diff --git a/src/Socialbox/Classes/StandardMethods/EncryptionChannel/EncryptionChannelAcknowledgeMessage.php b/src/Socialbox/Classes/StandardMethods/EncryptionChannel/EncryptionChannelAcknowledgeMessage.php
new file mode 100644
index 0000000..8deb288
--- /dev/null
+++ b/src/Socialbox/Classes/StandardMethods/EncryptionChannel/EncryptionChannelAcknowledgeMessage.php
@@ -0,0 +1,134 @@
+<?php
+
+    namespace Socialbox\Classes\StandardMethods\EncryptionChannel;
+
+    use Socialbox\Abstracts\Method;
+    use Socialbox\Classes\Validator;
+    use Socialbox\Enums\StandardError;
+    use Socialbox\Enums\Status\EncryptionChannelStatus;
+    use Socialbox\Exceptions\DatabaseOperationException;
+    use Socialbox\Exceptions\Standard\InvalidRpcArgumentException;
+    use Socialbox\Exceptions\Standard\MissingRpcArgumentException;
+    use Socialbox\Exceptions\Standard\StandardRpcException;
+    use Socialbox\Interfaces\SerializableInterface;
+    use Socialbox\Managers\EncryptionChannelManager;
+    use Socialbox\Objects\ClientRequest;
+    use Socialbox\Objects\Database\EncryptionChannelRecord;
+    use Socialbox\Objects\RpcRequest;
+
+    class EncryptionChannelAcknowledge extends Method
+    {
+
+        /**
+         * @inheritDoc
+         */
+        public static function execute(ClientRequest $request, RpcRequest $rpcRequest): ?SerializableInterface
+        {
+            if(!$rpcRequest->containsParameter('channel_uuid'))
+            {
+                throw new MissingRpcArgumentException('channel_uuid');
+            }
+            elseif(!Validator::validateUuid($rpcRequest->getParameter('channel_uuid')))
+            {
+                throw new InvalidRpcArgumentException('channel_uuid', 'The given channel uuid is not a valid UUID V4');
+            }
+
+            try
+            {
+                $channelUuid = $rpcRequest->getParameter('channel_uuid');
+                $encryptionChannel = EncryptionChannelManager::getChannel($channelUuid);
+            }
+            catch(DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to retrieve the encryption channel', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            if($encryptionChannel === null)
+            {
+                return $rpcRequest->produceError(StandardError::NOT_FOUND, 'The encryption channel does not exist');
+            }
+
+            try
+            {
+                $requestingPeer = $request->getPeer();
+            }
+            catch (DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to retrieve the peer', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            if($requestingPeer === null)
+            {
+                return $rpcRequest->produceError(StandardError::UNAUTHORIZED, 'The peer is not authorized');
+            }
+
+            if(!$encryptionChannel->isParticipant($requestingPeer->getAddress()))
+            {
+                return $rpcRequest->produceError(StandardError::UNAUTHORIZED, 'The encryption channel is not accessible');
+            }
+            elseif($encryptionChannel->getStatus() !== EncryptionChannelStatus::OPENED)
+            {
+                return $rpcRequest->produceError(StandardError::FORBIDDEN, 'The encryption channel is not opened');
+            }
+
+            if(!$rpcRequest->containsParameter('message_uuid'))
+            {
+                throw new MissingRpcArgumentException('message_uuid');
+            }
+
+            if(is_array($rpcRequest->getParameter('message_uuid')))
+            {
+                return self::handleMultipleMessages($rpcRequest, $encryptionChannel);
+            }
+            elseif(is_string($rpcRequest->getParameter('message_uuid')))
+            {
+                return self::handleSingleMessage($rpcRequest, $encryptionChannel);
+            }
+
+            return $rpcRequest->produceError(StandardError::BAD_REQUEST, 'The message_uuid parameter must be a string or an array of strings');
+        }
+
+        private static function handleSingleMessage(RpcRequest $rpcRequest, EncryptionChannelRecord $encryptionChannel)
+        {
+            if(!Validator::validateUuid($rpcRequest->getParameter('message_uuid')))
+            {
+                throw new InvalidRpcArgumentException('message_uuid', 'The given message uuid is not a valid UUID V4');
+            }
+
+            try
+            {
+                EncryptionChannelManager::acknowledgeMessage($encryptionChannel->getUuid(), $rpcRequest->getParameter('message_uuid'));
+            }
+            catch(DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to acknowledge the message', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+            return $rpcRequest->produceResponse(true);
+        }
+
+        private static function handleMultipleMessages(RpcRequest $rpcRequest, EncryptionChannelRecord $encryptionChannel)
+        {
+            $messageUuids = $rpcRequest->getParameter('message_uuid');
+
+            foreach($messageUuids as $messageUuid)
+            {
+                if(!Validator::validateUuid($messageUuid))
+                {
+                    return $rpcRequest->produceError(StandardError::BAD_REQUEST, sprintf('The message uuid %s is not a valid UUID V4', $messageUuid));
+                }
+            }
+
+            try
+            {
+                EncryptionChannelManager::acknowledgeMessagesBatch($encryptionChannel->getUuid(), $messageUuids);
+            }
+            catch(DatabaseOperationException $e)
+            {
+                throw new StandardRpcException('Failed to acknowledge the messages', StandardError::INTERNAL_SERVER_ERROR, $e);
+            }
+
+
+            return $rpcRequest->produceResponse(true);
+        }
+    }
\ No newline at end of file