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Re: [TLS] Justification

Yoav Nir <ynir@checkpoint.com> Wed, 12 May 2010 19:26 UTC

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From: Yoav Nir <ynir@checkpoint.com>
To: Michael D'Errico <mike-list@pobox.com>, TLS Mailing List <tls@ietf.org>
Date: Wed, 12 May 2010 22:13:34 +0300
Thread-Topic: [TLS] Justification
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References: <20100510221531.GC9429@oracle.com> <201005111339.o4BDdoYQ009725@fs4113.wdf.sap.corp> <20100511152153.GF9429@oracle.com> <201005111803.o4BI3fhO006065@stingray.missi.ncsc.mil> <20100511190958.GR9429@oracle.com> <4BE9B0BC.2000101@extendedsubset.com> <20100511194620.GU9429@oracle.com> <4BE9B856.40000@extendedsubset.com> <20100511200728.GW9429@oracle.com> <4BE9CC88.6040103@extendedsubset.com> <87aas5sbzy.fsf@mocca.josefsson.org> <4BEAC145.60607@pobox.com> <1273676748.1486.4.camel@sockerbit> <4BEADE7A.2070002@extendedsubset.com>, <4BEAEAAF.6090402@pobox.com>
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Subject: Re: [TLS] Justification
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802.15.4 networks operate at 10-40 kbps. A kilobyte takes just under a second at low power, or a quarter second at full power.

________________________________________
From: tls-bounces@ietf.org [tls-bounces@ietf.org] On Behalf Of Michael D'Errico [mike-list@pobox.com]
Sent: Wednesday, May 12, 2010 20:51
To: TLS Mailing List
Subject: Re: [TLS] Justification

Marsh Ray wrote:
> On 5/12/2010 10:05 AM, Simon Josefsson wrote:
>> ons 2010-05-12 klockan 07:55 -0700 skrev Michael D'Errico:
>>> Can someone please remind me why we want cached-info?
>
> It saves KB++ at the beginning of handshakes, which is a really big deal
> for some deployments.

Can you point to some real examples?

3G networks operate at 144kbps, so each KB takes 56 ms to download.
That might be sorta slow, but the rollout of 4G is already taking place
and the speeds will be crazy fast at 100Mbps.

If you're concerned about memory use, consider that the 1st generation
iPod touch had 128 MB of RAM; 3rd gen has 256.  Even old Blackberries
had 64 MB of RAM.

What constrained environments exist today that will still be constrained
once they are upgraded to support this cached-info extension?

Mike

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