With the advent of technologies like Internet of Things (IoT) and Machine to Machine (M2M) communication, a huge quantity of data is generated every day. Being a distributed system of constrained devices, this data needs to be communicated securely without wasting the resources of constrained devices. Therefore there is need of appropriate lightweight security protocols to avoid the security threat to future internet. In this context, a study of lightweight security algorithms is presented in

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... is paper. The algorithms are first theoretically analyzed followed by their implementation on Cryptool and Raspberry Pi in order to check their efficacy.