mailing list archives
Re: Dear RIPE: Please don't encourage phishing
From: Jimmy Hess <mysidia () gmail com>
Date: Sun, 12 Feb 2012 21:52:16 -0600
2012/2/12 Masataka Ohta <mohta () necom830 hpcl titech ac jp>:
Valdis.Kletnieks () vt edu wrote:
So, I can understand your attempt to insist on lowercase,
but it does not work because DNS does not allow it.
Not exactly... DNS is case-insensitive when you are talking about
7-bit ASCII; the set of alphabetic characters that can appear in a
DNS label; with no punycode.
IDN means that non-ASCII characters are represented using punycode.
As soon as you have a browser parsing punycode stuff, any string
containing unicode characters has a unique punycode encoding / RFC
3491 / RFC 3492.
The symbols represented in the punycode encodings are not case sensitive.
Uppercase A-Z vs Lowercase a-z in the generalized variable-length
integers are not distinct,
the punycode representation itself cannot really be case sensitive,
but the codepoint represented by the encoding, the result of decoding
the punycode is case-preserving.