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Re: [TLS] The future of external PSK in TLS 1.3

Carrick Bartle <cbartle891@icloud.com> Wed, 30 September 2020 01:03 UTC

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From: Carrick Bartle <cbartle891@icloud.com>
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Cc: "Blumenthal, Uri - 0553 - MITLL" <uri@ll.mit.edu>, "tls@ietf.org" <tls@ietf.org>
To: Watson Ladd <watsonbladd@gmail.com>
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Subject: Re: [TLS] The future of external PSK in TLS 1.3
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>  applications that can afford the CPU

a) Not all applications can afford the CPU
b) It's not just about CPU; there are use cases where bandwidth is also an issue.


> On Sep 29, 2020, at 5:29 PM, Watson Ladd <watsonbladd@gmail.com> wrote:
> 
> On Tue, Sep 29, 2020 at 12:49 PM Blumenthal, Uri - 0553 - MITLL
> <uri@ll.mit.edu <mailto:uri@ll.mit.edu>> wrote:
>> 
>> I share Achim's concerns.
>> 
>> But I believe the explanations will turn out mostly useless in the real world, as the "lawyers" of the industry are guaranteed to steer away from something "not recommended".
>> 
>> In one word: bad.
> 
> Why is PSK so necessary? There are very few devices that can't handle
> the occasional ECC operation.  The key management and forward secrecy
> issues with TLS-PSK are real. Steering applications that can afford
> the CPU away from PSK and toward hybrid modes is a good thing and why
> this registry exists imho.
> 
> 
> -- 
> Astra mortemque praestare gradatim
> 
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