H33 provides GDPR-compliant data protection built on post-quantum cryptography. Personal data is processed inside fully homomorphic encryption, protected by three independent mathematical hardness assumptions, and governed by deterministic audit trails that satisfy every GDPR technical requirement at the strongest available cryptographic level.
The General Data Protection Regulation (GDPR) establishes comprehensive requirements for the processing, storage, and transfer of personal data belonging to individuals in the European Union. H33's infrastructure addresses these requirements not through policy documents alone, but through cryptographic enforcement at the infrastructure level.
Traditional approaches to GDPR compliance rely on access controls, organizational policies, and periodic audits. These measures create a gap between what an organization claims it does with personal data and what it actually does. H33 eliminates this gap by making GDPR compliance a property of the cryptographic system itself.
When personal data enters H33's pipeline, it is immediately encrypted using Fully Homomorphic Encryption (FHE). From that point forward, all processing occurs on ciphertext. The H33 infrastructure never sees, stores, or logs plaintext personal data. This is not an access control policy that can be circumvented by an administrator -- it is a mathematical property of the encryption scheme. An insider threat, a compromised server, or a stolen backup yields only ciphertexts that are computationally infeasible to decrypt without the client-held key.
Every data processing operation generates a post-quantum signed attestation through H33-74, H33's 74-byte attestation standard. These attestations create a tamper-proof, cryptographically verifiable record of every action taken on personal data: when it was processed, what operation was performed, and what the result was. This chain of attestations serves as the technical foundation for GDPR accountability requirements, providing evidence that is independently verifiable by any third party without trusting H33 infrastructure.
H33 uses three independent post-quantum signature families for all attestations and data protection: ML-DSA-65 (NIST FIPS 204, lattice-based), FALCON-512 (NTRU lattice-based), and SLH-DSA-SHA2-128f (stateless hash-based). Protection breaks only if MLWE lattices, NTRU lattices, AND stateless hash functions are simultaneously compromised -- three independent mathematical hardness assumptions. This ensures that personal data protection remains intact even against future quantum computing capabilities, a critical consideration given GDPR's implicit requirement that data protection measures remain effective for the foreseeable future.
GDPR Article 5 establishes the foundational principles for all personal data processing: lawfulness, fairness, transparency, purpose limitation, data minimization, accuracy, storage limitation, integrity, confidentiality, and accountability. H33 enforces these principles through technical architecture, not just policy.
H33's FHE pipeline processes only the encrypted data necessary for the requested computation. The system does not retain intermediate values, logs, or metadata beyond what is required for the current operation. Because processing occurs on ciphertext, even the data that is retained is mathematically unintelligible without the client-controlled decryption key. The H33 Privacy Layer enforces these boundaries at the protocol level: the system cannot retain more data than the cryptographic protocol permits.
Every processing operation produces a post-quantum signed attestation that cryptographically binds the input, output, and operation together. This attestation chain provides a mathematical guarantee of data integrity that is independently verifiable without trusting H33 infrastructure. Confidentiality is enforced by FHE: data remains encrypted throughout the entire processing pipeline, and H33 infrastructure never has access to decryption keys.
H33-74 attestations create an immutable, cryptographically verifiable record of every data processing event. These records satisfy GDPR's accountability principle by providing evidence that is stronger than traditional audit logs: each attestation is post-quantum signed, timestamped, and chained to previous operations, making retroactive modification computationally infeasible. Regulators, auditors, and data subjects can independently verify these records using H33's open verification standard.
When a data subject requests erasure of their personal data, H33 implements cryptographic deletion that goes beyond simple record removal.
H33 implements the right to erasure through a dedicated account-delete API endpoint. When invoked, the system executes a multi-step cryptographic deletion process that ensures personal data is not merely marked as deleted, but rendered permanently unrecoverable.
The deletion process operates as follows: First, all encryption keys associated with the data subject are cryptographically shredded. This means that even if ciphertext fragments exist in backups, distributed caches, or replicated storage, they are permanently unrecoverable -- the mathematical relationship between the ciphertext and any meaningful plaintext is irrevocably destroyed. Second, all H33-74 attestations associated with the data subject are pruned from active indices while a tombstone attestation is generated. This tombstone serves as cryptographic proof that the deletion was executed, when it occurred, and that it was completed successfully.
The tombstone attestation is itself post-quantum signed, providing evidence that can be presented to regulators or auditors years after the deletion occurred. This solves a fundamental tension in GDPR compliance: how do you prove you deleted data without retaining the data? H33's approach generates a verifiable proof of deletion that contains no personal data.
For organizations that need to demonstrate erasure compliance at scale, H33's API returns a structured response including the tombstone hash, the timestamp, and the signature verification data. This can be stored in the organization's own compliance records as independently verifiable evidence of Article 17 fulfillment.
DELETE /api/v1/account/{subject_id}
Response:
{
"status": "erased",
"subject_id_hash": "sha3_256(subject_id)",
"tombstone_hash": "a4f9c2...",
"erased_at": "2026-05-18T12:00:00Z",
"pq_signature": "ML-DSA-65 + FALCON-512 + SLH-DSA",
"verification_url": "/verify/{tombstone_hash}"
}
Data subjects have the right to obtain rectification of inaccurate personal data. H33 implements this through a cryptographically attested profile-update mechanism.
H33's profile-update endpoint allows data subjects (or their authorized controllers) to modify personal data while maintaining a complete, tamper-proof chain of custody. When a rectification request is processed, the system generates a new H33-74 attestation that cryptographically links the previous state, the rectification request, and the new state into a single verifiable record.
This approach provides several GDPR-specific benefits. First, it creates an auditable record that the rectification was performed, satisfying accountability requirements. Second, the cryptographic chain ensures that the rectification cannot be silently reverted -- any modification to the chain would invalidate all subsequent attestations. Third, the previous state is cryptographically superseded but remains available for dispute resolution if needed, with access governed by the data controller's key management policy.
For organizations processing personal data through H33's FHE pipeline, rectification operates on encrypted data. The data controller submits the corrected data (encrypted under their FHE key), and H33's infrastructure replaces the encrypted record without ever seeing the plaintext content. The attestation chain records that a rectification occurred, when, and by whose authority, without revealing the actual data values.
Data subjects have the right to obtain confirmation of whether personal data concerning them is being processed, and access to that data along with supplementary information.
H33's dsar-export endpoint generates a comprehensive, machine-readable export package containing all personal data associated with a data subject. The export includes the data itself (encrypted under the requesting party's key), a complete chain of all processing attestations, metadata about each processing operation (purpose, legal basis, timestamp), and a manifest signed by all three post-quantum signature families.
The DSAR export is designed to satisfy Article 15's requirements comprehensively. It includes not just the personal data, but information about the purposes of processing, the categories of data, the recipients, the retention period, and the existence of automated decision-making. Each piece of information in the export is individually attested by H33-74, creating a package that the data subject can independently verify for completeness and integrity.
For organizations handling high volumes of DSARs, H33's API supports batch processing with configurable export formats (JSON, CSV, PDF) and automated delivery via webhook. Response times are governed by H33's H33-74 attestation pipeline, which processes attestations at microsecond latency, making even complex DSAR exports available in seconds rather than the days or weeks typical of manual DSAR processes.
GDPR Article 25 requires that data protection be integrated into the design of processing systems. H33's architecture implements this at the deepest possible technical level: Fully Homomorphic Encryption.
Fully Homomorphic Encryption (FHE) is the strongest possible implementation of data protection by design. With FHE, personal data is encrypted before it enters the processing pipeline, and all computation occurs directly on the ciphertext. The system produces encrypted results that only the data controller can decrypt. At no point does H33 infrastructure, any H33 employee, any operating system process, or any hardware component ever access plaintext personal data.
This is fundamentally different from traditional encryption-at-rest or encryption-in-transit approaches, which decrypt data for processing. In those systems, personal data exists in plaintext in memory during computation -- creating a window of vulnerability that insider threats, memory-scraping malware, or side-channel attacks can exploit. H33's FHE approach closes this window entirely. The data is never decrypted during processing. Period.
H33 provides four FHE engine tiers to match different processing requirements: H33-128 (BFV) for integer arithmetic on encrypted data, H33-256 for NIST Level 5 security, H33-CKKS for approximate arithmetic on encrypted floating-point data, and H33-TFHE for gate-by-gate Boolean circuits on encrypted bits. Each engine implements data protection by design at the mathematical level, not the policy level.
Article 25 also requires data protection by default. H33 implements this by making encryption the default state for all data entering the system. There is no unencrypted processing mode. There is no option to bypass FHE for performance. The default configuration is the maximum-security configuration. Organizations using H33 satisfy Article 25 automatically -- they do not need to configure, enable, or audit data protection features because encryption is the only mode of operation.
GDPR Article 32 requires appropriate technical and organizational measures to ensure a level of security appropriate to the risk. H33 implements the strongest available cryptographic measures for each security function.
All personal data is protected by FHE (lattice-based, quantum-resistant). Key exchange uses ML-KEM-1024 (NIST FIPS 203, NIST Level 5). Data integrity is protected by SHA3-256 with domain-separated hashing.
All attestations, audit records, and data integrity proofs are signed by three independent post-quantum signature families. An attacker must simultaneously break MLWE lattices, NTRU lattices, AND stateless hash functions to forge a single signature -- three independent mathematical hardness assumptions.
H33's ZK-STARK engine enables verification of data processing correctness without revealing the underlying data. This allows auditors and regulators to verify GDPR compliance without accessing the personal data being protected, creating a separation between verification authority and data access that traditional audit approaches cannot achieve.
Every security-relevant event generates a cryptographic attestation through H33-74. These attestations are deterministic, independently reproducible, and anchored to external chains (Bitcoin, Solana) for tamper-evidence. The governance attestation system provides Article 32 evidence that is stronger than any traditional log-based approach: attestations are signed, chained, and independently verifiable by any party.
A summary of H33's cryptographic infrastructure and how each component supports GDPR compliance requirements.
| Technology | GDPR Function | Implementation |
|---|---|---|
| Fully Homomorphic Encryption | Data protection by design (Art. 25) | BFV, CKKS, TFHE engines -- compute without decryption |
| Post-Quantum Signatures | Integrity & accountability (Art. 5, 32) | ML-DSA-65 + FALCON-512 + SLH-DSA three-key bundle |
| ZK-STARK Proofs | Verification without exposure (Art. 32) | Prove processing correctness without revealing data |
| H33-74 Attestation | Audit trail (Art. 5, 30) | 74-byte PQ-attested record for every processing event |
| Cryptographic Deletion | Right to erasure (Art. 17) | Key shredding + tombstone attestation |
| DSAR Export | Right of access (Art. 15) | Complete attested export via dsar-export endpoint |
| Profile Update Chain | Right to rectification (Art. 16) | Attested update with cryptographic chain of custody |
| ML-KEM-1024 | Secure key exchange (Art. 32) | NIST Level 5 post-quantum key encapsulation |
| External Chain Anchoring | Tamper-evidence (Art. 5) | Bitcoin mainnet + Solana attestation anchoring |
H33 provides configurable data residency to support GDPR requirements for data localization and cross-border transfer restrictions.
GDPR Chapter V imposes restrictions on the transfer of personal data outside the European Economic Area (EEA). H33 addresses these requirements through configurable processing regions and the inherent properties of FHE-based processing.
When an organization configures H33 for EU data residency, all encryption keys are generated within EU infrastructure, all FHE computation occurs on EU-hosted instances, and no ciphertext leaves the configured region without explicit authorization. The H33-74 attestation chain records the processing region for every operation, providing cryptographic proof of data localization that can be independently verified.
H33's FHE architecture also provides a novel approach to cross-border processing: because data is encrypted under FHE before it enters the pipeline, the "personal data" in the GDPR sense (i.e., data that relates to an identifiable natural person) never crosses borders. What crosses borders is ciphertext that is computationally indistinguishable from random noise without the decryption key. This creates a strong technical argument that FHE-processed data transfers may fall outside the scope of Chapter V restrictions, though organizations should consult their own legal counsel on this interpretation.
For organizations requiring the highest level of data residency assurance, H33 offers dedicated processing instances with customer-managed encryption keys, ensuring that H33 itself cannot access personal data even in theory. This configuration satisfies the most stringent interpretations of GDPR data localization requirements.
A comparison of how traditional approaches and H33's cryptographic infrastructure address core GDPR requirements.
| GDPR Requirement | Traditional Approach | H33 Cryptographic Approach |
|---|---|---|
| Data protection during processing | Access controls, network segmentation, encrypted at rest | FHE: data never decrypted during processing |
| Audit trail integrity | Append-only logs, SIEM, log forwarding | PQ-signed attestation chain, externally anchored |
| Proof of deletion | Deletion logs, manual attestation letter | Cryptographic tombstone, PQ-signed proof |
| DSAR fulfillment | Manual data extraction, 30-day response | Automated export, microsecond attestation |
| Quantum resilience | None -- RSA/AES vulnerable to quantum attack | Three PQ families, three hardness assumptions |
| Independent verification | Trust the audit firm, trust the vendor | Any party can verify -- no trust required |
| Data minimization enforcement | Policy-based, manual review | Protocol-enforced: FHE limits data exposure |
| Cross-border transfer protection | SCCs, BCRs, adequacy decisions | FHE ciphertext: no personal data in transit |
H33 implements right to erasure through a dedicated account-delete API endpoint. When invoked, it cryptographically shreds all associated encryption keys, rendering any retained ciphertexts permanently unrecoverable. A post-quantum signed attestation is generated as proof of deletion, providing a verifiable audit trail that satisfies GDPR Article 17 requirements.
Yes. H33's Fully Homomorphic Encryption (FHE) engines allow computation on encrypted data without decryption. Personal data remains encrypted throughout the entire processing pipeline. H33 infrastructure never sees plaintext personal data, which satisfies GDPR Article 25 data protection by design requirements at the strongest possible technical level.
H33 uses three independent post-quantum signature families: ML-DSA-65 (NIST FIPS 204, lattice-based), FALCON-512 (NTRU lattice-based), and SLH-DSA-SHA2-128f (stateless hash-based). Data protection breaks only if MLWE lattices, NTRU lattices, AND stateless hash functions are simultaneously compromised -- three independent mathematical hardness assumptions.
H33 provides a dedicated dsar-export API endpoint that generates a complete, machine-readable export of all personal data associated with a data subject. The export is post-quantum signed to ensure integrity and authenticity, and includes a cryptographic chain linking every processing event back to its origin. This satisfies GDPR Article 15 right of access requirements.
H33 acts as a data processor when handling customer data through its API and platform services. H33 provides a Data Processing Agreement (DPA) that defines the scope, purpose, and duration of processing, sub-processor obligations, and data subject rights procedures. The DPA is available at h33.ai/dpa/ and can be executed as part of enterprise onboarding.
Stop relying on policies. Start enforcing data protection with mathematics. Post-quantum encrypted processing, cryptographic audit trails, and verifiable deletion.