The Cloak

Tier 2 Classification ● live

Format-preserving encryption and tokenization. Masks sensitive fields while preserving data utility for analytics.

Tier

Tier 2

Phase

Classification

Pricing

$0.00012 USDC/row

MCP Tool

the_cloak_mask

Dependencies

sentinel-tag

View source on GitHub

What It Does

The Cloak applies format-preserving encryption (AES-FF1) and tokenization to sensitive fields identified by Sentinel Tag. FPE produces output that looks like the original data — a masked credit card number still looks like a credit card number — keeping data analytically useful while protecting sensitive values.

Capabilities

Format-preserving encryption (AES-FF1)
Deterministic tokenization (HMAC-SHA256)
Reversible masking (with key)
Irreversible pseudonymization
Partial masking (show last 4 digits)
Consistent cross-dataset tokenization

Example

the-cloak-example.ts

const result = await mcp.call('the_cloak_mask', {
  payload: classifiedPayload,
  stream_uuid: streamUUID,
  sensitive_fields: sentinelResult.sensitive_fields,
  mode: 'tokenize',
});
// "4532-1234-5678-9012" → "4532-XXXX-XXXX-9012"

Configuration

the-cloak.yaml

agent: the-cloak
version: "1.0"
encryption:
  algorithm: AES-FF1
  key_source: vault
  key_id: "${CLOAK_KEY_ID}"
tokenization:
  algorithm: HMAC-SHA256
  deterministic: true