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<h3>
James Browning 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>
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/e75ee04e5cedc4511f9cbeb47af53019c3936cbf">e75ee04e</a></strong>
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<span>by Paul Theodoropoulos</span>
<i>at 2018-10-02T18:16:04Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;"> Grammar, some formatting for clarity
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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/4310c0bbe5588e381e23b44f4172acd9e98284cf">4310c0bb</a></strong>
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<span>by Paul Theodoropoulos</span>
<i>at 2018-10-02T18:43:25Z</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">WIP significant rewording and reworking of examples
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<h4>1 changed file:</h4>
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<a href="#6f482a425aacfe1c62175e0fc975b00ff38eb4f8">
docs/authentic.txt
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<h4>Changes:</h4>
<li id="6f482a425aacfe1c62175e0fc975b00ff38eb4f8">
<a href="https://gitlab.com/NTPsec/ntpsec/compare/03adfbe2dea9161b4f4b019a62d90b83f967c695...4310c0bbe5588e381e23b44f4172acd9e98284cf#6f482a425aacfe1c62175e0fc975b00ff38eb4f8"><strong>docs/authentic.txt</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">@@ -30,8 +30,8 @@ include::includes/authopt.txt[]</td>
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<pre style="margin: 0;"> <span id="LC30" class="line" lang="plaintext">== Introduction ==</span>
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<pre style="margin: 0;"> <span id="LC31" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC32" class="line" lang="plaintext">Authentication support allows the NTP client to verify that the server</span>
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<pre style="margin: 0;">-<span id="LC33" class="line" lang="plaintext">is in fact known and trusted and not an intruder <span class="idiff left right">intending</span></span>
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<pre style="margin: 0;">-<span id="LC34" class="line" lang="plaintext"><span class="idiff left right">accidentally or on purpose to masquerade</span> as that server. NTP performs</span>
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<pre style="margin: 0;">+<span id="LC33" class="line" lang="plaintext">is in fact known and trusted and not an intruder <span class="idiff left right">accidentally</span></span>
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<pre style="margin: 0;">+<span id="LC34" class="line" lang="plaintext"><span class="idiff left right">or intentionally masquerading</span> as that server. NTP performs</span>
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<pre style="margin: 0;"> <span id="LC35" class="line" lang="plaintext">authentication via message digests. It computes a one-way hash, which</span>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="plaintext">verifies that the server has the correct private key and key identifier.</span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="plaintext"></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">@@ -45,7 +45,7 @@ options described below specify the locations of the key files and</td>
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<pre style="margin: 0;"> <span id="LC45" class="line" lang="plaintext">which symmetric keys are trusted.</span>
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<pre style="margin: 0;"> <span id="LC46" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC47" class="line" lang="plaintext">Authentication is always enabled, although ineffective if not configured</span>
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<pre style="margin: 0;">-<span id="LC48" class="line" lang="plaintext">as described below. If a NTP packet arrives including a message</span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="plaintext">as described below. If a<span class="idiff left right">n</span> NTP packet arrives including a message</span>
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<pre style="margin: 0;"> <span id="LC49" class="line" lang="plaintext">authentication code (MAC), it is accepted only if it passes all</span>
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<pre style="margin: 0;"> <span id="LC50" class="line" lang="plaintext">cryptographic checks. The checks require correct key ID, key value and</span>
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<pre style="margin: 0;"> <span id="LC51" class="line" lang="plaintext">message digest. If the packet has been modified in any way</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">@@ -55,9 +55,9 @@ discarded. Authentication doesn't prevent replays.</td>
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<pre style="margin: 0;"> <span id="LC55" class="line" lang="plaintext">[[symm]]</span>
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<pre style="margin: 0;"> <span id="LC56" class="line" lang="plaintext">=== Symmetric-Key Cryptography ===</span>
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<pre style="margin: 0;"> <span id="LC57" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC58" class="line" lang="plaintext">NTP allows any one of possibly 65,535 keys, each distinguished by a</span>
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<pre style="margin: 0;">-<span id="LC59" class="line" lang="plaintext">32-bit key identifier, to authenticate an association. <span class="idiff left right">The servers</span> and</span>
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<pre style="margin: 0;">-<span id="LC60" class="line" lang="plaintext">client<span class="idiff left right">s involved must agree on the key and key identifi</span>er to</span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="plaintext">NTP allows <span class="idiff left right">use of </span>any one of possibly 65,535 keys, each distinguished by a</span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="plaintext">32-bit key identifier, to authenticate an association. <span class="idiff left right">Both server</span> and</span>
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<pre style="margin: 0;">+<span id="LC60" class="line" lang="plaintext">client<span class="idiff left right"> must agree on the key and key identifier in ord</span>er to</span>
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<pre style="margin: 0;"> <span id="LC61" class="line" lang="plaintext">authenticate NTP packets. Keys and related information are specified</span>
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<pre style="margin: 0;"> <span id="LC62" class="line" lang="plaintext">in a key file. More info in {ntpkeysman}. It must be distributed</span>
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<pre style="margin: 0;"> <span id="LC63" class="line" lang="plaintext">and stored using secure means beyond the scope of the NTP protocol</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">@@ -81,31 +81,34 @@ A server receiving an unauthenticated packet will respond with an</td>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext">unauthenticated packet, while the same server receiving a packet of a</span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext">cryptotype it supports will respond with packets of that cryptotype.</span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC84" class="line" lang="plaintext">Some examples may help to reduce confusion. Client Alice has no</span>
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<pre style="margin: 0;">-<span id="LC85" class="line" lang="plaintext">keys file. Server Bob has a symmetric key file.</span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="plaintext">Alice's unauthenticated messages arrive at Bob,</span>
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="plaintext">who replies with unauthenticated messages. Cathy has a copy of Bob's</span>
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<pre style="margin: 0;">-<span id="LC88" class="line" lang="plaintext">symmetric key file and has selected key ID 4 in messages to Bob. Bob</span>
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<pre style="margin: 0;">-<span id="LC89" class="line" lang="plaintext">verifies the message with his key ID 4. If it's the same key and the</span>
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="plaintext">message is verified, Bob sends Cathy a reply authenticated with that</span>
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<pre style="margin: 0;">-<span id="LC91" class="line" lang="plaintext">key. If verification fails, Bob sends Cathy a crypto-NAK,</span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="plaintext">which tells her something broke. She can see the evidence using the</span>
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="plaintext">{ntpqman} program.</span>
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="plaintext">It should be clear from the above that Bob can support all the girls at</span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="plaintext">the same time, as long as he has compatible authentication and identity</span>
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="plaintext">credentials. Now, Bob can act just like the girls in his own choice of</span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="plaintext">servers; he can run multiple configured associations with multiple</span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="plaintext">different servers (or the same server, although that might not be</span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="plaintext">useful). But, wise security policy might preclude some combinations;</span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="plaintext">for instance, running authentication with one server</span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="plaintext">and no authentication with another might not be wise.</span>
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<pre style="margin: 0;">+<span id="LC84" class="line" lang="plaintext">Some examples may help to reduce confusion.</span>
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<pre style="margin: 0;">+<span id="LC85" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC86" class="line" lang="plaintext">Client Alice has no key file. Server Bob has a symmetric key file.</span>
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<pre style="margin: 0;">+<span id="LC87" class="line" lang="plaintext">Alice sends an unauthenticated message to Bob. Bob therefore replies</span>
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<pre style="margin: 0;">+<span id="LC88" class="line" lang="plaintext">also with an unauthenticated message.</span>
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89
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<pre style="margin: 0;">+<span id="LC89" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC90" class="line" lang="plaintext">Client Carol does have a copy of Bob's symmetric key file. Carol selects</span>
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91
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<pre style="margin: 0;">+<span id="LC91" class="line" lang="plaintext">key ID 4, and sends a message to Bob. Bob verifies the message with his</span>
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<pre style="margin: 0;">+<span id="LC92" class="line" lang="plaintext">key ID 4. If the key matches and the message verifies, Bob replies to</span>
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<pre style="margin: 0;">+<span id="LC93" class="line" lang="plaintext">Carol with a message authenticated with his key ID 4. If verification fails,</span>
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<pre style="margin: 0;">+<span id="LC94" class="line" lang="plaintext">Bob sends Carol a crypto-NAK, which tells her that something is broken.</span>
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<pre style="margin: 0;">+<span id="LC95" class="line" lang="plaintext">She can see the evidence using the {ntpqman} program.</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">It should be clear from the above that Bob can support both unauthenticated</span>
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98
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<pre style="margin: 0;">+<span id="LC98" class="line" lang="plaintext">Alice and authenticated Carol alike. Unauthenticated messages will </span>
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99
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<pre style="margin: 0;">+<span id="LC99" class="line" lang="plaintext">receive unauthenticated replies. Authenticated messages will receive</span>
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100
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<pre style="margin: 0;">+<span id="LC100" class="line" lang="plaintext">authenticated replies, assuming the authentication method and credentials</span>
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101
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<pre style="margin: 0;">+<span id="LC101" class="line" lang="plaintext">are valid and compatible.</span>
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<pre style="margin: 0;">+<span id="LC102" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC103" class="line" lang="plaintext">Bob also can act just like Alice and Carol in his own choice of connections</span>
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<pre style="margin: 0;">+<span id="LC104" class="line" lang="plaintext">to other servers; he can run multiple configured associations with multiple</span>
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<pre style="margin: 0;">+<span id="LC105" class="line" lang="plaintext">different servers (or the same server, although that might not be useful).</span>
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<pre style="margin: 0;"> <span id="LC106" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC107" class="line" lang="plaintext">[[keys]]</span>
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<pre style="margin: 0;"> <span id="LC108" class="line" lang="plaintext">== Key Management ==</span>
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<pre style="margin: 0;"> <span id="LC109" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC110" class="line" lang="plaintext">Shared keys used for authentication are incorporated</span>
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<pre style="margin: 0;">-<span id="LC108" class="line" lang="plaintext">keys files generated by the {ntpkeygenman} utility</span>
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<pre style="margin: 0;">+<span id="LC111" class="line" lang="plaintext"><span class="idiff left right">into the </span>keys files generated by the {ntpkeygenman} utility</span>
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<pre style="margin: 0;"> <span id="LC112" class="line" lang="plaintext">program.</span>
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<pre style="margin: 0;"> <span id="LC113" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC114" class="line" lang="plaintext">[[algorithms]]</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">@@ -115,10 +118,9 @@ The NTP standards include symmetric (private-key) authentication using</td>
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<pre style="margin: 0;"> <span id="LC118" class="line" lang="plaintext">any message digest algorithm supported by the OpenSSL package.</span>
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<pre style="margin: 0;"> <span id="LC119" class="line" lang="plaintext">Digests longer than 20 bytes will be truncated.</span>
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<pre style="margin: 0;"> <span id="LC120" class="line" lang="plaintext">This algorithm computes a message digest or one-way hash</span>
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<pre style="margin: 0;">-<span id="LC118" class="line" lang="plaintext">which can be used to verify the client has the same message digest as</span>
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<pre style="margin: 0;">+<span id="LC121" class="line" lang="plaintext">which can be used to verify th<span class="idiff left right">at th</span>e client has the same message digest as</span>
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<pre style="margin: 0;"> <span id="LC122" class="line" lang="plaintext">the server.</span>
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<pre style="margin: 0;"> <span id="LC123" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC121" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC124" class="line" lang="plaintext">Authentication is configured separately for each association using the</span>
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<pre style="margin: 0;"> <span id="LC125" class="line" lang="plaintext">+key+ option of the +server+ configuration command, as</span>
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<pre style="margin: 0;"> <span id="LC126" class="line" lang="plaintext">described in the link:confopt.html[Server Options] page. The</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">@@ -165,7 +167,6 @@ AES needs a 16 byte key. Longer keys are truncated. Shorter</td>
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<pre style="margin: 0;"> <span id="LC167" class="line" lang="plaintext">keys are padded with 0s. AES MACs are 16 bytes long. MACs longer</span>
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<pre style="margin: 0;"> <span id="LC168" class="line" lang="plaintext">than 20 bytes will be truncated.</span>
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<pre style="margin: 0;"> <span id="LC169" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC168" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="plaintext">Keys and related information are specified in a keys file, which must be</span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="plaintext">distributed and stored using secure means beyond the scope of the NTP</span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="plaintext">protocol itself. Besides the keys used for ordinary NTP associations,</span>
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