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Cryptography is the collection of techniques used to hide the information securely from the eavesdroppers during its transmission over the network. Cryptography is centuries old, during the course of time a number of techniques have been proposed and developed by the researchers. Some of these techniques have become popular and widely in use today in a varieties of applications. This paper discusses the two most important categories of techniques symmetric and asymmetric cryptosystems.doi:10.9790/0661-16431118 fatcat:rl3mmtxoavctbb3sjzs6jkerny