Maybe you have noticed it. Privacy is an issue. A bit strange since there are only 19 days left until the new EU General Data Protection Regulation (GDPR) will become fully enforceable throughout the European Union.

So before end of May 2018 all organizations that process data of EU citizens must comply with this General Data Protection Regulation. Determining how to handle the GDPR is not straightforward. The GDPR introduces a right for individuals to have personal data erased. This right to erasure is also known as ‘the right to be forgotten’. This means that individuals can make a request for erasure verbally or in writing. This rule is outlined in article 17 of the GDPR, but the technical consequences and complexity that comes with this rule are not trivial to implement. And a clear answer for implementation is not present in the GDPR. So even deletion is risk based.

A key question is how to erase data that was collected?

Is seems simple, but from a technical point of view real and permanent erasing of data is a real challenge!

Using a standard delete function from a database or operating system hardly will remove data. There are great ways to get data back after administrator errors or disasters. Deleted data is often still recoverable. So simply using a ‘delete’ doesn’t meet the GDPR compliance for erasure. Besides were do you start when deleting data? Data is often shared with suppliers, partners, resellers. But data is also transfered to various marketing companies or even sold. And data is also often stored on various on-line or off-line backups facilities. And do not forget to check if data that must be erased is present on log and audit files.

So to guarantee that data is deleted from all these different players is in practice hard to realize. Of course the key is not to share or sell gathered data in the first place, but this is not always possible. Some options are:

  • If you have encrypted personal data an option for erasure is to use crypto-shredding. This is the practice of ‘deleting’ data by overwriting the encryption keys. However there can be consequences for data you do not want to delete if you are destroying your encryption keys.
  • Use certified data erasure software. Data erasure software should comply with requirements to erase hidden areas, provide a defects log list and list bad sectors that could not be overwritten. Standards and rules for deleting data for various industries (e.g. health care and military) exist for many years already. Make reuse of this standards and rules to implementation of the GDPR easier. But erasing a data collection is  often easier that only deleting a single record.

If data is or was available on the Internet, intended or unintended, is will be very hard to delete it.

“Internet never forgets”

There are just too many companies that collect your data present on Internet and store it in private data caches. But asking a company to delete your data will always help.

This blog post will be added (after rewrite) as an extension on the ‘Open Reference Architecture for Security and Privacy‘. We are working on an renewed version. Please join us!

The Web never forgets: The right to be forgotten
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