TL;DR: Zakura has proposed assigning a separate viewing key to every Zcash swap made by NEAR Intents, lowering how a lot transaction historical past a future attacker may be capable to hyperlink.
Zcash’s privateness mannequin is constructed round shielding transaction particulars, however cross-chain swaps introduce awkward factors the place data can turn 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 by NEAR Intents.
A publicly seen deal with will be linked to a pockets’s viewing-key construction. If future cryptographic advances allowed an attacker to get well or exploit that relationship, exposing one deal with might reveal extra of a consumer’s transaction historical past than meant.
Zakura’s proposed reply is to provide every swap its personal viewing key whereas leaving spending authority beneath the consumer’s management. A compromised viewing key would then reveal data associated to at least one swap, fairly than opening a window onto a whole 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 in opposition to Zcash. It’s preventative engineering primarily based on a attainable future danger. The proposal stays beneath evaluate, and supporters haven’t but delivered a extensively deployed answer.
That distinction issues. Good privateness work usually means fixing linkability issues earlier than they turn into exploitable, however safety should nonetheless be applied, audited and adopted by wallets earlier than it advantages atypical customers.
Written by the Information Desk and edited by Samuel Rae.
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