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Why Cloud Key Sovereignty Matters

Cloud adoption is accelerating in every organisation — but so are concerns around data privacy, regulatory pressure, and foreign jurisdiction laws like the U.S. CLOUD Act.

Even when data is stored locally (e.g., in Swiss or EU datacenters), cloud providers may still be legally required to hand over content.

You don’t need to leave Microsoft 365 or AWS to regain control. You only need to own the keys.

Cloud Key Sovereignty ensures that your data remains encrypted with keys the cloud provider can never access.

 

Two Paths to Retaining Control

Below are the two most effective methods used by regulated industries, governments, and security-sensitive organizations.

Double Key Encryption (DKE) for Microsoft 365

Keep Microsoft from ever accessing your confidential documents. DKE encrypts sensitive files using two independent keys, one key stored in your Securosys HSM (never shared with Microsoft) and the other held by Microsoft.

A document can only be decrypted if both keys are available — meaning Microsoft cannot access your protected content.

Securosys expands Microsoft’s reference implementation with:

  • Hardware-backed keys stored in FIPS 140-2 L3 & CC EAL4+ HSMs

  • A more robust, enterprise-ready design

  • Seamless integration with Microsoft 365 Purview

  • A user-friendly DKE Console for key management and auditing

End users simply select a sensitivity label—encryption happens automatically.

Learn more about DKE 

 

Bring Your Own Key (BYOK) for Azure, AWS XKS & Salesforce

Use your own HSM-generated keys across cloud services. With BYOK, encryption keys are generated in your Securosys Primus HSM and stored outside the cloud provider. Only then, are they imported securely into Azure, AWS, or Salesforce. You have the full control over your keys at all times

Securosys BYOK provides:

  • True random key generation (TRNG)

  • Full lifecycle control (create, rotate, revoke, delete)

  • Compliance with strict industry regulations

  • Integration using command-line tools and documented procedures

For AWS, Securosys supports External Key Store (XKS), allowing KMS to use keys stored in your HSM via a secure, customer-hosted XKS proxy—ensuring AWS never sees your private key material.

 

Learn more about BYOK 

Why organizations choose Securosys?

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Swiss-Grade Security
All keys are generated and stored inside FIPS 140-2/3 Level 3 and Common Criteria EAL4+ certified Primus HSMs, ensuring a hardened hardware boundary for maximum protection.
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Cloud & On-Prem Deployment
Deploy as CloudHSM, on-prem HSM, or hybrid clusters. Seamlessly integrate across Microsoft 365, Azure, AWS, Salesforce, and multicloud infrastructures.
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True Key Ownership
Keys are never exposed to cloud providers. You retain full life-cycle control — generation, rotation, deletion — guaranteeing data sovereignty and compliance.
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Compliance-Ready Architecture
Meet the strictest regional and industry regulations with certified hardware, continuous auditing, and multi-authorization enforcement for controlled key access.
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High Availability, Globally
Designed for uninterrupted operations with clustering, geo-redundancy, and 24/7 cloud service availability—supporting mission-critical workloads.
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Post-Quantum Future-Proofing
Native support for NIST-selected PQC algorithms ensures long-term cryptographic resilience and a smooth transition to hybrid and post-quantum security models.