What is Subgraph Citadel?
Subgraph Citadel is an advanced operating system developed to withstand sophisticated cyber threats and provide compartmentalized, adversary resistant computing. Designed for users who require stringent security such as system administrators, software developers, and security researchers, Citadel features a tamper-proof base protected by Linux's dm-verity, making it completely read-only and ensuring the system does not boot if integrity is compromised. Its architecture enables users to create unlimited isolated realms, with each realm operating as an independent environment, preventing breaches from spreading across domains.
Citadel delivers seamless integration between realms, allowing users to maintain productivity while safeguarding sensitive information. Its entire system updates atomically as signed binary blobs, and reproducible builds enable independent verification to prevent supply chain attacks. With a strong foundation in cryptographic protection, hardware security features such as TPM integration, and comprehensive sandboxing using namespaces and hypervisors, Citadel pioneers a security-by-design approach for environments facing targeted attacks and malicious adversaries.
Features
- Tamper Resistant Foundation: Read-only base system protected by dm-verity integrity verification.
- Partitioned Workspaces: Unlimited isolated realms for projects with strong separation of applications and data.
- Seamless Workflow: Different realms can share the desktop interface with clear visual indicators.
- Atomic Updates: Entire base OS updates as a single signed binary and rolls back securely if interrupted.
- Verifiable Supply-Chain: Components are reproducibly built from source for independent verification.
- Integrity Protection: Cryptographic verification ensures system does not boot if modified.
- Defense In Depth: Independently verifiable and secure architectural layers.
- Realm Sandboxing: Complete process, network, and filesystem isolation between realms.
- Immutable Base: No configuration drift or persistent malware due to enforced read-only core.
- Hardware Security: TPM integration and hardware crypto acceleration for enhanced cryptographic protection.
Use Cases
- Securing endpoints for privileged system administrators facing targeted threats.
- Providing isolated development environments to prevent cross-contamination for software developers.
- Enabling safe malware analysis for security researchers.
- Establishing secure workstations for sensitive financial transactions in financial services.
- Supporting compartmentalized computing for classified operations in government environments.
- Powering embedded systems requiring secure computing, such as kiosks and specialized hardware.
FAQs
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What are the hardware requirements for installing Subgraph Citadel?
Subgraph Citadel requires a x86_64 processor with virtualization support (Intel VT-x or AMD-V), at least 8GB of RAM (16GB recommended), and a minimum of 32GB SSD storage (128GB recommended). UEFI Secure Boot is required, and TPM 2.0 is recommended for enhanced security. -
How does Citadel ensure the integrity of its base system?
The base system is enforced as read-only and protected by dm-verity, which cryptographically verifies every block in the filesystem. If any part is tampered with, the system will not boot. -
Can I independently verify the authenticity of Citadel binaries?
Yes, all Citadel binaries are built reproducibly, allowing independent verification that binaries match the published source code, thus eliminating supply chain attacks. -
What methods does Citadel use for isolating different workspaces or projects?
Citadel uses kernel namespaces, cgroups for containers, and a custom hypervisor for hardware-level isolation, ensuring that each realm remains fully separated in terms of process, network, and filesystem.
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