On 04/02/2017 03:33 AM, Arnaud Venturi wrote: > I could not think of any security or interoperability issue with this > proposal, the only drawback I can see being the slight complexity added > in ClientHello parsing.
The ClientHello message needs to be interpreted in the same way by TLS servers running all versions of TLS. A TLS 1.0 server would not know to use the changed interpretation of the fields and would fail to negotiate a connection. Basically, no change in the format is possible while preserving the backwards and forwards compatibility of version negotiation. -Ben
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