Zcash, the privacy-focused cryptocurrency, is targeting a full transition to post-quantum cryptography by 2027, a move designed to protect user funds and transaction privacy against a class of computer that does not yet exist at threatening scale but is advancing faster than many in the industry expected.
Josh Swihart, founder and chief executive of the Zcash Open Development Lab (ZODL), the for-profit organisation that now leads core protocol development, outlined the roadmap at the Consensus conference in Miami on Thursday.
The plan has two phases.
Within the next month, Zcash will release quantum-recoverable wallets, a new type of wallet that gives users a way to migrate their funds to safety if the cryptography protecting their current holdings is compromised by a future quantum computer.
These wallets are not themselves quantum-proof; they act as a bridge, allowing users to move assets to stronger protections without being front-run by an attacker who has already broken the existing encryption.
The second phase, targeted for completion within 12 to 18 months, involves replacing the core cryptographic building blocks of the Zcash protocol with algorithms specifically designed to resist quantum attacks.
To understand why this matters, it helps to know what quantum computing threatens.
Almost every cryptocurrency in use today, including Bitcoin, Ethereum and Zcash, relies on a branch of mathematics called elliptic curve cryptography to secure private keys, the secret codes that prove ownership of funds. The security of these systems rests on the assumption that certain mathematical problems are so difficult that no computer could solve them in a useful timeframe.
Quantum computers, which process information using the principles of quantum mechanics rather than conventional binary logic, could eventually solve those problems. An algorithm called Shor's algorithm, published in 1994, showed theoretically that a sufficiently powerful quantum machine could derive a private key from a public key, effectively allowing an attacker to steal funds or forge transactions.
No quantum computer today is powerful enough to do this. But a report this week from quantum security firm Project Eleven warned that so-called "Q-Day," the point at which quantum hardware becomes capable of breaking existing cryptography, could arrive as early as 2030. A researcher recently demonstrated the ability to break a small elliptic curve key using publicly available quantum hardware, a proof of concept rather than a practical attack, but a signal of progress nonetheless.
For Zcash, the stakes are particularly high because the protocol is built around privacy. Its shielded transactions use zero-knowledge proofs, a cryptographic technique that allows a user to prove a transaction is valid without revealing the sender, recipient or amount. If the underlying cryptography is broken, not only could funds be stolen, but the entire history of shielded transactions could be retroactively decrypted, destroying the privacy guarantees users relied on when they made those payments.
This "harvest now, decrypt later" threat, in which an adversary records encrypted data today and waits for quantum hardware to mature, is why Zcash developers view privacy protections as the most urgent priority.
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The project is exploring lattice-based cryptography, a family of algorithms built on mathematical structures called lattices that are believed to be resistant to both classical and quantum attacks. The US National Institute of Standards and Technology (NIST) finalised the first global post-quantum cryptographic standards in August 2024, selecting lattice-based algorithms as primary candidates for encryption and digital signatures.
ZEC, the native Zcash token, has rallied roughly 110% over the past month following a disclosure by Multicoin Capital, a prominent crypto investment firm, that it had taken a significant position in the coin. The token was trading at approximately $579 on Thursday.
The recap
- Zcash is pursuing post-quantum cryptography capability, company said.
- ZEC trades at $579.24, up 1.63% in price list.
- Target milestone set for completion by 2027, per announcement.
