Zero-Knowledge Security

GSC Share

True zero-knowledge encrypted file sharing. Your files. Your keys. Your control. Always.

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At a glance

True zero-knowledge

We can't access your files—by design, not policy.

URL fragment keys

Encryption keys never touch our servers.

EU data sovereignty

Helsinki, Nuremberg and Falkenstein data centers only.

Self-hosted option

Deploy on your own infrastructure.

The File Sharing Security Paradox

How Zero-Knowledge Actually Works

The URL fragment architecture that makes true privacy possible

https://share.gosec.cloud/d/abc123#AES256_ENCRYPTION_KEY

This part never reaches our servers

Enterprise-Grade Capabilities

AES-256-GCM Encryption

Military-grade authenticated encryption via WebCrypto API.

URL Fragment Keys

Keys embedded in URL fragments—never server-transmitted.

Expiring Links

Set expiration from 1-30 days. Files auto-delete after.

Download Limits

Control maximum downloads per file.

One-Time Downloads

Auto-delete after first successful download.

User Dashboard

Track uploads, monitor downloads, manage shares.

Enterprise SSO

Keycloak OIDC integration with your identity provider.

Storage Quotas

Per-user quotas with usage tracking.

From Upload to Secure Delivery

Step 1

Upload

Select file, set expiration and download limits.

Step 2

Encrypt

Browser encrypts with AES-256-GCM before upload.

Step 3

Copy the link—it contains everything needed.

Step 4

Decrypt

Recipients decrypt locally and download.

How GSC Share Compares

Feature	GSC Share	Traditional Solutions
True Zero-Knowledge	Yes	No
URL Fragment Keys	Yes	No
Self-Hosted Option	Yes	No
EU Data Residency	Yes	Limited
Enterprise SSO (OIDC)	Yes	Limited
Expiring Links	Yes	Yes
Download Limits	Yes	Limited
Auto-Delete After Download	Yes	Limited
GDPR Compliant	Yes	Limited

Built for Regulated Industries

Trusted by organizations where confidentiality isn't optional

Legal Professionals

Protect attorney-client privilege with technical guarantees. Demonstrable protection for privileged materials.

Healthcare Organizations

Share PHI/PII with HIPAA and GDPR compliance. EU data residency satisfies territorial requirements.

Financial Services

Meet bank secrecy and SEC requirements. Self-hosted keeps data within your regulated perimeter.

Government & Public Sector

NIS2-ready with on-premises deployment. No external dependencies for sensitive materials.

Creative Agencies

Protect unreleased work and IP. Platform operators cannot preview your creative assets.

Mergers & Acquisitions

Secure virtual data rooms for due diligence. Time-limited access with download tracking.

Security Architecture

Defense in depth with zero-trust principles

Client-Side Encryption

AES-256-GCM via WebCrypto API

Key Distribution

URL fragment (client-side only)

Data at Rest

Encrypted blobs only (S3/Ceph)

Audit Logging

Privacy-preserving (IP/UA hashed)

What we cannot access:

File contents, file names, file types, or encryption keys. Even if subpoenaed, we can only produce encrypted blobs without decryption capability.

Compliance & Certifications

GDPR

Compliant

Zero-knowledge = no personal data processing for file contents

NIS2

Ready

Supply chain security with self-hosted option

HIPAA

Compatible

BAA available for healthcare deployments

SOC 2

In Progress

Audit trail and access controls implemented

Ready for True Zero-Knowledge File Sharing?

Share confidentially. Control absolutely. Trust no one but yourself.

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