# Sophisticated Sybil attacks

**URL:** https://forum.duniter.org/t/sophisticated-sybil-attacks/288
**Category:** Discussion
**Created:** [5 June 2015 18:01 UTC](https://forum.duniter.org/t/sophisticated-sybil-attacks/288 "2015-06-05T18:01:24Z")
**Posts on this page:** 1
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### Author: ![cgeek](https://forum.duniter.org/user_avatar/forum.duniter.org/cgeek/32/279_2.png) [@cgeek](https://forum.duniter.org/u/cgeek)
#### Post date: [22 June 2015 17:44 UTC](https://forum.duniter.org/t/sophisticated-sybil-attacks/288/21 "2015-06-22T17:44:46Z")

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Well, we have talked of these rules again during [last Freedom Money Meeting (5th)](http://ucoin.io/recap-of-the-5th-fmm-4-days-focusing-on-money-systems/), and we concluded 2 things:

- people should be limited in the number of concurrent valid signatures they can issue
- this rule, mixed with the distance rule, implies a maximum size of the community

And we imagined that a community:

- requiring individuals to gather `8` signatures to be a member
- requiring a maximum distance of `5` between its members
- limiting members to issue `16` concurrent signatures

would lead us to a maximum size of ~1 million people community. Possibly a bit more, but mathematical max is ~2 million.

For comparison, Google is composed of 50.000 people.

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