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<h3>
Eric S. Raymond pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/921291337c50f2b1694ac06a99bfae0d08612b9c">92129133</a></strong>
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<span>by Ian Bruene</span>
<i>at 2019-01-12T17:54:01Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Added description of key generation for usage.
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<h4>1 changed file:</h4>
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<a href="#609c2c0b1eb27fef7a1a180c7fd078d2c4033c62">
devel/nts.adoc
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<h4>Changes:</h4>
<li id="609c2c0b1eb27fef7a1a180c7fd078d2c4033c62">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/921291337c50f2b1694ac06a99bfae0d08612b9c#609c2c0b1eb27fef7a1a180c7fd078d2c4033c62"><strong>devel/nts.adoc</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -47,3 +47,31 @@ don't have the right word handy. It's whatever key transfer or status</td>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">messages are required.</span>
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<pre style="margin: 0;"> <span id="LC48" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">NTP-C to NTP-S (Alpha to Charlie) is in the draft.</span>
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<pre style="margin: 0;">+<span id="LC51" class="line" lang="plaintext">== Key Generation and Usage ==</span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="plaintext">NTS makes use of three keys:</span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="plaintext">* Client to Server (c2s)</span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="plaintext">* Server to Client (s2c)</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">* NTS Master Key</span>
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<pre style="margin: 0;">+<span id="LC61" class="line" lang="plaintext">Because one of the goals of NTS is to not require any per-client state in</span>
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<pre style="margin: 0;">+<span id="LC62" class="line" lang="plaintext">the servers, the server (both NTPD and NTS-KE) does not posess either of the</span>
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<pre style="margin: 0;">+<span id="LC63" class="line" lang="plaintext">c2s/s2c pair. The servers do posess the NTS Master Key, which is expected to</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext">be updated somewhat regularly.</span>
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext">The c2s/s2c pair is created during the TLS handshake between client and NTS-KE.</span>
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="plaintext">As part of this NTS-KE will create a variable number of cookies (should be 8).</span>
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="plaintext">These cookies are encrypted with the NTS master key, and are opaque to the</span>
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="plaintext">client. The cookies contain the c2s/s2c pair in a form that NTPD will</span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="plaintext">understand, and is how NTPD is able to en/decrypt data without needing to</span>
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="plaintext">store per-client keys.</span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="plaintext">When sending an NTS packet the client attaches a cookie-blob in cleartext,</span>
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="plaintext">then encrypts the rest of the data using the c2s key. When the NTPD server</span>
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<pre style="margin: 0;">+<span id="LC75" class="line" lang="plaintext">recieves the packet it decrypts the cookie-blob using its Master Key, and</span>
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<pre style="margin: 0;">+<span id="LC76" class="line" lang="plaintext">extracts the c2s/s2c pair so it can decrypt the rest. The response packet</span>
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<pre style="margin: 0;">+<span id="LC77" class="line" lang="plaintext">is encrypted using the s2c key extracted from the cookie.</span></pre>
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