) security has become a very important and will take a significant effect on industry of Internet of Things, due to be used in many fields. Data security issues become most important and are a difficult task for protecting the information transmitted over the IoT from intrusions. Currently, the traditional cryptography has several types of algorithms that give high security, but some of them not suitable for implementing in constrained environment. In this paper, we introduce some cryptosystems which can be used within Resource-Constrained Network Environments which used mainly to build IoT, and we will discuss the security challenges faced IoT , especially the used cryptosystems within the IoT application