TL;DR: Zakura has proposed assigning a separate viewing key to every Zcash swap made via NEAR Intents, decreasing how a lot transaction historical past a future attacker would possibly be capable to hyperlink.
Zcash’s privateness mannequin is constructed round shielding transaction particulars, however cross-chain swaps introduce awkward factors the place info can change into public. A brand new proposal from Zcash software program developer Zakura focuses on a type of factors: the refund addresses concerned when shielded ZEC strikes via NEAR Intents.
A publicly seen tackle might be linked to a pockets’s viewing-key construction. If future cryptographic advances allowed an attacker to recuperate or exploit that relationship, exposing one tackle may reveal extra of a consumer’s transaction historical past than meant.
Zakura’s proposed reply is to offer every swap its personal viewing key whereas leaving spending authority beneath the consumer’s management. A compromised viewing key would then reveal info associated to at least one swap, fairly than opening a window onto a complete pockets’s previous.
The design additionally contemplates non-public info 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 in opposition to Zcash. It’s preventative engineering primarily based on a doable future danger. The proposal stays beneath evaluation, and supporters haven’t but delivered a extensively deployed resolution.
That distinction issues. Good privateness work usually means fixing linkability issues earlier than they change into exploitable, however safety should nonetheless be applied, audited and adopted by wallets earlier than it advantages peculiar customers.
Written by the Information Desk and edited by Samuel Rae.
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