Private information protection method and device based on block chain and storage medium

The invention relates to the field of block chains, in particular to an information secrecy technology, and provides a block chain-based private information protection method, which comprises the following steps of: firstly, performing plaintext encryption processing on private information of a private information holder based on an advanced encryption standard to form a first information ciphertext; carrying out asymmetric encryption processing on the first information ciphertext to generate a second information ciphertext, and then carrying out re-encryption on the second information ciphertext based on the authorized public key through a proxy re-encryption algorithm to generate a third information ciphertext, and enabling the authorized party to obtain a decryption key of the third information ciphertext to decrypt the third information through the decryption key, thereby performing three-layer encryption on the private information, so that a patient can be helped to store and manage prescription data in