[Investigation] Krypton Layer - Investigation & Low-Level Design

[isanmaz]

🎯 Objective

Conduct a comprehensive investigation and inception to develop the low-level design (LLD) for the Krypton Layer, building upon the existing high-level architecture.

📋 Background

The high-level design for Krypton has been established by the architecture team. This investigation aims to bridge the gap between architectural vision and implementation by defining detailed technical specifications, component interactions, and implementation strategies.

🔍 Scope

Investigation Areas

• Detailed component design for crypto services (encryption, decryption, key wrapping)
• Internal Versioned Key (IVK) management implementation details
• Algorithm-agnostic encryption layer design
• L2-L4 key hierarchy and rotation mechanisms
• Integration points with CMK (L1 keys) and keystore plugins
• Database schema design for key material storage
• API contract definitions (internal & external)
• Security considerations and threat modeling
• Performance requirements and benchmarking criteria

📦 Deliverables

1. Low-Level Design Document - Detailed technical specifications: Data structure (e.g. keychain structure), Component design, sequence diagram, state machine, interfaces and abstractions. How system works internally
2. Architecture Decision Records (ADRs) - Key design decisions with rationale (if there is any changes)
3. Implementation Backlog - Epics and stories derived from LLD

🔗 Related Resources

• Existing ADRs: documentation/adr/
• Crypto Repository: openkcm/crypto