[OTR-dev] Re: Backwards compatability

[Kjell Braden]

> 
> SMP1Q has slightly different semantics from SMP1, so we intentionally
> made it a different TLV type.  If you pose a question to your buddy Bob
> (who answers it correctly), you will authenticate Bob, but Bob will not
> automatically authenticate you.  If Bob is running 3.1.0, which assumes
> a preshared secret (which does indeed imply mutual authentication), we
> don't want his code to "fall back" to authenticating you when it
> shouldn't, and also, he won't see the question, which will be a subtler
> problem more likely to be overlooked than the authentication window not
> coming up at all.
> 
>    - Ian

I see, I missed the part that the authentication will not be mutual in
SMP1Q, so your way makes perfectly sense now.
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