🔐
Secure Storage
...
⚡
Performance
614ms
🗜️
Total Keys
...
🔢
Algorithms
28
🛡️
NIST 800-88
Compliant
📊
Uptime
99.9%
🛡️
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Advanced Cryptographic Key Management

PostgreSQL-backed secure storage for large FHE keys (... keys, ... total)

28
Algorithms
...
Largest Key
614ms
Large Key Retrieval
...
Compression Ratio

System Overview

Design Principles

  • 🎯 Separation of Concerns
  • 💾 Database-Backed Storage
  • 🔗 Reference-Based Architecture
  • 📋 Complete Audit Trail
  • ♻️ Lifecycle Management

Technology Stack

Application Rust + SQLx
Storage PostgreSQL 15+
Security NIST 800-88

Key Features

TOAST Compression
Adaptive Pooling
Lifecycle Policies
Audit Logging
Cryptographic Shredding
Tamper Detection

Technical Architecture

Client Layer

REST API Requests
UUID References

Application Layer (Rust)

SQLx Async Driver
UUID v4 Generation
Chrono Timestamps

Storage Layer (PostgreSQL)

BYTEA Columns
JSONB Metadata
TOAST Compression
B-tree Indexes

Identity

key_vault key_id UUID PRIMARY KEY algorithm VARCHAR(255) key_type VARCHAR(50)

Key Material (Binary)

key_vault public_key BYTEA private_key BYTEA symmetric_key BYTEA

Lifecycle

key_vault created_at TIMESTAMPTZ expires_at TIMESTAMPTZ revoked_at TIMESTAMPTZ rotation_policy VARCHAR(50)

Access Details

key_vault_access_log accessed_at TIMESTAMPTZ accessed_by VARCHAR(255) operation VARCHAR(50)

Context

key_vault_access_log ip_address INET user_agent TEXT request_id UUID

Result

key_vault_access_log success BOOLEAN duration_ms INTEGER key_size_bytes BIGINT

Performance Metrics

Storage Efficiency

Raw Key Size (... keys)
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TOAST Storage Strategy
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Actual Storage Size
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Compression Ratio
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Query Performance

Operation Time Status
Key Retrieval (114MB) 614ms Excellent
Usage Update 2ms Excellent
Audit Log Insert 1ms Excellent

Scalability Improvements

Storage Strategy
EXTERNAL: Out-of-line, no compression
Optimal for crypto keys (incompressible)
Saves CPU, prevents bloat
Connection Pool
Configuration: Adaptive pool
Range: 5-50 connections
Scales with load
Query Timeout
Limit: 600 seconds
Optimized for large FHE keys
Handles 114 MB keys

Security & Compliance

Access Control

  • Owner-based key isolation
  • JSONB policy enforcement
  • Time-based expiration
  • Usage count limits

Audit Logging

  • Tamper-evident Merkle hashes
  • SHA-256 audit chains
  • Complete access history
  • Forensic analysis ready

Lifecycle Management

  • Automatic expiration checks
  • Revocation enforcement
  • Usage limit tracking
  • Storage tier optimization

Cryptographic Shredding

  • NIST 800-88 compliant
  • 3-pass overwrite (zeros/random/zeros)
  • Automatic on expiration
  • Batch processing (100 keys)
🛡️
NIST 800-88
🔐
GDPR Ready
🏥
HIPAA Compliant
💳
PCI-DSS Aligned

API Integration

1

Key Generation

POST /keys/generate
{
  "algorithm": "post-zk-homomorphic"
}
key_id → ac7ff871-2184-48d4...
→
2

Encryption

POST /encrypt
{
  "algorithm": "post-zk-homomorphic",
  "data": "SGVsbG8...",
  "key_id": "ac7ff871..."
}
encrypted_data → 3.16MB payload
→
3

Decryption

POST /decrypt
{
  "algorithm": "post-zk-homomorphic",
  "data": "PQP...",
  "key_id": "ac7ff871..."
}
decrypted_data → Original plaintext

Technical Specifications

Database Infrastructure

Database PostgreSQL 15+
Driver SQLx 0.7.4 (async)
Connection Pool 5-50 adaptive
Pool Timeout 30s idle / 60s max lifetime
Query Timeout 600s (large keys)

Storage & Compression

Key Storage BYTEA binary columns
TOAST Strategy EXTERNAL (optimal - no compression waste)
Max Key Size 1GB per column
Current Usage 115MB × 10 keys = 1.15GB
Storage Tiers Hot / Warm / Cold / Archive

Data Types & Formats

Identifier UUID v4 (128-bit)
Timestamps TIMESTAMPTZ (TZ-aware)
Metadata JSONB (flexible schema)
IP Addresses INET (IPv4/IPv6)
Arrays TEXT[] (compliance tags)

Performance & Indexing

Primary Index B-tree on UUID
Algorithm Index B-tree on algorithm
Expiration Index Partial B-tree (WHERE NOT NULL)
Avg Retrieval 614ms (114MB key)
Metadata Update ~2ms

Lifecycle Management

Rotation Policies 3mo / 6mo / 12mo / manual
Retention 90d / 1y / 3y / permanent
Shredding NIST 800-88 (3-pass)
Auto Expiration Scheduled task (hourly)
Usage Limits Configurable per key

Security & Compliance

Audit Logging Complete access trail
Tamper Detection Merkle hash chains
Hash Algorithm SHA-256
Compliance GDPR / HIPAA / PCI-DSS
Access Control Owner-based + JSONB policies