This paper presents a micro-certificate based key management scheme which mainly manage the keys relevant to the cryptography authentication system for internet of things (IoT), including key seeds, transmission key, storage key, authentication key and signature/encryption key. This paper gave detailed management scheme for keys' life cycle, and the combined symmetric key technology (CSK) and secure chip technology are used to improve the security for the key management in IoT environment. The

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... ey Types The Keys involved in the key management based on the micro-certificate are symmetric keys. That is the communication parties use the same key and encryption algorithm for data encryption and decryption. Symmetric key has the characteristics of short key length and low cost for computing and storage, which is very suitable for the IoT. The micro-certificate based key management includes following keys.