Sapling Woodchipper

somedude · August 18, 2019, 11:33pm

any comments about this issue?

Autotunafish · August 19, 2019, 12:17am

Yeah, lots of em

github.com/zcash/zcash

Denial of Service

opened 10:38PM - 16 Apr 19 UTC

zebambam

I-dos epic

Scaling discussions don’t make sense unless the ultimate goal is to reduce the l…ikelihood that users will not be able to use Zcash because of a lack of service. There are lots of ways to fill up our service currently. When we spot them, we should link them to this epic. - A small number of shielded transaction of massive size. - A small number of or many transactions with many empty outputs. - Many small transactions filling the mempool currently crash the nodes that receive them. It’s possible to knock nodes offline. Transaction expiry helps reduce the cost for an attacker. Additionally, the failure mode is currently catastrophic. - Filling the mempool currently results in a node crash. With such an attack, someone might be able to knock over mining pool operators, and thus significantly drop the hashpower of the network, facilitating a 51% attack. Suggested course of action: Set limits on the mempool size, and reject further transactions. Other steps that result in the reduction of the likelihood of a successful DoS attack.

(All day Dude)

mistfpga · August 19, 2019, 2:56pm

Damn, was just about to post that.

heh.

tromp · August 19, 2019, 3:41pm

Question: How is the minimum fee required for transaction relay in zcashd dependent on tx size (and possibly other tx properties) ?

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Sapling Woodchipper

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