<pasi.ero...@nokia.com> writes:

> Simon Josefsson wrote:
>
>> I'd be happy to help work on a document that analyzed the consequences
>> of replacing SASLprep with just-use-RFC5198 in SASL.  But I don't think
>> SCRAM should wait for something like it to materialize.
>
> I agree that such work would take time, and we don't want to delay
> SCRAM.
>
> But as the discussion so far has shown, normalization is a very tricky
> topic, and we can't really expect implementors to understand why "just
> use UTF-8" is problematic. Perhaps we should add a note to the SCRAM
> draft; something like
>  
>    Informative Note: Implementors are encouraged to create test cases
>    that use both username passwords with non-ASCII characters. In
>    particular, it's useful to test characters whose "normalization
>    form C" and "normalization form KC" are different. Some examples of
>    such characters include Vulgar Fraction One Half (U+00BD) and
>    Acute Accent (U+00B4).

+1.

> Do you think this would increase the likelihood of interoperability
> with non-ASCII passwords?

For implementers that decides to use SASLprep but just happens to get
things wrong, yes.  For those, I think test vectors would be even more
useful.

/Simon
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