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IEEE/ICACT20220056 Slide.06        [Big Slide]	Oral Presentation
	This slide shows the overview of our proposed secure secret key-sharing system. Public key cryptosystems such as TLS/SSL are not suitable for IoT environments because of the heavy computational requirements of prime number generation. Therefore, our proposed system uses a secret key cryptosystem for data encryption instead of an expensive public-key cryptosystem. A secret key cryptosystem is lightweight cryptography with a low processing time variation. Our proposed system uses a threshold secret-sharing scheme to share the secret key among a publisher and subscribers. This secret-sharing scheme prevents an attacker from obtaining the secret key.

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