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Re: [OAUTH-WG] OAuth Signature

Nat Sakimura <sakimura@gmail.com> Tue, 27 July 2010 22:11 UTC

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Date: Wed, 28 Jul 2010 07:11:26 +0900
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From: Nat Sakimura <sakimura@gmail.com>
To: Dick Hardt <dick.hardt@gmail.com>
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Subject: Re: [OAUTH-WG] OAuth Signature
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On Wed, Jul 28, 2010 at 5:43 AM, Dick Hardt <dick.hardt@gmail.com> wrote:
>
>
> On 2010-07-27, at 12:34 AM, Nat Sakimura wrote:
>
>> I have a fundamental question.
>>
>> While separating signature and payload by a dot "." seems ok,
>> I still have not the answer for the question "why not make everything
>> into JSON and base64url it?".
>
> bloat from base64 encoding twice

Right. Then, what about just removing any newlines from the Magic
Signature JSON representation?

>
>>
>> BTW, some of the envelope parameters such as alg needs to be signed as
>> well to thwart the algorithm replacing attack.
>
> would you elaborate on the attack?
>

It is the atack that was talked about sometime ago around XML Dsig.
Basically, the attacker replaces the algorithm to a good one to a
compromised one
so that he can create a new signature for the tampered data.


-- 
Nat Sakimura (=nat)
http://www.sakimura.org/en/
http://twitter.com/_nat_en

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