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Re: [TLS] draft-ietf-tls-esni feedback

"Salz, Rich" <rsalz@akamai.com> Wed, 23 October 2019 02:29 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Rob Sayre <sayrer@gmail.com>, Stephen Farrell <stephen.farrell@cs.tcd.ie>
CC: "TLS@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] draft-ietf-tls-esni feedback
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Date: Wed, 23 Oct 2019 02:29:14 +0000
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References: <CAChr6Sw3f7du3JYxfcWSZje1zjDzsRBQyDjob-AvzjWeZzKW7g@mail.gmail.com> <CABcZeBOnE+gyNu7GarAfO0bptoPfzQQ=VKeWLdpJBDM=E4yhzg@mail.gmail.com> <CAChr6SxWE66jPRbnBRtwNSn3L+uNFkoFBbYNOBAkKDN05qotoA@mail.gmail.com> <CABcZeBOy8ogJrmFajxX1pqjqgnE61gE=c3CWz+pp34NWHmGKbw@mail.gmail.com> <03e15760-dfce-cd7b-baea-56ac70d92192@cs.tcd.ie> <CAChr6SzmpSn3Q8tBi+Pdc+Bq7stiukbufbh-jDt+AEtrkV8XGg@mail.gmail.com> <f87c2916-d03d-2715-7b36-7b70fead8df4@cs.tcd.ie> <CAChr6SxfT0ed5J89siGX23A0G77BJQWxFRDoJ1w0v7=5O0KERw@mail.gmail.com> <8063bb12-8462-53fa-fa62-1e5abb1a652e@cs.tcd.ie> <CAHbrMsBPJqzaUSa42gGq45MfsTvCVW7t95q3feWEiSYeSN9ocw@mail.gmail.com> <333fde42-76f9-1af3-0f0f-c70914b0222e@cs.tcd.ie> <CAHbrMsA0PFwvu3hvZgXMbe2Buzq9dQHgNJJLOqtyMUzb-qpc0A@mail.gmail.com> <04a5a50a-3268-d9fb-de16-abb9224409ed@cs.tcd.ie> <CAChr6SySVXsH1J7KGDJjjB=wdxhdaCe207pLn2fGFMmDb1q82w@mail.gmail.com> <BE5E7283-6EF4-4113-ADBA-7790A5DFACD8@akamai.com> <e20daa2c-b239-11e0-87e7-beaebb80aebf@cs.tcd.ie> <975963dc-f311-b806-6860-8768f4ec1a76@cs.tcd.ie> <CAChr6SyU_ArsKi16Bj47eZWVRMJ8wekFKAzFLENkUB31fSgPKw@mail.gmail.com>
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Subject: Re: [TLS] draft-ietf-tls-esni feedback
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  *   Low numbers might encounter all sorts of well-known cryptographic problems, and varying the padding of the domain name with any granularity would tend to narrow the search space for an attacker.

What well-known cryptographic problems?  Varying the padding can also *add* security because foo.secret.example.com could show up with two different sizes.

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