Readme.md

Blockchain in health records confidentiality

• We have two kinds of Users - Doctors and Patients
• A transaction involves a doctor and a patient
• For simplicity we have implemented zero knowledge proof for only patients
• All the keywords, usernames used are case sensitive
• Initially blockchain is empty
• Atleast one patient has to be registered before adding or viewing a transaction
• Operations should be performed in the following order (initially): register-->add-->view

If using a java ide, go to src and run

If using terminal to run then change directory to its src:
To compile use: javac users.java StringUtil.java Record.java Block.java Main.java
To run use : java Main

options displayed: view/add/register
// atleast 1 patient's details need to be registered for further process

1. Register

  enter-register
	/* Enter patient's name
   	Enter patient's password 
	-->Password should be an INTEGER only and preferably a small integer as it is used in calculations of ZKP
   	Verify patient's password
   	sample i/p-
   	sahil
   	2
   	2
	*/

	// details added successfully

enter-yes //to continue

2. Add /* for simplicity we have predefined 3 doctors in the database-

doc1:
name:mishra
password:1

doc2:
name:gupta
password:2

doc3:
name:batra
password:3
*/

options displayed: view/add/register

	enter-add
	// to add medical details/reports

	"Enter doc name"



	enter details of doctor
	/*
	example-
	raj
	3 */

	enter the deatils of the patient he checked
	/*
	sahil
	*/
	
	Zero Knowledge Proof to verify user:
	-->Here x is the password of the user
	-->Pick up a random number between 0 and 9
	-->Calculate h (h=(2^r)(mod 11)) and enter h
	-->A random-bit b(0/1) is generated
	-->Compute s=(r+b*x)mod(10) and enter s

	/*
	Kindly verify yourself as a user
	Zero Knowledge Proof
	Choose a random number between 0 and 9
	Please compute h=(2^r)(mod 11) and Enter h
	2
	h is 2
	Random bit is 0
	Please compute s=(r+b*x)mod(10).Here x is the number you are proving you know
	1
	Zero Knowledge Proof Successful.You are verified as registered user
	*/

	enter-y // to input the reports, medical records,prescription etc.
	/*
	example-
	'y'
	BP 150/95
	'y'
	Blood Sugar Level(fasting) 121
	'y'
	Next checkup scheduled on 07/05/2020
	*/

	enter-n //once the entire data is entered

// Block Mined Successfully and block hash is displyed

	/*
	Trying To mineBlock...
	Block Mined!!! : 0000e326186933fa83f0efd581d09409022ec07b73a10f549bbaa6472e8a1175
	*/

enter-yes // to continue

3. View

options displayed: view/add/register

	enter-view //to view several records 
  
	enter-d or p

	/*
	'd' if you wish to know the details/records of several patients checked by a doctor
	'p' if you wish to fetch the details/records of patient's check-up history
	*/
	if d is selected
		enter required details of doctor
	if p is selected
		//ZKP verification is done similar to the one explained in 'add' option
	
	record blocks are displayed along with TimeStap at which the data was recorded

SAMPLE RUN

1. Register

  
  (view/add/register)register

  sahil
  2
  2

  (continue?)yes

2. Add

  (view/add/register)add

  raj
  3 

  sahil

  Kindly verify yourself as a user
  Zero Knowledge Proof
  Choose a random number between 0 and 9
  Please compute h=(2^r)(mod 11) and Enter h
  2
  h is 2
  Random bit is 0
  Please compute s=(r+b*x)mod(10).Here x is the number you are proving you know
  1
  Zero Knowledge Proof Successful.You are verified as registered user

  y
  BP 150/95

  y
  Blood Sugar Level(fasting) 121

  y
  Next checkup scheduled on 07/05/2020

  n

  output-
  Trying To mineBlock...
  Block Mined!!! : 0000e326186933fa83f0efd581d09409022ec07b73a10f549bbaa6472e8a1175

  (continue?)yes

3. View

  (view/add/register)view

  'd'
  raj
  3

  output-
  TimeStamp at which data  was recorded:1587718441125
  Doctor:raj
  Patient:sahil
  His Medical Data:
  BP 150/95
  Blood Sugar Level(fasting) 121
  Next checkup scheduled on 07/05/2020

  (continue?)yes

  similarly for patient-

  'p'
  sahil

  Kindly verify yourself as a user
  Zero Knowledge Proof
  Choose a random number between 0 and 9
  Please compute h=(2^r)(mod 11) and Enter h
  4
  h is 4
  Random bit is 1
  Please compute s=(r+b*x)mod(10).Here x is the number you are proving you know
  4
  Zero Knowledge Proof Successful.You are verified as registered user

  output-
  Time:1587718441125
  Doctor:raj
  Patient:sahil
  Patient's Medical Data:
  BP 150/95
  Blood Sugar Level(fasting) 121
  Next checkup scheduled on 07/05/2020

other blocks are added similarly!!