3.2 Universal Trust Layer

Most systems have multiple trust mechanisms:

• Passwords for users
• OTPs for admins
• API keys for services
• Secrets for automation

Each mechanism:

• Has different failure modes
• Requires separate security logic
• Expands the attack surface

PTERI removes this duplication

The same cryptographic primitive is reused everywhere:

Sign → Verify

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Where this applies

The exact same flow is used for:

• Login
• Step-up authentication
• Payments
• API authorization
• AI agent execution

There is no conceptual difference between:

• A human logging in
• A service calling an API
• An AI agent executing a task

All are simply authorities proving intent.

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Why this matters

This model:

• Reduces system complexity
• Eliminates entire classes of bugs
• Makes security review tractable
• Scales naturally to automation and AI

One primitive. One verifier. Infinite use cases.