The invention relates to the technical field of block chain application, in particular to a
privacy protection autonomous
identity management system and method based on a block chain in an
Internet of Things scene, each identity issuer and an identity
verification party form an alliance chain, the identity issuer generates
system parameters and registers, uploads and revokes an equipment identity, and the identity
verification party verifies the equipment identity. The
verification party retrieves equipment identity verification and
revocation information uploaded to the block chain by the issuer, and constructs a
distributed management framework of
the Internet of Things equipment identity based on the block chain; an identity issuer generates a plurality of unassociated anonymous identities for equipment based on a one-way
hash chain,
privacy protection certificateless signature is realized, and one-time anonymous identities are added into leaf nodes based on a
Merkle Tree structure to generate verifiable declarations so as to protect association among a plurality of verifiable declarations of the equipment and realize attribute selective disclosure; and the on-chain node realizes management of device identity registration,
authentication, tracking and
revocation and updating of a
full life cycle by using an intelligent contract. According to the invention, the privacy requirement of
the Internet of Things equipment can be met.