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Re: [saag] [Cfrg] Further MD5 breaks: Creating a rogue CAcertificate

"Timothy J. Miller" <tmiller@mitre.org> Mon, 05 January 2009 06:54 UTC

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Date: Wed, 31 Dec 2008 12:30:13 -0600
From: "Timothy J. Miller" <tmiller@mitre.org>
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To: Dr Stephen Henson <lists@drh-consultancy.demon.co.uk>
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Subject: Re: [saag] [Cfrg] Further MD5 breaks: Creating a rogue CAcertificate
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Dr Stephen Henson wrote:
> Mike wrote:
>> I sent my last message a bit too hastily.  Other ideas that I was
>> contemplating should have been mentioned including:
>>
>>   - remove any unrecognized extensions
>>   - remove tumors
>>
>> Those could potentially cause problems if for some reason they were
>> actually needed.  This one, though, shouldn't cause trouble:
>>
>>   - add a private EKU with a random number (or two) in the OID
>>
>> That would not mess up the serial number scheme in use or modify the
>> subject name as has been suggested.
>>
> 
> Or add a non-critical extension with some randomness in it...

Do you want to propose id-ce-magicCookie OBJECT IDENTIFIER  ::=  {id-ce 
55} or should I?  :)

-- Tim


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