Of course, blockchains are everywhere. In between Digital works are sold in the form of NFT Singer Grimes or artist People, for millions of dollars like leaps and bounds
Bitcoin, Blockchain technology is on everyone’s lips. The network of blocks that allow him to maintain control of his personal data – as the French say, today invites himself into a more serious discussion on the vaccine passport.

The Digital green certificate (Another name for the vaccine passport) is essential in the midst of controversy. As the summer holidays approach
European Commission Launches plan to facilitate travel within the European Union. It will come into effect in June. The idea is simple, “The QR code will be linked to a pan-European database, and each citizen involved will receive three types of certificates (test results, vaccination, and cure) that the Senatorial delegation recalled on March 18. All safe thanks to Blockchain ”.

Full control of personal data

Here, the concept is based «Autonomous Identity, A principle that gives each person complete control over their personal data. That way, digital actors will not rob us of our data (
Facebook,
Google A group of public and private operators who resale this information to advertisers for advertising targeting purposes). Self-sovereign identity is based on dual-key cryptography. You do not need a blockchain to do this, however it does make things a lot easier.

Basically, each person creates an encryption key pair, which contains a private key and a public key. The public key is used to send encrypted documents, verify signatures and authenticate the user. The private key should remain confidential and allow messages to be decrypted. For example, to create a bank account, a person will have to communicate with all the elements needed to create his account. The bank will generate a certificate stating that the person has a bank account and at the same time that he is a French resident, without stating his name, address or the amount in the account. From the moment a person holds this certificate, they do not have to present their identity card or their IDF bill or bank details every time they wish to adopt an administrative procedure.

“Certificates are generated by operators (banks, public administrations, doctors, vaccination centers) with confidence,” explains Primavera de Philippi, a researcher at CNRS and Harvard. This would be the same principle of real interest in avoiding the scattering of health data in the vaccination passport. Blockchain simplifies system management. Instead of giving the individual a digital document that they want to save on their computer, the certificates are created directly within a blockchain infrastructure that guarantees their authenticity. “The vaccination center will issue a token [un jeton virtuel] It will link to my account, the researcher continues. If I have this token, it means I got the vaccine.

The end of ad targeting?

Only the attending physician will keep the patient’s medical data. As in the example above, only the bank will have customer bank details. “The data is managed by a single operator I trust, so it does not have to communicate with all the operators I interact with,” Primavera de Philippi continues. My doctor will keep my data, but he will only give certificates related to the overall information. Then if I have to go for my vaccine or take a medical prescription, I do not need to show all my medical information, I will show the doctor’s certificate confirming that I have the right to get the vaccine, or I can buy this medicine ”.

We can imagine the same thing with all health data (why all personal data). In addition, you no longer have to enter your personal information to register on new sites, make online purchases and register on streaming sites. After all, this system reduces the risk of hacking, as happened in late February. Thirty laboratories were affected by the leak of medical data, which affected more than 500,000 people in France.

On paper the system looks very complicated, in practice it is not so. “E-commerce security systems are very complex, yet we use them every day. Instead of merging my credit card, I sign transactions with my private key ”. Why does the system take so long to set itself up? Brakes are not technical, but economical. If users control their personal data and are not good for their wallet, operators can no longer perform ad targeting. While waiting for the locks to be lifted, we can experience it from June onwards with the vaccination passport.