High Number of HIPAA Mobile Device Breaches – Time to Use Safe Harbor Encryption

Most breaches of electronic protected health information (ePHI) reported to the Department of Health and Human Services (HHS) have related to the theft or loss of unencrypted mobile devices. These breaches can lead to potentially hefty civil fines, costly settlements and negative publicity (e.g. Stanford and Idaho laptops or APDerm thumb drive). Given the increasing use of mobile devices and the significant costs of breach notification, healthcare organizations and their business associates would be wise to invest in encryption solutions that fall within the “safeharbor” for HIPAA breach notification.

Encryption and the “Safeharbor” for HIPAA Breach Notification

Under HHS guidance, ePHI is not considered “unsecured” if it is properly encrypted by “the use of an algorithmic process to transform data into a form in which there is a low probability of assigning meaning without use of a confidential process or key” and such confidential process or key that might enable decryption has not been breached.  To avoid a breach of the confidential process or key, these decryption tools should be stored on a device or at a location separate from the data they are used to encrypt or decrypt.  Encryption processes “consistent with” (for data at rest) or which “comply, as appropriate, with” (for data in motion) the National Institute for Standards and Technology (“NIST”) guidelines are judged to meet the law’s standard for encryption.  If ePHI is encrypted pursuant to this guidance, then no breach notification is required following an impermissible use or disclosure of the information—this is known as the HIPAA breach notification “safeharbor”. [78 FR 5664]

NIST Guidelines for Data at Rest

The NIST guidelines for data at rest do not provide specific requirements for encryption technology– instead, it describes common storage encryption technologies (full disk, volume, virtual, and file/folder encryption) and offers recommendations for implementing a storage encryption solution. A main takeaway from this guide is that “the appropriate encryption solution for a particular situation depends primarily upon the type of storage, the amount of information that needs to be protected, the environments where the storage will be located, and the threats that need to be mitigated.” Despite the lack of bright-line rules, the NIST guide does offer some key recommendations, such as:

  • When selecting a storage encryption technology, consider solutions that use existing system features (such as operating system features) and infrastructure.
  • Use centralized management for all deployments of storage encryption except for standalone deployments and very small-scale deployments.
  • Select appropriate user authenticators for storage encryption solutions.
  • Implement measures that support and complement storage encryption for end user devices.

Encryption Technology for Apple iOS Devices: A Case Study

The good news is that the technology is available to properly encrypt ePHI without being too burdensome.  For instance, Apple’s popular iPhones and iPads fortunately have their own built-in encryption technology.  Every iOS device has a “dedicated AES (Advanced Encryption Standard) 256 crypto engine built into the DMA (Direct Memory Access) path between the flash storage and main system memory, making file encryption highly efficient.”  Setting a passcode turns on Data Protection, and the passcode becomes a key to encrypting mail messages and attachments (or other apps), using 256-bit AES encryption. Notably, Apple’s encryption technology (CoreCrypto Module and CoreCrypto Kernel Module) has been FIPS (Federal Information Processing Standards) certified, a standard that the NIST guide references and approves.

Based on the NIST guidelines for data at rest, the following are some basic steps for implementing a storage encryption technology solution specifically with Apple iOS devices:

  • Ensure that users have up-to-date devices and operating systems (e.g. iPhone 4 or higher running iOS 4 or higher).
  • Work with an IT administrator or security expert to manage deployment of iPhones.
  • Select appropriate passcode requirements to meet your security needs, including timeout periods, passcode strength and how often the passcode must be changed. The effectiveness of data protection depends on a strong passcode, so it is important to require and enforce a passcode stronger than 4 digits when establishing passcode policies.
  • Store/transmit the minimum amount of ePHI necessary to effectuate communication.
  • Disable access to Notification Center and Alerts from locked screen to prevent display of potentially sensitive data.
  • Revise and document organizational policies as needed to incorporate appropriate usage of the storage encryption solution.
  • Make users aware of their responsibilities for storage encryption, such as physically protecting mobile devices and promptly reporting loss or theft of devices.

For additional guidance on mobile device security, the HHS Office of the National Coordinator for Health Information Technology (“ONC”) has also provided helpful tips in “How Can You Protect and Secure Health Information When Using a Mobile Device?”.

As healthcare becomes more mobile, covered entities, business associates, and health information technology vendors should become familiar with the “safeharbor” for HIPAA breach notification and the NIST guidelines for encryption of data at rest and in transit.  For more information about the HIPAA “safeharbor”, encryption standards, or HIPAA in general, please contact Jefferson Lin, Lee Kuo or David Schoolcraft.

 

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