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PII Re-hydration: Zero-Trust Data Protection for LLMs

Gilad GabayJanuary 5, 20261 min read

How SharkRouter ensures your sensitive data never reaches external LLM providers. A technical look at tokenization and secure storage.

PII Re-hydration: Zero-Trust Data Protection for LLMs

One of the biggest concerns enterprises have with AI adoption is data privacy. SharkRouter PII Re-hydration system solves this with a zero-trust approach.

How It Works

1. PII Detection

We scan for 17 types of sensitive data:

  • Email addresses
  • Phone numbers
  • Credit card numbers
  • Social Security Numbers
  • Names and addresses
  • Medical IDs

2. Tokenization

Each detected PII entity is replaced with a secure token.

3. LLM Processing

The tokenized prompt is sent to the LLM - they never see real PII.

4. Re-hydration

When the response comes back, we replace tokens with original values.

Security Properties

  • Zero Trust: LLM providers never see real PII
  • Ephemeral Tokens: 5-minute TTL, then purged
  • Encrypted Storage: AES-GCM with per-client keys
  • Audit Trail: Every tokenization/rehydration is logged
#pii#privacy#zero-trust
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Gilad Gabay

Co-Founder & Chief Architect

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