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The “.5” reminds us that perfect decentralization is rarely practical—but a creative half-step can be infinitely better than full surveillance. ZK Research Unit, Anonymous Institute for Cryptography (AIC) Next steps: Prototype implementation in Rust using arkworks and libsnark .
Document ID: ZKA-3.5-PUB-2024 Classification: Conceptual Architecture / Pre-Standardization Whitepaper Date: April 14, 2026 1. Executive Summary The convergence of Zero-Knowledge Proofs (ZKPs) with traditional Public Key Infrastructure (PKI) has long been a goal for privacy-preserving authentication. The hypothetical zkAccess 3.5 framework introduces a novel public key primitive that allows a prover to demonstrate possession of a valid access credential for a resource without revealing the credential itself, the specific policy rule triggered, or the timestamp of access . zk access 3.5 public key
Unlike version 3.0 (which required paired setup phases), introduces a lazy verification public key —a key that exists on a blockchain or distributed ledger but whose corresponding private key is never fully assembled by any single entity. Instead, it is fragmented using Shamir’s Secret Sharing (threshold t=3.5 → meaning 4-of-7 shares required). 2. The “3.5” Meaning The version number is not arbitrary: The “
| Component | Interpretation | |-----------|----------------| | | Three core primitives: Setup, Prove, Verify | | .5 | Half-step beyond full threshold – “verification without reconstruction” – plus inclusion of a semi-trusted aggregation layer (neither fully centralized nor fully trustless) | Instead, it is fragmented using Shamir’s Secret Sharing
In cryptographic terms, 3.5 indicates that the is active at all times, but the ability to issue new access proofs requires a 3.5-out-of-N multi-party computation (MPC), where 3 full participants plus a “half-signature” from a time-based oracle are required. 3. The zkAccess 3.5 Public Key: Anatomy A zkAccess 3.5 public key is not a single (n, e) RSA-style key. It is a compound structure :
