> For the complete documentation index, see [llms.txt](https://qualitax.gitbook.io/interop/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://qualitax.gitbook.io/interop/requirements/foundational-layer/security-sub-layer/data-privacy.md).

# Data Privacy

**Focus:** Confidentiality, selective disclosure, and control over data and its exposure.

**Objective**: Enable data privacy across interconnected chains. Ensure that sensitive information is protected from unauthorized access, and users or entities have control over their data, in alignment with privacy regulations and standards.

**Description:** Provides protocols, cryptography standards, and access controls to ensure confidential data exchange in cross-chain transactions and communications is protected according to privacy requirements.

**Layer owner:** Developers, industry working groups.

Some key aspects:

* Zero-knowledge proofs and trusted execution
* Encryption standards for data in transit and at rest
* Interoperable permissioning schemes and access controls
* Privacy-preserving smart contracts
* Selective disclosure and data minimization
* Hybrid public/private blockchain integrations
* Anonymous communication channels
* Compliance with regulations like GDPR
* Audit trails for transparency over privacy controls

 Data privacy is fundamental to any commercial solution. 

transactional data privacy.