Zcash Developer Proposes Per-Swap Keys To Limit Future Quantum Privacy Risk
TL;DR: Zakura has proposed assigning a separate viewing key to every Zcash swap made by NEAR Intents, decreasing how a lot transaction historical past a future attacker would possibly be capable of hyperlink.
Zcash’s privateness mannequin is constructed round shielding transaction particulars, however cross-chain swaps introduce awkward factors the place data can turn out to be public. A brand new proposal from Zcash software program developer Zakura focuses on a kind of factors: the refund addresses concerned when shielded ZEC strikes by NEAR Intents.
A publicly seen deal with could be linked to a pockets’s viewing-key construction. If future cryptographic advances allowed an attacker to recuperate or exploit that relationship, exposing one deal with might reveal extra of a consumer’s transaction historical past than supposed.
Zakura’s proposed reply is to provide every swap its personal viewing key whereas leaving spending authority underneath the consumer’s management. A compromised viewing key would then reveal data associated to at least one swap, relatively than opening a window onto a complete pockets’s previous.
The design additionally contemplates non-public data retrieval, permitting software program to find related refunds with out broadcasting which addresses a consumer is checking.
This isn’t a response to a demonstrated quantum assault towards Zcash. It is preventative engineering based mostly on a potential future threat. The proposal stays underneath overview, and supporters haven’t but delivered a broadly deployed resolution.
That distinction issues. Good privateness work typically means fixing linkability issues earlier than they turn out to be exploitable, however safety should nonetheless be applied, audited and adopted by wallets earlier than it advantages extraordinary customers.
Written by the News Desk and edited by Samuel Rae.
