Blockchain across Oracle

Data is cryptographically encrypted

As you have learned in this chapter, data security is the most important part of this particular industry. To ensure the privacy of health records, MedicalChain is using symmetric key cryptography (https://en.wikipedia.org/wiki/Symmetric-key_algorithm). The platform encrypts the record and stores it in a datastore with the appropriate regulatory jurisdiction. The symmetric key will be encrypted with the public key of a 2048-bit key pair for each of the entities that are given permission to access the patient's record. Thus, every time the record is decrypted with the owner's private key and stored, the symmetric key is encrypted with the new key of the authorized user (that is, the practitioner or institution). ...