[tor-bugs] #28651 [Obfuscation/Snowflake]: Prepare all pieces of the snowflake pipeline for a second snowflake bridge

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#28651: Prepare all pieces of the snowflake pipeline for a second snowflake bridge
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 Reporter:  arma                   |          Owner:  (none)
     Type:  enhancement            |         Status:  new
 Priority:  Medium                 |      Milestone:
Component:  Obfuscation/Snowflake  |        Version:
 Severity:  Normal                 |     Resolution:
 Keywords:                         |  Actual Points:
Parent ID:                         |         Points:
 Reviewer:                         |        Sponsor:
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Comment (by dcf):

 Another design alternative, requiring changes in core tor: let a bridge
 line describe not just a single bridge fingerprint, but a set of them. The
 client is satisfied if any fingerprint in the set matches. The broker (or
 the proxy) knows the current set of bridges, and randomly selects one
 without any control by the client.

 Adding a new bridge to the set would require pushing out new bridge lines
 to users (i.e., making a new Tor Browser release). But if new bridges are
 only needed to increase capacity, that should be a frequent enough pace.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/28651#comment:2>
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