Could blockchain have prevented the CBSE Data Leak in India?

Could blockchain have prevented the "CBSE Exam Paper Leak in India" ?
Definitely yes!  I will explain how it will work and I have a picture that explains how 3 sets of Exam Papers set by 3 people are put on blockchain and they move across the 'Exam Paper Distribution Process'. The data/question papers is accessible only to those authorized users (those who are given access). No one else can access or hack blockchain and leak the papers except the authorized personal who will get identified and caught if they try to leak exam paper. The process is transparent, secure and has an audit trail which gives everybody confidence.

Blockchain was invested by Satashi Nakamoto in a paper he published in 2008.  Let me explain blockchain as I understand it.

1. Blockchain is a software program that runs on a network of computers  (for now this definition is good enough for newbies)
2. If a document is put on blockchain then blockchain allows AUTHORIZED USERS" to update the document but does not allow then to EDIT or DELETE any data. Its like a notebook in which you can write and notebook records the date and time of your writing but if you make a mistake and want to correct it it will not allow, you will have to add a next entry saying previous entry was a mistake and should be ignored. In short history of every transaction can be viewed at any point of time which makes the document trust worthy (of-course there is security that ensures that document cannot be tampered so don't worry about it for now)
3. Next aspect of blockchain is that every authorized user gets a copy of the blockchain record/ledger every time it gets updated. So if someone wants to tamper his copy of the document it is of no use because every other user will know what action you have performed this is 2nd level of trust.
4. Blockchain maintains all documents for ever and no one is allowed to delete any document  not even a hacker can do it. So any point of time any authorized user can view the document.

Now take our example of exam papers and how blockchain and a well defined process can prevent paper leak -

1. Lets assume paper setters, CBSE officials at center and in states & all school principals are authorized users of blockchain
2. Assume 3 paper setters create 3 sets of Mathematics exam paper and put them on block chain
3. Blockchain will record the transaction and inform all users that papers have been submitted and they will get a copy of the paper which is encrypted  with a password.
4. At this  stage only CBSE  officials have the password to view the papers and approve them to be used in exam. School principals come to know papers are set but cannot access them till password is given to them
5. On day of the exam CBSE will decide which paper from the 3 sets  has to be used for exam and 1 hour prior to the exam they will share the password with School principals. So far it is ensures that if paper leaks then it will be done by paper setter and he will get caught but less chance since he does not know which paper will be used for the exam
6. Once principal get the password it is their responsibility to take print, update the block chain as soon as they take the print so everybody in CBSE knows when the papers were printed and how many copies were printed. Next the principal is responsible to distribute ( with help of his staff who are not carrying mobile devices) papers in the classroom
7. Any student is missing and question paper is unused the school updates the blockchain that x number of paper are unused and they are being sealed and kept in principals custody.
8. From beginning to end each step, each transaction is recorded on blockchain and immediately all users on blockchain get informed over the internet. If there is any leak it can only be possible if the principal and his staff do it as no one else has a hard copy of the papers, not even CBSE.
9. This is a simple explanation of the process. Actual implementation can have more customization and security for example using GPS or RFID tags from the time  exam papers  are printed to track the Real Time movement of exam paper till they reach class rooms and many other security aspects can be added for additional security at the last leg of delivery.

I don't have knowledge of the system used by education institutes to deliver examination papers and there could be minor changes in the process. What is required is the transparency, security and trust that blockchain or similar solution can deliver so that students have faith in the system. Diamond merchants face challenge of fake or over valued diamonds and they use blockchain to trace the journey of each diamond from the mine to the stores and all the way to final buyer. Every diamond sold by DeBeers has a complete audit trail of every person who had handled each diamond and there the transparency in the process builds trust. Blockchain promises trust in your business process.