MULTI-ATTRIBUTE MECHANISM ATTRIBUTE-BASED ENCRYPTION METHOD WITH TRACKING FOR CLOUD-ASSISTED INTERNET OF THINGS

摘要

The present invention relates to multi-attribute mechanism attribute-based encryption with tracking for a cloud-assisted Internet of Things, belongs to the field of attribute-based encryption, and solves the problem of how to realize multi-attribute mechanism attribute-based encryption with safety, outsourcing decryption and tracking leakage. The method comprises the following steps: a central mechanism executes system initialization, generates public parameters and discloses the public parameters; each attribute mechanism is initialized to generate a secret key pair of the attribute mechanism, and a public key in the secret key pair is disclosed; a data owner performs symmetric encryption on plaintext data, performs attribute encryption on the symmetric key based on a hidden access structure, and generates an integrity verification value; a data user applies for a decryption key from the attribute mechanism according to the owned attribute; during decryption, the data user first recovers the access structure, generates an outsourcing decryption key and sends the outsourcing decryption key to a cloud storage center for semi-decryption; the cloud generates a semi-decrypted ciphertext and returns the semi-decrypted ciphertext to the data user; and the data user completely decrypts the semi-decrypted ciphertext according to the decryption private key.