Zcash developers are moving to enhance network security by planning to introduce quantum-resistant, hash-based signature support in January. This development aims to address the growing concern over quantum computing threats that could compromise existing cryptographic standards for cryptocurrencies.
Quantum-resistant security measures
Roman Akhtariev, an engineer working on Zakura, a key implementation for running the Zcash protocol and validating transactions, detailed the upcoming initiative in a recent post. According to Akhtariev, the team expects to include post-quantum signature opcodes for Zcash in January, although no date for network activation has been finalized.
The planned upgrade would introduce opcodes enabling Zcash to validate hash-based signatures. These cryptographic methods are specifically designed to resist attacks by quantum computers, which could one day render conventional public key cryptography vulnerable.
Akhtariev wrote that the team aims for these post-quantum signature capabilities to be included in January, and emphasized the move is meant to strengthen network defenses against future quantum threats.
The update focuses on preventing potential attackers from using public keys to reverse engineer and forge transaction approvals, a threat considered more likely in the era of advanced quantum computing.
The mechanism involves producing a signature verifiable through hash functions, rather than just using public keys. This approach helps ensure that even if current wallet keys are compromised, breaking the hash-based system would require a separate and substantial breakthrough.
A standard Zcash transparent address already conceals the public key using a hash until the funds are spent, after which the key is revealed. This new signature approach would add an extra safeguard for transaction approvals once made public.
These security improvements are partly in response to recent warnings from Ethereum researcher Justin Drake, who argued that artificial intelligence might accelerate the discovery of methods to break bitcoin and ether wallet security. Drake suggested that such risks could be realized “in months, not years” in a worst-case scenario.
The Ethereum network itself has a target date of December 2029 for implementing quantum-resistant cryptographic upgrades. However, to date, no practical attacks on its wallet keys have been recorded.
Following Drake’s statements, ZEC, the native token of Zcash, closed Thursday at around $1,185, registering an 11% decline over the previous week and leading declines among major digital assets.
| Network | Quantum-Resistant Upgrade Target |
|---|---|
| Zcash | January (planned for signatures, activation pending) |
| Ethereum | December 2029 (target for broader upgrade) |
Private lookup tools and transparent pool focus
As most public ZEC tokens reside in transparent addresses, Zakura has also developed a private lookup tool to address privacy risks for users who manage multiple addresses. The tool enables wallets to verify balances without revealing linked addresses to the querying server.
The experimental private lookup feature, available in the Vizor wallet, allows users to check balances across many addresses while preserving privacy and preventing address linkage, even though their payments remain publicly accessible.
Using a method called private information retrieval, the tool ensures that database queries do not expose which records are being accessed, helping prevent server-side address correlation.
Mini dictionary: Private information retrieval, a cryptographic protocol that permits a user to retrieve a record from a database without revealing which record is being accessed, thereby protecting queries from being linked to specific data holders.
Zcash’s network is divided into transparent and shielded payment pools. While shielded payments completely obscure sender, recipient, and amount, transparent transactions function similarly to bitcoin, displaying all transaction details on the blockchain.
CoinDesk’s analysis of ZecStats data suggests that as of Thursday, around 11.96 million out of 16.98 million issued ZEC—roughly seven out of ten coins—resided in transparent addresses. The upcoming quantum-resistant upgrade will concentrate on this public side of the network.
| Type of Address | Amount of ZEC (million) | Share of Total Supply |
|---|---|---|
| Transparent | 11.96 | 70% |
| Shielded | 5.02 | 30% |
Wallets use a private key to approve transactions and a corresponding public key for network verification. Typically, reversing a public key to obtain the secret key is computationally impractical, but experts warn that emerging quantum and AI-driven techniques could change this assumption.
Shielded pool and future plans
While the January upgrade will focus primarily on transparent addresses, the shielded pool requires separate research and development for quantum protection. There is concern that if an adversary were to collect encrypted payment history today, they might eventually decrypt it if cryptographic breakthroughs occur in the future.
The Zcash community and its developers are now prioritizing both privacy enhancements and upgraded cryptography to address evolving risks in the digital asset landscape.
