Bit Twiddling

 

Next Steps
Overview Anonymize Custom Encode Encrypt Hash Pseudonymize Randomize Redact Scramble Twiddle Shift Tokenize

Challenges

You need to remove the personally identifiable characteristics of data. At the same time, that data needs to be individualized so it can flow safely de-identified through different departments and, where necessary, be re-identified.

De-identified data should also resemble its original format. Its length, data type, or even a real-looking but different value is needed for ongoing operations and testing. Field encryption does not accomplish this goal when the ciphertext length exceeds the original field length, and data realism is lost.

The format-preserving encryption (FPE), or format-preserving scramble functions, on the other hand, can be desirable options, though in some cases may be overkill or time-consuming.

Solutions

The IRI FieldShield data masking product (as well as the IRI Voracity data management platform which includes FieldShield and DarkShield) includes many static-data masking functions, including the ability to "roll your own." Among the built-in functions to de-identify ASCII data is a character-level twiddling or bit manipulation routine to replace values (formerly referred to as the ASCII de-ID and re-ID function) 

You can use this less secure data scrambling function when speed is of the essence, and you simply want to obfuscate the column value in a unique and recoverable way.

Identification protection field

ASCII De-ID: One of several data masking function dialogs in the IRI Workbench GUI for FieldShield, built on Eclipse™.

Like the other field-level de-identification methods in FieldShield, this function can be applied to less sensitive, but perhaps quasi-identifying data, to help you comply with data privacy regulations, while leaving your non-sensitive data available for further processing. This use of this function, like all the others, gets recorded into FieldShield\'s XML audit log to help you verify compliance.

See the other functions tabbed across this section if you are looking for other ways to de-identify data. See the HIPAA page on PHI de-identifcation, and our dynamic data masking capabilities.

If you need safe, realistic test data, use FieldShield-compatible IRI RowGen software in the IRI Data Protector suite to create test database, file, and report targets.

Frequently Asked Questions (FAQs)

1. What is bit twiddling in the context of data masking?
Bit twiddling is a reversible masking function that alters ASCII characters at the binary level. It provides a quick way to obfuscate values in a unique but recoverable format, useful for non-sensitive or quasi-identifying data.
2. How does bit twiddling differ from encryption or format-preserving encryption?
Unlike standard encryption, bit twiddling maintains the length and appearance of the original value, allowing the masked data to remain compatible with schema constraints. It is less secure than AES or FPE, but significantly faster and still reversible.
3. What are the use cases for using bit twiddling instead of stronger encryption?
Bit twiddling is ideal when you need fast, reversible masking for lower-risk data. It's especially useful in test environments or for internal use cases where performance matters more than high-level cryptographic strength.
4. Can bit twiddling be used to comply with data privacy regulations?
Yes, when used appropriately for low-risk or quasi-identifying fields, bit twiddling can support compliance efforts by obfuscating data that does not require strong encryption, while still preserving operational usability.
5. How do I apply bit twiddling in IRI FieldShield?
In IRI FieldShield, you can select the ASCII De-ID function from the GUI or scripting interface to apply twiddling to specific fields. This function can be reused, reversed, and audited through FieldShield’s XML logging system.
6. Can twiddled values be reversed back to their original form?
Yes, twiddled values are recoverable using the same configuration, making this method a reversible de-identification option—unlike redaction or traditional hashing.
7. What types of data are best suited for bit twiddling?
Bit twiddling is most appropriate for ASCII-based strings such as names, codes, or identifiers that don’t require high-level encryption but still benefit from de-identification.
8. How does IRI log and audit the use of bit twiddling?
All masking operations—including bit twiddling—are recorded in FieldShield’s XML audit log. This helps track when and how fields were masked, supporting transparency and compliance reporting.
9. Can I use bit twiddling with other masking functions in the same job?
Yes. You can combine bit twiddling with other masking techniques such as redaction, pseudonymization, or encryption within a single job script in FieldShield or IRI Voracity.
10. What should I consider before using bit twiddling for data protection?
You should evaluate the sensitivity of the data, performance needs, and compliance requirements. While bit twiddling is efficient and reversible, it is less secure than cryptographic methods and best used for lower-risk scenarios.
Share this page

Request More Information

Live Chat

* indicates a required field.
IRI does NOT share your information.