> ## Documentation Index
> Fetch the complete documentation index at: https://docs.indic8.ing/llms.txt
> Use this file to discover all available pages before exploring further.

# Zero-PII Sovereign Vault

> Client-side Web Crypto encryption, customer token hashing, and zero raw PII storage.

Traditional analytics tools store customer names, full email addresses, billing addresses, and raw IP addresses, creating severe privacy liabilities and compliance overhead (GDPR, CCPA, SOC 2).

Indic8 is built with a **Zero-PII Sovereign Privacy Vault** architecture.

## How the Vault Operates

```
[Incoming Webhook]
  - Name: "Alex Mercer"
  - Email: "alex@example.com"
  - Card: "**** 4242"
  - Amount: $49.00
           │
           ▼
┌──────────────────────────────────────────┐
│        Sovereign Scrubbing Stage         │
│  - Strip Card Number (0 bytes stored)    │
│  - Strip Full Name & Physical Address    │
│  - Salt + Hash Email -> usr_9f81a7b...   │
│  - Retain Country Code (e.g. "US")       │
└──────────────────┬───────────────────────┘
                   │
                   ▼
┌──────────────────────────────────────────┐
│      Client-Side AES-256-GCM Vault       │
│  - Secrets encrypted with workspace key  │
│  - Decrypted only in user browser memory │
└──────────────────┬───────────────────────┘
                   │
                   ▼
┌──────────────────────────────────────────┐
│         Sanitized Database Record        │
│  - customer_id: "usr_9f81a7b..."         │
│  - country: "US"                         │
│  - amount: 49.00                         │
│  - pii_retained: false                   │
└──────────────────────────────────────────┘
```

***

## Technical Security Specifications

### 1. Zero Credit Card Retention

Indic8 records **0 bytes** of credit card numbers, CVVs, expiration dates, or billing street addresses. Only gross amounts, payment statuses, and country codes are logged.

### 2. One-Way Cryptographic Salt

Customer email addresses are run through an HMAC-SHA256 function keyed by an internal workspace secret:

$\text{Customer Identifier} = \text{HMAC-SHA256}(\text{Salt}_{\text{workspace}}, \text{Email}_{\text{normalized}})$

This provides deterministic cohort tracking across multiple purchases without exposing customer identities.

### 3. Client-Side Decryption via Web Crypto API

For integrations requiring encrypted API credentials (like restricted Stripe keys), keys are encrypted using AES-256-GCM in the user's browser before transmission. Server nodes never retain unencrypted master secrets in plain text.