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From Stefan Eissing <>
Subject Re: H2 compatible ciphers
Date Sat, 17 Oct 2015 13:37:22 GMT
Yes, I think whatever improvements we make, they need to be open for admin overrides. OTOH
the majority of the deployments will want to have sth like modern/intermediate/old and get
whatever that exactly means delivered by us as regular updates in releases (or via their distros).

Especially with more sites adding https for h2 and hopefully let's encrypt coming online soon.

> Am 17.10.2015 um 11:50 schrieb Reindl Harald <>:
>> Am 17.10.2015 um 11:18 schrieb Kaspar Brand:
>> Another - quite radical - approach would consist of using a whitelist,
>> which consists of a single cipher suite only: given that section 9.2 of
>> RFC 7540 states
>> "Implementations of HTTP/2 MUST use TLS version 1.2"
>> and section 9.2.2 further says
>> "deployments of HTTP/2 that use TLS 1.2 MUST support
>> TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 [TLS-ECDHE] with the P-256
>> elliptic curve [FIPS186]"
>> then "H2Compliance on" would only have to make sure that this exact
>> suite is negotiated. (What this MTI cipher suite also means, IINM, is
>> that you can't run an RFC 7540 h2 compliant server with an ECDSA key
>> only, actually... not sure if that was really an intended effect of this
>> requirement.)
> terrible idea because it would lead to disable new, safer and recommended ciphers in
the future until somebody adds them to the whitelist
> so users (clientside) would have to wait for openssl *and* apache after their browser
has already support and with the current release cycles of all major browsers it's likely
to end that way

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