Cryptographic Proof of Real Human Interaction — Without CAPTCHA

CAIBE is a cryptographic challenge–response system that verifies live,

genuine human interaction at the protocol level — stopping bots,

replay attacks, and scripted abuse without CAPTCHA, biometrics, or user tracking.

FreQuid provides CAIBE as an open, auditable security primitive for modern applications.

The Problem

Modern applications are under constant automated attack:

* Bots bypass CAPTCHA at scale

* Replay attacks exploit static challenges

* Automation frameworks simulate “human behavior”

* Biometric and fingerprinting solutions compromise privacy

* User experience degrades as security increases

Existing solutions trade usability for weak security.

The Solution: CAIBE

CAIBE (Certificate Authority & Idenitty-based Encryption) + (Challenge-

Adaptive Interaction-Bound Encryption) verifies that a request

originates from a live, interactive human session — not from scripts,

bots, or replayed credentials.

Instead of asking users to “prove they’re human,”

CAIBE cryptographically proves interaction authenticity.

Instead of asking users to “prove they’re human,”

CAIBE cryptographically proves interaction authenticity.