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Date: Mon, 20 Oct 2014 09:04:57 -0400
From: "Bendler, Ehren" <ebendler@...na.com>
To: "oss-security@...ts.openwall.com" <oss-security@...ts.openwall.com>
Subject: RE: attacking hsts through ntp

The symmetric schemes do work, but due to data structure sizing only MD5 and SHA-1 hashed PSKs are supported:
http://bugs.ntp.org/show_bug.cgi?id=2039

They imply in the comments that it will take a new version of the NTP RFCs to get support for stronger hashing schemes.


-----Original Message-----
From: Stephen Röttger [mailto:stephen.roettger@...il.com] 
Sent: Monday, October 20, 2014 5:17 AM
To: oss-security@...ts.openwall.com
Subject: Re: [oss-security] attacking hsts through ntp

>What about RFC 5906 and the current authentication schemes
> (http://www.eecis.udel.edu/~mills/ntp/html/authentic.html) ?

The protocol from RFC 5906 is completely broken:
  http://www.eecis.udel.edu/~mills/security.html
  http://zero-entropy.de/autokey_analysis.pdf

The symmetric schemes are probably fine but hard to set up. But it looks like the NIST provides authenticated NTP:
http://www.nist.gov/pml/div688/grp40/auth-ntp.cfm

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