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List:       spamassassin-users
Subject:    Re: RBL format to blacklist email addresses?
From:       John Hardin <jhardin () impsec ! org>
Date:       2015-07-30 3:34:27
Message-ID: alpine.LNX.2.00.1507292033470.571 () athena ! impsec ! org
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On Thu, 30 Jul 2015, Reindl Harald wrote:

>
>
> Am 30.07.2015 um 02:16 schrieb John Hardin:
>>  On Wed, 29 Jul 2015, Bill Cole wrote:
>> 
>> >  On 29 Jul 2015, at 18:56, David B Funk wrote:
>> > 
>> > >   IE the DNS system is always case-insensitive
>> 
>> >  The difference between DNS being specified as case-insensitive
>>
>>  ...which restores my question about collisions based on case-insensitive
>>  comparison of base64 strings in DNS lookups
>
> i don't get that because md5(strtolower(<email>)) is not base64 and typically 
> a md5-hash has only [a-z][0-9] with no uppercase chars

Ah, right. I'm habituated to thinking in terms of base64-encoded MD5 
rather than hex-encoded MD5.

-- 
  John Hardin KA7OHZ                    http://www.impsec.org/~jhardin/
  jhardin@impsec.org    FALaholic #11174     pgpk -a jhardin@impsec.org
  key: 0xB8732E79 -- 2D8C 34F4 6411 F507 136C  AF76 D822 E6E6 B873 2E79
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