Cardano (ADA) has been ranked second on an inventory of blockchains that has the potential to withstand any future quantum-computer assaults. In a paper from Google Quantum AI shared by Cardano consultant dori, she notes that the rating was primarily based on how ready blockchains had been to improve to “post-quantum cryptography.”
Cardano secures second place as Algorand leads
Notably, the rating thought of blockchains primarily based on whether or not public keys had been uncovered and if the protocol helps key rotation or upgrades. It additionally factored in how lengthy transactions keep susceptible earlier than they’re confirmed on the blockchain.
As per the rating, Algorand is the one blockchain forward of Cardano as a result of it has already examined quantum-resistant transactions in a dwell atmosphere and helps rotating keys. This suggests that if quantum threats had been to floor now, solely Algorand, theoretically, has the infrastructure emigrate its customers to safer cryptography.
🧵Quantum Safety Rating primarily based on the Google Quantum AI paper (summarized with Claude):
[Tier 1 – Leading the pack]
– AlgorandThe one main chain that has already executed a quantum-resistant transaction in manufacturing. Helps native key rotation and has made post-quantum… pic.twitter.com/koJM2Khr1Q
— dori (@dori_coin) April 1, 2026
Cardano, for its half, is taken into account secure by design, because it hides public keys longer than different blockchains. Cardano makes use of the eUTXO mannequin, the place spending keys stay hashed till funds are spent. This design confers a stage of safety on customers within the ecosystem.
The function prevents any potential attacker from seeing the important thing till the transaction happens. Different tasks on this stage with Cardano embrace Dogecoin, Zcash and Bitcoin Money. All of them have been termed “tier 2” by the Google Quantum AI paper. That’s, they’re structurally in comparison with different blockchains.
In the meantime, the paper has two different classes of blockchain, described as “susceptible however making ready” and “broadest assault floor.” XRP Ledger, Litecoin and Bitcoin fall into the “susceptible however making ready” class.
The networks of those blockchains usually expose public keys extra usually, which doubtlessly leaves them open to quantum attackers.
Ethereum and Solana are thought of to have the broadest assault floor as a result of their public keys are at all times seen. This flaw presents quantum attackers excessive alternatives to strike.
Cardano’s preparedness for post-quantum safety
It’s price mentioning that the analysis paper is decoding blockchains primarily based on future projections, as quantum computer systems that may break the cryptography of networks that don’t exist but. They continue to be a future risk, which some analysts take into account is over 10 years away.
Moreover, most blockchains are already planning upgrades through forks earlier than the menace occurs. As an example, the Ethereum Basis says it’s actively planning a quantum-safe migration round 2029.
Curiously, Cardano Midnight’s Chief Expertise Officer, Sebastian Guillemot, in October 2025, assured customers that the platform is secure from quantum laptop threats. This indicators that the Cardano blockchain has been proactively making ready forward of future potential threats.
