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<h3>
Hal Murray 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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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/52ef9b623629f3f337c1044657539ff2406b7921">52ef9b62</a></strong>
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<span>by Hal Murray</span>
<i>at 2019-01-18T10:23:23Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">More updates.
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<h4>1 changed file:</h4>
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devel/nts.adoc
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<h4>Changes:</h4>
<li id="609c2c0b1eb27fef7a1a180c7fd078d2c4033c62">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/52ef9b623629f3f337c1044657539ff2406b7921#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">@@ -18,13 +18,13 @@ The NTS implementation shall:</td>
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<pre style="margin: 0;"> <span id="LC18" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC19" class="line" lang="plaintext">The NTP server maintains no per-client state. The NTP client</span>
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<pre style="margin: 0;"> <span id="LC20" class="line" lang="plaintext">stores the state in a cookie which is sent with each request.</span>
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<pre style="margin: 0;">-<span id="LC21" class="line" lang="plaintext">The cookie is provided by the KE server. The NTP server will</span>
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<pre style="margin: 0;">+<span id="LC21" class="line" lang="plaintext">The cookie is provided by the <span class="idiff left right">NTS-</span>KE server. The NTP server will</span>
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<pre style="margin: 0;"> <span id="LC22" class="line" lang="plaintext">decrypt it to recover the session keys.</span>
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<pre style="margin: 0;"> <span id="LC23" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC24" class="line" lang="plaintext">NTS should <span class="idiff left right">not assist tracking of the client. (Consider</span></span>
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<pre style="margin: 0;">-<span id="LC25" class="line" lang="plaintext"><span class="idiff left right">a laptop that moves from home to work to a coffee shop.)</span></span>
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<pre style="margin: 0;">-<span id="LC26" class="line" lang="plaintext"><span class="idiff left right">Thus cookies should only used once. Each NTP response returns</span></span>
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<pre style="margin: 0;">-<span id="LC27" class="line" lang="plaintext">a new encrypted cookie.</span>
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<pre style="margin: 0;">+<span id="LC24" class="line" lang="plaintext">NTS should <span class="idiff left right">avoid exposing information that would be useful in</span></span>
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<pre style="margin: 0;">+<span id="LC25" class="line" lang="plaintext"><span class="idiff left right">tracking the client. (Consider a laptop that moves from home</span></span>
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<pre style="margin: 0;">+<span id="LC26" class="line" lang="plaintext"><span class="idiff left right">to work to a coffee shop.) Thus cookies should only used once.</span></span>
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<pre style="margin: 0;">+<span id="LC27" class="line" lang="plaintext"><span class="idiff left right">To implement that, each NTP response includes </span>a new encrypted cookie.</span>
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<pre style="margin: 0;"> <span id="LC28" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC29" class="line" lang="plaintext">NTS should not assist DDoS amplification. All NTP responses</span>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">are the same length as the request. This means that some</span>
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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">@@ -61,7 +61,9 @@ deployment.</td>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext">----</span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext">In this diagram, an arrow means "initiates requests to". </span>
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<pre style="margin: 0;">-<span id="LC64" class="line" lang="plaintext">Responses may flow in the other direction.</span>
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<pre style="margin: 0;">+<span id="LC64" class="line" lang="plaintext">Responses flow in the other direction. Each connection</span>
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<pre style="margin: 0;">+<span id="LC65" class="line" lang="plaintext">is used for one request/response transaction.</span>
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66
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<pre style="margin: 0;">+<span id="LC66" class="line" lang="plaintext"></span>
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67
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<pre style="margin: 0;"> <span id="LC67" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC68" class="line" lang="plaintext">=== Alpha -> Bravo ===</span>
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<pre style="margin: 0;"> <span id="LC69" class="line" lang="plaintext">NTP-client to NTS-KE-client (Alpha to Bravo) is pretty simple.</span>
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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">@@ -85,9 +87,24 @@ NTS-client has to make the C2S and S2C keys. They are tangled up</td>
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<pre style="margin: 0;"> <span id="LC87" class="line" lang="plaintext">with TLS.</span>
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<pre style="margin: 0;"> <span id="LC88" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC89" class="line" lang="plaintext">=== Echo -> Charlie & Delta ===</span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext">In this mode, the NTS server generates the cookies, and thus</span>
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="plaintext">must know the master key and the cookie generation recipe.</span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="plaintext"></span>
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88
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<pre style="margin: 0;"> <span id="LC93" class="line" lang="plaintext">Echo to the servers Charlie and Delta is a one shot.</span>
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89
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<pre style="margin: 0;"> <span id="LC94" class="line" lang="plaintext">Echo sends a seed/ratchet mechanism number pair to both servers.</span>
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90
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="plaintext">optionally a rotation time and cookie format number could be sent. </span>
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95
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext">optionally a rotation time and cookie format number could be sent.</span>
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96
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<pre style="margin: 0;">+<span id="LC96" class="line" lang="plaintext"></span>
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97
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<pre style="margin: 0;">+<span id="LC97" class="line" lang="plaintext">=== Or... dump the Echo box</span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext">In this mode, the NTS-server doesn't know the master key</span>
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext">or the cookie format.</span>
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext"></span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="plaintext">NTS-server to NTP-server</span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="plaintext"> NTS-Server sends:</span>
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103
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="plaintext"> C2S and S2C encryption keys 4.2, 5.1</span>
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104
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="plaintext"> A sorted list of AEAD algorithms 4.1.5</span>
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105
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="plaintext"> It gets back:</span>
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106
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<pre style="margin: 0;">+<span id="LC106" class="line" lang="plaintext"> The selected AEAD algorithm 4.1.5</span>
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107
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<pre style="margin: 0;">+<span id="LC107" class="line" lang="plaintext"> 1 to 8 cookies 4.1.6</span>
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91
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108
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="plaintext"></span>
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109
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="plaintext">=== Alpha -> Charlie ===</span>
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110
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="plaintext">NTP-client to NTP-server (Alpha to Charlie)</span>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="119" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -102,6 +119,8 @@ If all goes well (no lost packets) the client sends:</td>
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119
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext">It gets back the same, with the cookie replaced with a new cookie</span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext">and S2C used for authentication.</span>
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<pre style="margin: 0;"> <span id="LC121" class="line" lang="plaintext">New cookies are encrypted with S2C. Pg 20</span>
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<pre style="margin: 0;">+<span id="LC122" class="line" lang="plaintext">The response is the same lengh. The cookie is moved from</span>
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<pre style="margin: 0;">+<span id="LC123" class="line" lang="plaintext">unencrypted to encrypted.</span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext"></span>
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106
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext">All the extra data is in real NTP extensions. (No more of</span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext">the magic length kludgery for the current shared key authentication.)</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="111" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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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">@@ -111,7 +130,8 @@ a cookie-placeholder for each extra cookie it wants. 5.5</td>
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<pre style="margin: 0;"> <span id="LC130" class="line" lang="plaintext">Those slots will be returned with new cookies.</span>
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<pre style="margin: 0;"> <span id="LC131" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC132" class="line" lang="plaintext">The AEAD algorithm is setup to encrypt some data as well as authenticate.</span>
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<pre style="margin: 0;">-<span id="LC114" class="line" lang="plaintext">I don't know of any reason to use that. (Hal, Jan 14)</span>
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<pre style="margin: 0;">+<span id="LC133" class="line" lang="plaintext">For the request, that's empty. For the response, it contains a new</span>
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<pre style="margin: 0;">+<span id="LC134" class="line" lang="plaintext">cookie. (Or cookies.)</span>
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<pre style="margin: 0;"> <span id="LC135" class="line" lang="plaintext">I think we need a nonce in there.</span>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="plaintext">== Key Generation and Usage ==</span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="152" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="172" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -152,3 +172,14 @@ mask in ntpq/peers) and running out of responses is a good time to do</td>
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172
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="plaintext">special things like get a new pool server or get new cookies by running</span>
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153
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173
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="plaintext">NTS-KE again.</span>
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154
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174
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="plaintext"></span>
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175
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<pre style="margin: 0;">+<span id="LC175" class="line" lang="plaintext">---</span>
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176
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="plaintext"></span>
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177
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="plaintext">We need an exponential backoff when the NTS-KE step fails.</span>
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178
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="plaintext"></span>
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179
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="plaintext">---</span>
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180
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="plaintext"></span>
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181
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="plaintext">Note that the communication between NTS-KE client and NTP client</span>
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182
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<pre style="margin: 0;">+<span id="LC182" class="line" lang="plaintext">needs to be kept private. (aka encrypted if it goes over the net)</span>
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183
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="plaintext">Same for NTS-KE server and NTP server.</span>
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184
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="plaintext">Both connections contain C2S and S2C keys.</span>
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185
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="plaintext"></span></pre>
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