Truncated HMAC
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... CA root keys it possesses. Section 3.5 describes the extension
that allows the use of truncated HMAC. Section 3.6 describes the
extension that supports integration of certificate status information
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... Truncated HMAC ...
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In order to negotiate the use of 80-bit truncated HMAC, clients MAY
include an extension of type "truncated_hmac ...
... Servers that receive an extended hello containing a "truncated_hmac"
extension MAY agree to use a truncated HMAC by including an extension
of type "truncated_hmac", with empty "extension_data", in the
...
... Finished messages, it is not possible for an active
attacker to force negotiation of the truncated HMAC extension where
it would not otherwise be used (to the extent that the handshake
...
... authentication is secure). Therefore, in the event that any security
problem were found with truncated HMAC in the future, if either the
client or the server for a given session ...