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Re: [TLS] Comments on

Bill Frantz <frantz@pwpconsult.com> Tue, 18 February 2014 05:19 UTC

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Date: Mon, 17 Feb 2014 21:19:15 -0800
From: Bill Frantz <frantz@pwpconsult.com>
To: Watson Ladd <watsonbladd@gmail.com>
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Cc: Adam Langley <agl@imperialviolet.org>, Niels Möller <nisse@lysator.liu.se>, tls@ietf.org
Subject: Re: [TLS] Comments on
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On 2/17/14 at 9:00 PM, watsonbladd@gmail.com (Watson Ladd) wrote:

>I don't think there is any way around that. If I want to ensure all
>read data has property P, and P depends on every byte of input, I need
>to look at all the input bytes before revealing any data.

Well, you can work on sub-blocks of the whole chunk of data. 
Either a MAC or digital signature on each sub-block would do. 
Verify the sub-block and it can be released to the relying 
application. If we are using a 32 byte MAC, then 3200 byte 
blocks would only have 1% overhead for checking. There are very 
few systems where a buffer size the order of 3200 would cause a 
serious problem.

Cheers - Bill

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