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martinthomson committed Sep 26, 2014
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Showing 1 changed file with 7 additions and 5 deletions.
12 changes: 7 additions & 5 deletions draft-ietf-httpbis-http2.xml
Original file line number Diff line number Diff line change
Expand Up @@ -3662,14 +3662,16 @@ HTTP2-Settings = token68
<section title="TLS Cipher Suites">
<t>
The set of TLS 1.2 cipher suites that are permitted in HTTP/2 is restricted. HTTP/2
MUST only be used with cipher suites that have ephemeral key exchange, such as the <xref
MUST only be used with cipher suites that permit ephemeral key exchange, such as the <xref
target="TLS12">ephemeral Diffie-Hellman (DHE)</xref> or the <xref
target="RFC4492">elliptic curve variant (ECDHE)</xref>. Ephemeral key exchange MUST
have a minimum size of 2048 bits for DHE or security level of 128 bits for ECDHE.
Clients that offer DHE-based suites MUST accept DHE sizes of up to 4096 bits. HTTP MUST
NOT be used with cipher suites that use stream or block ciphers. Authenticated
Encryption with Additional Data (AEAD) modes, such as the <xref target="RFC5288">Galois
Counter Model (GCM) mode for AES</xref> are acceptable.
Clients that offer DHE-based suites MUST accept DHE sizes of up to 4096 bits.
</t>
<t>
HTTP/2 MUST NOT be used with cipher suites that use stream or block ciphers.
Authenticated Encryption with Additional Data (AEAD) modes, such as the <xref
target="RFC5288">Galois Counter Model (GCM) mode for AES</xref> are acceptable.
</t>
<t>
The effect of these restrictions is that TLS 1.2 implementations could have
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