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kazuho committed Oct 31, 2019
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16 changes: 8 additions & 8 deletions draft-ietf-quic-transport.md
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Expand Up @@ -2794,14 +2794,14 @@ following steps:
alternative initial salt that is to be used for unprotecting the packet
payload.

Instead of associating a new alternative initial salt with every NEW_TOKEN token,
a server might map a fixed salt to each of the alternative version numbers it
issues. Such design is not recommended, as an active attacker might build a
list of known alternative version numbers and their initial salts and use that
list to decrypt the payload of Initial packets using those alternative version
numbers. But still, having a set of version numbers and initial salts used
concurrently is considered better than just using the default values of QUIC in
terms of preventing ossification.
Instead of associating a new alternative initial salt with every NEW_TOKEN
token, a server might map a fixed salt to each of the alternative version
numbers it issues. Such design is not recommended, as an active attacker might
build a list of known alternative version numbers and their initial salts and
use that list to decrypt the payload of Initial packets using those alternative
version numbers. But still, having a set of version numbers and initial salts
used concurrently is considered better than just using the default values of
QUIC in terms of preventing ossification.

A server MUST NOT send a Version Negotitation packet in response to a long
header packet with an alternative version number it has advertised.
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