This paper uses the lightweight (simple cryptography, high security and fast speed single-key cryptographic algorithms such as: RC4, RC5, SMS4 etc.) cryptography, and a security single-key management technology to solve the key update management problems of lightweight cryptography. In smart chip of sensor/RFID reader device and encrypt card of the authentication center in the internet of things(IoT), the device authentication, signature/verification and encryption/decryption protocols are

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... lished to ensure the device of sensing layer in IoT is credible, and sense information is credible, integral and confidential. Thus, an information security for perception layer of IoT is built.