Algorand Unveils Comprehensive Quantum-Secure Ledger Strategy

Algorand has announced a comprehensive plan to safeguard its ledger against potential quantum threats. The strategy focuses on migrating account control to post-quantum solutions, ensuring that both historical blockchain data and live accounts are protected.

The company's approach is divided into three stages: securing the past, present, and future of the ledger. To address this challenge, Algorand will implement State Proofs, which were introduced in 2022 using Falcon signatures to make historical attestations quantum-resistant. The next milestone, scheduled for November 2025, aims to secure MainNet transaction authorization using Falcon through account abstraction.

However, the company acknowledges that securing live accounts is a more complex task than protecting historical data. This requires removing quantum-vulnerable control paths from every account type, including single-signature, Logic Signature, Application, and multisignature accounts. Each of these account types necessitates its own migration strategy, with Falcon, salting, typing, and gradual opt-in adoption being central to the process.

The ultimate goal is to transition to native post-quantum accounts, where Falcon will become a first-class protocol primitive. This shift raises compatibility concerns due to the larger size of Falcon public keys compared to Algorand's 32-byte address format. To mitigate this issue, the company plans to adopt hash-based derivation and verification design.