Data Anonymization – An Overview
Have you ever heard of the hacktivist group anonymous? What is the first thing that comes to your mind? Oh yeah! a group of people hiding in obscurity and carrying out targeted attacks at popular constituted authority (most times to demand accountability). You don’t know them, you have never seen them but you do know they exist. It’s like in popular James Bond movies; the identity of the agent – often the main character – has to be kept hidden. All the procedures and precautions employed in keeping all these identities secret is what anonymization is all about. In the instances above, revealing the identities of the stakeholders is deemed as jeopardy to their safety. Therefore, the best way to keep them safe enough to achieve their aim is to have them work from the shadows.
It is no news that data – in today’s world – translates to power. Just like in the movies too, everyone does anything to hold on to it. From business, to warfare to basic human activities, everything depends on data availability. It is the metaphorical James bond of internet operations; in this case however, the safety of real life humans is at stake. The increasing importance of data and the constant attacks on database systems naturally spurred an evolution of cyber security techniques. Due to that, data anonymization was born.
Essentially, data anonymization is the process of irreversibly hiding data in obscurity. It is a process of removing any thing that links a data set to the owner of the data. In more technical terms, it is a process of altering data – by encoding (or let’s say encrypting) key identifiers – to complicate identification and foster safer data movement between systems. For instance, a bank may encrypt the name, address and other biometric data of their users while attempting to transfer a compilation of their daily savings. That way, exposure to the data set prevents an attacker from tracing them to actual persons.
Oh no! You don’t expect that there is no absolutely no means around this, do you? Not at all, even James bond gets discovered at times. De-anonymization is like the polar opposite of data anonymization. It is when attackers – through critical cross referencing with relevant sources – match data to the data subjects and key identifiers. That way, the data is no longer protected. However, there are different methods of anonymization, and there are procedures to prevent possible de-anonymization of these data-sets.
Data anonymization could prove to be quite a reliable way of securing data and combined with other aspects of database management. You definitely have nothing to lose.
Of course, not all data sets should be subject to anonymization; that defeats the whole purpose of obscurity in the first place. It is important that every database administrator can identify some data-sets to make anonymous and some that they should bother with.
The answer to ‘what data should be anonymized’ may appear quite simple – the obvious answer would be “sensitive data”. However, this creates a room for subjectivity. Sensitive data differ with sector and individual; while contact info may not be deemed private to a marketing agency’s CEO, it may be very private to top security personnel.
By standard practices however, Personally Identifiable Information (PII) are meant to be kept safe. Therefore, they are a more perfect subject for anonymization than any other type of data set. This doesn’t in any way take away the issue of subjectivity. As a matter of fact, the term PII is not only subject to industry interpretation, there is a huge influence of legality on what PIIs should be.
However, there are some sets of data that are generally deemed as PIIs (at least by the vast majority) irrespective of industry or legal influence. Let’s consider some examples of these PIIs:
As mentioned above, the list may go down further depending on the industry involved. In the end, it is left to the company policy and discretion of the database administrator to figure out which data set pass as sensitive, and which does not. After a selective prioritization of data sets, you could choose the data-sets that top your list to anonymize.
As indicated earlier, there are different means to this same end – which is data anonymization. Each of these techniques plays on different technicalities and data forms. That is; there are essential differences in their underlying principles, the end point, and the means to these different ends. Let’s properly examine these methods:
This looks very explanatory. It simply means to hide data, to give data sets another apparent identity. In data masking, you could create a duplicate (a mirror version) of a data set. In data masking, the goal is to hide the original data-sets among inauthentic ones. Different versions of the same data-sets are created at random and shuffled with the original version of data that is subject to protection. When it comes to de-anonymization, data masking makes it a tad more difficult for attackers. There are different types, and techniques to data masking. You could substitute or shuffle data to mask it. Let’s examine some of the types of data masking that are available:
Just as the name sounds, synthetic data sets are data-sets created by an algorithm with no relationship whatsoever to existent events. With the help of statistical models, these data sets are synthetic prototypes built off the original data sets meant to be protected. Some administrators consider this sleeker than making alterations to the original data-sets.
Data swapping is as simple as it implies. It is a process of shuffling data-sets to re-arrange it. That way, there would be no semblance between the original data base and the resultant records. This method has appeared very difficult for attackers to de-anonymize because of the mismatch.
This method of anonymizing data sets is applicable to numerical data inputs. To do this, you round up the data sets with a specific value and operation. For instance, you could add 8 to all the numerical values in your database. In another instance, you could use 5 as the base of your operation; you could divide all the numerical values by 5.
This method epitomizes the underlying principle of data anonymization. In this method, some data-sets are removed to make the data less recognizable. You could carefully modify a database by a specific range through removing some identifiers in the database.
In this method, you replace some private data sets (that could be identifiers) with fake ones. This method is the best for hiding data while preserving the accuracy in statistics and value. What you are doing essentially, is to replace important identifiable information with pseudonyms. It is the best method of anonymization that is used for analytical trainings and demo operations. This is the process of encoding data with the aim of re-identification. It is a much easier way to keep personally identifiable information (PII) secret and separate from other data set. Also, it is much faster to cross reference with sources and decode when compared to other methods of anonymization.
There are obvious benefits attached to adopting data anonymization methods; on the surface, we could tell that it means an extra layer of security in the very least. Let’s however check out some of the more intricate benefits of data anonymization
What possible disadvantage could be associated with the methods of data anonymization?
Using anonymized data is the preference (and compulsion) for various sectors in the real world. So, the anonymization practice finds dozens of use cases when it comes to its use and application. Let us tell you about a few:
Banks, fintech organizations, and trading platforms can access your data. However, it is not allowed for them to release it publicly, except for the cases when it is demanded by authorities.
If they start leaking their customers’ banking data to third parties, their reputation will be at risk, and their legality will soon be at stake.
So, how do they come up with various trends and statistics?
How does a trading platform tell about the volume of trade related to a particular business?
How does a bank say ‘n’ number of people took this type of loan and got help from us?
How come insurance agents talk about their average amount disbursement speed?
Well, it’s the anonymized data that helps.
Financial institutions make use of the data with no traces of its owner’s identity. They process it through machine learning algorithms and perform manual region-wise or criteria-based analysis to deliver trends and give you suggestions for the future.
A patient’s medical data is crucial and cannot be made public. Healthcare organizations, as per HIPAA compliance, have the responsibility to keep it private. And any hospital, health solution, medical platform, or fitness app is bound to comply with this standard.
But as much as this data’s safety is important, its cruciality for various medical research is proven too. Research scholars can learn about a disease’s stages, aids, trends in a region, trends related to age, and so on. Without accessing real data concerning a disease or region, medical innovation cannot happen.
That’s where anonymization comes to the rescue.
The practice helps healthcare professionals maintain patients’ privacy and helps scholars get a hold of anonymized records for their reference.
All online services websites or eCommerce stores wish to have quick insights about their site visitors and customers. For this, they need to share user data with third parties, e.g. analytics tools or agencies.
As data with identity can create problems, anonymized data is forwarded. The same data or its processed version is sent to marketing partners, social media specialists & advertising partners to help them make better pitching, targeting, and sales decisions related to the business.
This way, businesses can adhere to their industry-specific compliances and still fetch the much-required marketing data for their growth.
Every SaaS product or tool creation is inspired by real-life troubles faced by real-world people. So, to check the feasibility of the product idea or to test the product after its development, the involvement of real users cannot be ignored.
Now, to ensure users’ secrecy and have unbiased monitoring enabled, it is better to keep this test data anonymous. Through it, not only will you be able to secure users’ identities in not-so-safe development environments, but improve your product’s quality too.
Also, safety deployments needed in such a scenario are highly cost-effective.
Enterprises have internal portals to track their employees. From clock-ins to clock-outs and productivity, everything is tracked through these portals or various tools. But if this data is shown to the whole organization, employees will feel restricted, monitored, and weird. So, businesses anonymize this data and release account-wise reports in general.
Clubbing the employees' data can help enterprises have a quick glance into business performance, motivate internal teams, and come up with valuable decisions.
Let’s say you use a marketplace for finding remote work for yourself.
It’s not uncommon to see such tools boast, saying “It takes 3 Tries on an Average to Find work on our platform.” How can they show off such data when sharing user details is against compliance?
Well, they are not doing anything illegal. Thanks to the anonymization of data.
Such online tools or platforms anonymize their users’ data and specify their tool’s usage, benefits, and performance details to the public.
Let’s explain this use case by taking Google’s example.
The technology giant, through its search engine tool, tracks your keyword searches, navigation, on-page activities, and a lot of such details. This data is then anonymized and adapted to match the needs of their clients.
Here, their clients are the businesses or marketers finding the target keywords for their business, blog, or location. And the data they see is not at all attached to your name, Gmail ID, or any similar identity-related detail. Instead, it is categorized by country, age, browser, device, and other similar factors.
That’s how Google achieves data anonymization.
From the overall appraisal, if you really value your organization’s reputation and your user’s safety, you may want to consider anonymizing the sensitive data sets in your database. After all, you need all the layers of security you can get, so what do you have to lose?
You should however be careful not to overdo it; if overdone, the data sets lose all bits of relevance. That, is exactly you may want to consider the help of a professional.
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