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The research study is about the enhancement of symmetric cryptosystem. It gives support to integrity of data and information security, message non-repudiation, and key management scheme of the conventional symmetric cryptosystem. This research applied different techniques and methodologies which were successfully utilized on other cryptosystems. These techniques were also known for its long time implementations in giving support to key management, data integrity verification and message non-repudiation of the symmetric cryptosystem. Also, this study compared the enhanced symmetric cryptosystem to the existing symmetric cryptosystem to emphasize their significant difference.