feat(kad): New provider record update strategy #5536
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Mivik
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provided in sync with providers in MemoryStoreprovided in sync with providers in MemoryStore
Former implementations keep provider records sorted by their distance to the key, however this strategy is vulnerable to Sybil attack, in which an attacker can flood the network with false identities in order to eclipse a key. This commit change the strategy to simply keep old providers and ignore new ones. This new strategy however, can cause load imbalance, but can be mitigated by increasing `max_providers_per_key`.
Mivik
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provided in sync with providers in MemoryStore
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guillaumemichel
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Looks good to me! Thanks @Mivik for your contribution!
Can you also add an entry in the changelog and bump the version of kad?
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Sure, should I bump to 0.47.0 or 0.46.1? |
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This is a non-breaking change, so you can bump to |
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In `MemoryStore`, the number of provider records per key is limited by `max_providers_per_key`. Former implementations keep provider records sorted by their distance to the key, and only keep those with the smallest distance. This strategy is vulnerable to Sybil attack, in which an attacker can flood the network with false identities in order to eclipse a key. This commit change the strategy to simply keep old providers and ignore new ones. This new strategy however, can cause load imbalance, but can be mitigated by increasing `max_providers_per_key`. In addition, old implementations failed to keep `provided` and `providers` in sync, and this commit fixes this issue. Pull-Request: libp2p#5536.
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Description
In
MemoryStore, the number of provider records per key is limited bymax_providers_per_key. Former implementations keep provider records sorted by their distance to the key, and only keep those with the smallest distance. This strategy is vulnerable to Sybil attack, in which an attacker can flood the network with false identities in order to eclipse a key.This commit change the strategy to simply keep old providers and ignore new ones. This new strategy however, can cause load imbalance, but can be mitigated by increasing
max_providers_per_key.In addition, old implementations failed to keep
providedandprovidersin sync, and this commit fixes this issue.Change checklist