Architecting HIPAA in the Cloud Using AWS

March 30, 2020 Chandani Patel

The Health Insurance Portability and Accountability Act of 1996 (HIPAA) is a law in the US published to protect privacy of patient’s medical records and health related information provided by/to patients, also known as PHI (Personal Health Information). HIPAA compliance aims to lower the administrative cost in healthcare by defining the standards in the electronic transmission of records. HIPAA is designed to help fight abuse, waste and fraud in insurance and healthcare delivery. Managing HIPAA compliance in the cloud is more challenging but AWS provides services to design and implement high-load systems to process vast amounts of ePHI with HIPAA.

Sign AWS Business Associate Agreement (BAA)

As per HIPAA compliance guidelines, each covered entity must follow the HIPAA security rules. AWS services are certified to ensure HIPAA compliance. AWS signs BAA agreement including legal responsibilities with customers, notifying them in case of any breach on physical infrastructure.

HIPAA compliance responsibility is on “Covered Entities” not on AWS

AWS is responsible for breach of physical infrastructure which means application level security is Covered Entities’ responsibility who are developing the application. AWS operates with shared responsibility. AWS is responsible for certain security and compliance for protecting infrastructure on AWS like compute, storage, database, network, regions and availability zones, and edge location.
AWS customers are responsible for services they use to create solutions, e.g. platforms, OS, Applications, Client-Server side encryption, IAM, Network traffic protection, Customer Data.

Encryption and Protection of ePHI

HIPAA security rule addresses the data protection and encryption of PHI in transmission (in transit) and in storage (at rest) in cloud. AWS offers a set of features and services which provides key management and encryption of PHI.

 

AWS Services for Encryption

AWS KMS

KMS enables control of the encryption key which can be integrated with several services to protect data at rest and transit like S3, SQS, EBS, RDS, Elastic cache, lambda, EC2 image builder, SNS, SES and many more

AWS CloudHSM

CloudHSM is hardware that provides use of custom encryption keys using FIPS 140-2 level 3 validated HSM

 

Auditing, Back-Ups, and Disaster Recovery

Auditing and monitoring are technical safeguard which must be addressed in cloud architecture. This means any storage, processing or transmission of ePHI information should be logged in the system to track the usage of data. The architecture should have notifications on any unauthorized access and threat on ePHI.

The solution must have an emergency plan to protect ePHI information in case of disaster to avoid the loss of patient information. It should plan the backup of collected, stored and used ePHI information with recovery processes, that can enable restoration of information in case any information is lost.

 

                                             Fig: 1 AWS Services for Auditing, Monitoring & Backup

Authentication and Authorization

A HIPAA-eligible system must document the authentication and authorization mechanism in the System Security Plan with all roles and responsibilities, along with configuration control process, approvals, and process for all change requests.

Following are few points to be considered while architecting with AWS

  • IAM service to provide access to specific services
  • Enable MFA to access AWS accounts
  • Grant Least privileges
  • Rotate credentials regularly

Architecture Strategies

One should not assume that all HIPAA eligible AWS services are secured by default, but it requires several settings to make solution HIPAA eligible. Following are few strategies which should be applied with HIPAA applications

  1. Decouple the infrastructure, database and applications which are accessing/processing protected PHI data which can be achieved through,
    1. Turn off all public access, avoid use of access-secret keys, and use IAM with custom roles and policies and attach identity for access the services
    2. Enable the encryption for storage services
  2. Tracking the data flows and setup auto monitoring and alerts
  3. Keep the boundaries between protected and general workflows. Segregate the network, create external VPC with multi AZ architecture which separate subnets for different application layers and private subnets for backend application and database layers

Sample Architecture of HIPAA

Fig: 2 HIPAA architecture

Above diagram is for 3-tier health care application which is a HIPAA eligible solution:

  1. Route53 is connected to WAF (Web Application Firewall) with Internal Load balancer, with this public networks are avoided, ACM (private security authority) is used to encrypt data in REST using HTTPS
  2. VPC (Virtual Private Cloud) is created with six private subnets in different availability zones for Web, Backend and database tier
  3. 2 internal ELB (Elastic Load Balancing - 1 for web and 1 for backend) with auto scaling groups to handle & distribute traffic between multiple instances and instruct to launch new instance when load is high
  4. MySQL and ElasticCache is launched in multiple availability zones with HSM (Hardware Security Module) to encrypt the data
  5. Cloudwatch is configured for monitor, setup alerts and application logs
  6. CloudTrail, Config and Trusted Advisor is used to audit AWS resources. IAM is used to restrict access of AWS resources and Management console
  7. Inventory is used to get visibility of EC2 instances

Using AWS platform, any organization can design secure, robust, reliable, and efficient HIPAA eligible solutions. It can help validate existing solutions to identify risks, security measures and loopholes in the system to meet HIPAA compliance requirements for any healthcare solution.

About Author

Chandani Patel is AWS Certified Solution Architect, AWS Business & Technical Professional, Technical Lead on several domains – Cloud Solutions, IoT Solutions, ML&Data Science at VOLANSYS. She is Cloud Solution Architect with expertise in designing, developing and architecting cloud solutions for public clouds (Azure, AWS, Google & Bluemix), private clouds & hybrid clouds.  ​

 

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