diff --git a/search-services/alfresco-search/src/main/java/org/alfresco/solr/AlfrescoCoreAdminHandler.java b/search-services/alfresco-search/src/main/java/org/alfresco/solr/AlfrescoCoreAdminHandler.java
index 83eeeeeaa..cdd8211ba 100644
--- a/search-services/alfresco-search/src/main/java/org/alfresco/solr/AlfrescoCoreAdminHandler.java
+++ b/search-services/alfresco-search/src/main/java/org/alfresco/solr/AlfrescoCoreAdminHandler.java
@@ -32,6 +32,8 @@ import org.alfresco.service.cmr.repository.StoreRef;
 import org.alfresco.solr.adapters.IOpenBitSet;
 import org.alfresco.solr.client.SOLRAPIClientFactory;
 import org.alfresco.solr.config.ConfigUtil;
+import org.alfresco.solr.io.interceptor.SharedSecretRequestInterceptor;
+import org.alfresco.solr.security.SecretSharedPropertyCollector;
 import org.alfresco.solr.tracker.AclTracker;
 import org.alfresco.solr.tracker.ActivatableTracker;
 import org.alfresco.solr.tracker.ShardStatePublisher;
@@ -46,6 +48,7 @@ import org.alfresco.solr.utils.Utils;
 import org.alfresco.util.Pair;
 import org.alfresco.util.shard.ExplicitShardingPolicy;
 import org.apache.commons.io.FileUtils;
+import org.apache.http.HttpRequestInterceptor;
 import org.apache.solr.common.SolrException;
 import org.apache.solr.common.params.CoreAdminParams;
 import org.apache.solr.common.params.SolrParams;
@@ -103,6 +106,7 @@ import static org.alfresco.solr.HandlerReportHelper.buildAclTxReport;
 import static org.alfresco.solr.HandlerReportHelper.buildNodeReport;
 import static org.alfresco.solr.HandlerReportHelper.buildTrackerReport;
 import static org.alfresco.solr.HandlerReportHelper.buildTxReport;
+import static org.alfresco.solr.InterceptorRegistry.registerSolrClientInterceptors;
 import static org.alfresco.solr.utils.Utils.isNotNullAndNotEmpty;
 import static org.alfresco.solr.utils.Utils.isNullOrEmpty;
 import static org.alfresco.solr.utils.Utils.notNullOrEmpty;
@@ -219,6 +223,9 @@ public class AlfrescoCoreAdminHandler extends CoreAdminHandler
         String createDefaultCores = ConfigUtil.locateProperty(ALFRESCO_DEFAULTS, "");
         int numShards = Integer.parseInt(ConfigUtil.locateProperty(NUM_SHARDS, "1"));
         String shardIds = ConfigUtil.locateProperty(SHARD_IDS, null);
+        registerSolrClientInterceptors();
+
+
         if (createDefaultCores != null && !createDefaultCores.isEmpty())
         {
             Thread thread = new Thread(() ->
@@ -230,6 +237,7 @@ public class AlfrescoCoreAdminHandler extends CoreAdminHandler
         }
     }
 
+
     /**
      * Creates new default cores based on the "createDefaultCores" String passed in.
      *
@@ -2230,4 +2238,4 @@ public class AlfrescoCoreAdminHandler extends CoreAdminHandler
 
         return response;
     }
-}
\ No newline at end of file
+}
diff --git a/search-services/alfresco-search/src/main/java/org/alfresco/solr/InterceptorRegistry.java b/search-services/alfresco-search/src/main/java/org/alfresco/solr/InterceptorRegistry.java
new file mode 100644
index 000000000..7b95fe535
--- /dev/null
+++ b/search-services/alfresco-search/src/main/java/org/alfresco/solr/InterceptorRegistry.java
@@ -0,0 +1,57 @@
+/*
+ * #%L
+ * Alfresco Search Services
+ * %%
+ * Copyright (C) 2005 - 2022 Alfresco Software Limited
+ * %%
+ * This file is part of the Alfresco software.
+ * If the software was purchased under a paid Alfresco license, the terms of
+ * the paid license agreement will prevail.  Otherwise, the software is
+ * provided under the following open source license terms:
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ * #L%
+ */
+
+package org.alfresco.solr;
+
+import org.alfresco.solr.io.interceptor.SharedSecretRequestInterceptor;
+import org.alfresco.solr.security.SecretSharedPropertyCollector;
+import org.apache.http.HttpRequestInterceptor;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class InterceptorRegistry
+{
+        protected static final Logger LOGGER = LoggerFactory.getLogger(InterceptorRegistry.class);
+        /**
+         * Register the required {@link HttpRequestInterceptor}s
+         */
+        public static void registerSolrClientInterceptors()
+        {
+                try
+                {
+                        if (SecretSharedPropertyCollector.isCommsSecretShared())
+                        {
+                                SharedSecretRequestInterceptor.register();
+                        }
+                }
+                catch (Throwable t)
+                {
+                        LOGGER.warn("It was not possible to add the Shared Secret Authentication interceptor. "
+                                + "Please make sure to pass the required -Dalfresco.secureComms=secret and "
+                                + "-Dalfresco.secureComms.secret=my-secret-value JVM args if trying to use Secret Authentication with Solr.");
+                }
+        }
+}
diff --git a/search-services/alfresco-search/src/main/java/org/alfresco/solr/io/interceptor/SharedSecretRequestInterceptor.java b/search-services/alfresco-search/src/main/java/org/alfresco/solr/io/interceptor/SharedSecretRequestInterceptor.java
new file mode 100644
index 000000000..08efab006
--- /dev/null
+++ b/search-services/alfresco-search/src/main/java/org/alfresco/solr/io/interceptor/SharedSecretRequestInterceptor.java
@@ -0,0 +1,98 @@
+/*
+ * #%L
+ * Alfresco Search Services
+ * %%
+ * Copyright (C) 2005 - 2022 Alfresco Software Limited
+ * %%
+ * This file is part of the Alfresco software.
+ * If the software was purchased under a paid Alfresco license, the terms of
+ * the paid license agreement will prevail.  Otherwise, the software is
+ * provided under the following open source license terms:
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ * #L%
+ */
+
+package org.alfresco.solr.io.interceptor;
+
+import java.io.IOException;
+
+import org.alfresco.solr.security.SecretSharedPropertyCollector;
+import org.apache.http.HttpException;
+import org.apache.http.HttpRequest;
+import org.apache.http.HttpRequestInterceptor;
+import org.apache.http.message.BasicHeader;
+import org.apache.http.protocol.HttpContext;
+import org.apache.solr.client.solrj.impl.HttpClientUtil;
+
+/**
+ * This HttpRequestInterceptor adds the header that is required for Shared Secret Authentication with Solr
+ *
+ * @author Domenico Sibilio
+ */
+public class SharedSecretRequestInterceptor implements HttpRequestInterceptor
+{
+
+    private static volatile SharedSecretRequestInterceptor INSTANCE;
+
+    private SharedSecretRequestInterceptor()
+    {
+    }
+
+    /**
+     * A typical thread-safe singleton implementation
+     * @return The unique instance of this class
+     */
+    public static SharedSecretRequestInterceptor getInstance()
+    {
+        if (INSTANCE == null)
+        {
+            synchronized (SharedSecretRequestInterceptor.class)
+            {
+                if (INSTANCE == null)
+                {
+                    INSTANCE = new SharedSecretRequestInterceptor();
+                }
+            }
+        }
+
+        return INSTANCE;
+    }
+
+    /**
+     * Decorates the enclosing request with the Shared Secret Authentication header
+     * @param httpRequest
+     * @param httpContext
+     * @throws HttpException
+     * @throws IOException
+     */
+    @Override
+    public void process(HttpRequest httpRequest, HttpContext httpContext)
+        throws HttpException, IOException
+    {
+        String secretName = SecretSharedPropertyCollector.getSecretHeader();
+        String secretValue = SecretSharedPropertyCollector.getSecret();
+        httpRequest.addHeader(new BasicHeader(secretName, secretValue));
+    }
+
+    /**
+     * Utility method to register the unique instance of this {@link HttpRequestInterceptor}
+     */
+    public static void register()
+    {
+        HttpClientUtil.removeRequestInterceptor(getInstance());
+        HttpClientUtil.addRequestInterceptor(getInstance());
+    }
+
+}
\ No newline at end of file
diff --git a/search-services/alfresco-search/src/test/java/org/alfresco/solr/io/interceptor/SharedSecretRequestInterceptorTest.java b/search-services/alfresco-search/src/test/java/org/alfresco/solr/io/interceptor/SharedSecretRequestInterceptorTest.java
new file mode 100644
index 000000000..56bbf7c8b
--- /dev/null
+++ b/search-services/alfresco-search/src/test/java/org/alfresco/solr/io/interceptor/SharedSecretRequestInterceptorTest.java
@@ -0,0 +1,136 @@
+/*
+ * #%L
+ * Alfresco Search Services
+ * %%
+ * Copyright (C) 2005 - 2022 Alfresco Software Limited
+ * %%
+ * This file is part of the Alfresco software.
+ * If the software was purchased under a paid Alfresco license, the terms of
+ * the paid license agreement will prevail.  Otherwise, the software is
+ * provided under the following open source license terms:
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ * #L%
+ */
+
+package org.alfresco.solr.io.interceptor;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertSame;
+
+import java.util.stream.IntStream;
+
+import org.alfresco.httpclient.HttpClientFactory;
+import org.apache.http.Header;
+import org.apache.http.HttpRequestInterceptor;
+import org.apache.http.impl.client.SystemDefaultHttpClient;
+import org.apache.http.message.BasicHttpRequest;
+import org.apache.solr.client.solrj.impl.HttpClientUtil;
+import org.junit.Before;
+import org.junit.Test;
+
+/**
+ * Unit tests for {@link SharedSecretRequestInterceptor}.
+ */
+public class SharedSecretRequestInterceptorTest
+{
+
+    private static final String SECRET_HEADER_PROPERTY = "alfresco.secureComms.secret.header";
+    private static final String SECRET_HEADER_VALUE = "X-My-Secret-Header";
+    private static final String SECRET_PROPERTY = "alfresco.secureComms.secret";
+    private static final String SECRET_VALUE = "my-secret";
+
+    @Before
+    public void setUp()
+    {
+        System.clearProperty(SECRET_HEADER_PROPERTY);
+        System.clearProperty(SECRET_PROPERTY);
+    }
+
+    @Test
+    public void theInterceptor_shouldBeSingleton()
+    {
+        SharedSecretRequestInterceptor interceptor1 = SharedSecretRequestInterceptor.getInstance();
+        SharedSecretRequestInterceptor interceptor2 = SharedSecretRequestInterceptor.getInstance();
+
+        assertSame("There should only be one instance of the interceptor.", interceptor1, interceptor2);
+    }
+
+    @Test
+    public void registeringTheInterceptor_shouldAddOneInterceptor()
+    {
+        SharedSecretRequestInterceptor.register();
+
+        SystemDefaultHttpClient client = (SystemDefaultHttpClient) HttpClientUtil.createClient(null);
+        long sharedSecretInterceptorsCount = getSharedSecretInterceptorsCount(client);
+
+        assertEquals("There should be one Shared Secret request interceptor.", 1, sharedSecretInterceptorsCount);
+    }
+
+    @Test
+    public void registeringTheInterceptorMultipleTimes_shouldAddOnlyOneInterceptor()
+    {
+        IntStream.range(0, 5).forEach(i -> SharedSecretRequestInterceptor.register());
+
+        SystemDefaultHttpClient client = (SystemDefaultHttpClient) HttpClientUtil.createClient(null);
+        long sharedSecretInterceptorsCount = getSharedSecretInterceptorsCount(client);
+
+        assertEquals("There should be only one Shared Secret request interceptor.", 1, sharedSecretInterceptorsCount);
+    }
+
+    @Test
+    public void requestProcessing_shouldAddDefaultSecretHeaderToOutgoingRequests() throws Exception
+    {
+        System.setProperty(SECRET_PROPERTY, SECRET_VALUE);
+        BasicHttpRequest httpRequest = new BasicHttpRequest("", "");
+
+        SharedSecretRequestInterceptor.getInstance().process(httpRequest, null);
+        Header[] headers = httpRequest.getHeaders(HttpClientFactory.DEFAULT_SHAREDSECRET_HEADER);
+
+        assertEquals("There should be only one secret header.", 1, headers.length);
+        assertEquals("The secret header should have the expected value.", SECRET_VALUE, headers[0].getValue());
+    }
+
+    @Test
+    public void requestProcessing_shouldAddCustomSecretHeaderToOutgoingRequests() throws Exception
+    {
+        System.setProperty(SECRET_HEADER_PROPERTY, SECRET_HEADER_VALUE);
+        System.setProperty(SECRET_PROPERTY, SECRET_VALUE);
+        BasicHttpRequest httpRequest = new BasicHttpRequest("", "");
+
+        SharedSecretRequestInterceptor.getInstance().process(httpRequest, null);
+        Header[] headers = httpRequest.getHeaders(SECRET_HEADER_VALUE);
+
+        assertEquals("There should be only one secret header.", 1, headers.length);
+        assertEquals("The secret header should have the expected value.", SECRET_VALUE, headers[0].getValue());
+    }
+
+    @Test(expected = RuntimeException.class)
+    public void requestProcessing_shouldFailWhenMissingSecretValue() throws Exception
+    {
+        BasicHttpRequest httpRequest = new BasicHttpRequest("", "");
+
+        SharedSecretRequestInterceptor.getInstance().process(httpRequest, null);
+    }
+
+    private static long getSharedSecretInterceptorsCount(SystemDefaultHttpClient client)
+    {
+        return IntStream.range(0, client.getRequestInterceptorCount())
+            .mapToObj(client::getRequestInterceptor)
+            .map(HttpRequestInterceptor::getClass)
+            .filter(clazz -> clazz == SharedSecretRequestInterceptor.class)
+            .count();
+    }
+
+}
\ No newline at end of file