diff --git a/apps/files/lib/Command/TransferOwnership.php b/apps/files/lib/Command/TransferOwnership.php
index e91d2ef98175..5fe8743f1ecc 100644
--- a/apps/files/lib/Command/TransferOwnership.php
+++ b/apps/files/lib/Command/TransferOwnership.php
@@ -40,6 +40,8 @@
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\GenericEvent;
 
 class TransferOwnership extends Command {
 
@@ -61,6 +63,9 @@ class TransferOwnership extends Command {
 	/** @var ProviderFactory  */
 	private $shareProviderFactory;
 
+	/** @var EventDispatcherInterface */
+	private $eventDispatcher;
+
 	/** @var bool */
 	private $filesExist = false;
 
@@ -85,13 +90,20 @@ class TransferOwnership extends Command {
 	/** @var string */
 	private $finalTarget;
 
-	public function __construct(IUserManager $userManager, IManager $shareManager, IMountManager $mountManager, Manager $encryptionManager, ILogger $logger, ProviderFactory $shareProviderFactory) {
+	/** @var array , Files affected with signature mismatch */
+	private $affectedFiles = [];
+
+	public function __construct(IUserManager $userManager, IManager $shareManager,
+								IMountManager $mountManager, Manager $encryptionManager,
+								ILogger $logger, ProviderFactory $shareProviderFactory,
+								EventDispatcherInterface $eventDispatcher) {
 		$this->userManager = $userManager;
 		$this->shareManager = $shareManager;
 		$this->mountManager = $mountManager;
 		$this->encryptionManager = $encryptionManager;
 		$this->logger = $logger;
 		$this->shareProviderFactory = $shareProviderFactory;
+		$this->eventDispatcher = $eventDispatcher;
 		parent::__construct();
 	}
 
@@ -287,7 +299,20 @@ protected function transfer(OutputInterface $output) {
 			}
 		}
 
+		$this->eventDispatcher->addListener('files.aftersignaturemismatch', function (GenericEvent $event) {
+			if ($event->hasArgument('signatureMismatch') && $event->hasArgument('fileName')) {
+				$fileName = $event->getArgument('fileName');
+				if (!isset($this->affectedFiles[$fileName])) {
+					$this->affectedFiles[$fileName] = 1;
+				}
+			}
+		}, 10);
+
 		$view->rename($sourcePath, $this->finalTarget);
+		if (\count($this->affectedFiles) >= 1) {
+			$glueString = (\count($this->affectedFiles) > 1) ? ", " : "";
+			$output->writeln("<error>The affected files are : " . \implode($glueString, \array_keys($this->affectedFiles)) . "</error>");
+		}
 
 		if (!\is_dir("$this->sourceUser/files")) {
 			// because the files folder is moved away we need to recreate it
diff --git a/lib/private/Files/Storage/Wrapper/Encryption.php b/lib/private/Files/Storage/Wrapper/Encryption.php
index 2a9bff7e2fbd..a0668853ebc3 100644
--- a/lib/private/Files/Storage/Wrapper/Encryption.php
+++ b/lib/private/Files/Storage/Wrapper/Encryption.php
@@ -42,6 +42,8 @@
 use OCP\Files\Storage;
 use OCP\ILogger;
 use OCP\Files\Cache\ICacheEntry;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\GenericEvent;
 
 class Encryption extends Wrapper {
 	use LocalTempFileTrait;
@@ -85,6 +87,9 @@ class Encryption extends Wrapper {
 	/** @var  ArrayCache */
 	private $arrayCache;
 
+	/** @var EventDispatcherInterface */
+	private $eventDispatcher;
+
 	/** @var array which has information of sourcePath during rename operation */
 	private $sourcePath;
 
@@ -112,7 +117,8 @@ public function __construct(
 			IStorage $keyStorage = null,
 			Update $update = null,
 			Manager $mountManager = null,
-			ArrayCache $arrayCache = null
+			ArrayCache $arrayCache = null,
+			EventDispatcherInterface $eventDispatcher = null
 		) {
 		$this->mountPoint = $parameters['mountPoint'];
 		$this->mount = $parameters['mount'];
@@ -126,6 +132,7 @@ public function __construct(
 		$this->update = $update;
 		$this->mountManager = $mountManager;
 		$this->arrayCache = $arrayCache;
+		$this->eventDispatcher = ($eventDispatcher === null) ? \OC::$server->getEventDispatcher() : $eventDispatcher;
 		parent::__construct($parameters);
 	}
 
@@ -774,6 +781,13 @@ private function copyBetweenStorage(Storage\IStorage $sourceStorage, $sourceInte
 			}
 		} else {
 			try {
+				$signatureMismatch = false;
+				$this->eventDispatcher->addListener('files.aftersignaturemismatch', function (GenericEvent $event) use ($sourceInternalPath, &$signatureMismatch) {
+					if ($event->hasArgument('signatureMismatch') && ($event->getArgument('signatureMismatch') === true)) {
+						$event->setArgument('fileName', $sourceInternalPath);
+						$signatureMismatch = true;
+					}
+				}, 20);
 				$source = $sourceStorage->fopen($sourceInternalPath, 'r');
 				if ($isRename && (\count($mount) === 1)) {
 					$sourceStorageMountPoint = $mount[0]->getMountPoint();
@@ -785,6 +799,9 @@ private function copyBetweenStorage(Storage\IStorage $sourceStorage, $sourceInte
 				list(, $result) = \OC_Helper::streamCopy($source, $target);
 				\fclose($source);
 				\fclose($target);
+				if ($signatureMismatch === true) {
+					$this->logger->warning("The file $sourceInternalPath has signature mismatch");
+				}
 			} catch (\Exception $e) {
 				Encryption::setDisableWriteEncryption(false);
 				\fclose($source);
diff --git a/lib/private/Files/Stream/Encryption.php b/lib/private/Files/Stream/Encryption.php
index f59ba9d641ad..6e66712dfc43 100644
--- a/lib/private/Files/Stream/Encryption.php
+++ b/lib/private/Files/Stream/Encryption.php
@@ -28,6 +28,7 @@
 
 use Icewind\Streams\Wrapper;
 use OC\Encryption\Exceptions\EncryptionHeaderKeyExistsException;
+use Symfony\Component\EventDispatcher\GenericEvent;
 
 class Encryption extends Wrapper {
 
@@ -281,6 +282,7 @@ public function stream_eof() {
 
 	public function stream_read($count) {
 		$result = '';
+		$genericEvent = new GenericEvent('SignatureMismatch', []);
 
 		$count = \min($count, $this->unencryptedSize - $this->position);
 		while ($count > 0) {
@@ -302,6 +304,7 @@ public function stream_read($count) {
 				$count -= ($this->unencryptedBlockSize - $blockPosition);
 			}
 		}
+		\OC::$server->getEventDispatcher()->dispatch('files.aftersignaturemismatch', $genericEvent);
 		return $result;
 	}
 
diff --git a/tests/lib/Files/Storage/Wrapper/EncryptionTest.php b/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
index f2fdca552911..ed55545b58ae 100644
--- a/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
+++ b/tests/lib/Files/Storage/Wrapper/EncryptionTest.php
@@ -7,6 +7,8 @@
 use OC\Files\View;
 use OC\User\Manager;
 use OCP\Files\Storage\IStorage;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
+use Symfony\Component\EventDispatcher\GenericEvent;
 use Test\Files\Storage\Storage;
 use OC\Files\Storage\Wrapper\Encryption;
 use OC\Files\Cache\Cache;
@@ -101,6 +103,9 @@ class EncryptionTest extends Storage {
 	/** @var  \OC\Memcache\ArrayCache | \PHPUnit_Framework_MockObject_MockObject */
 	private $arrayCache;
 
+	/** @var EventDispatcherInterface | \PHPUnit_Framework_MockObject_MockObject */
+	private $eventDisaptcher;
+
 	/** @var  integer dummy unencrypted size */
 	private $dummySize = -1;
 
@@ -178,6 +183,8 @@ protected function setUp() {
 			->disableOriginalConstructor()->getMock();
 		$this->mountManager->expects($this->any())->method('findByStorageId')->willReturn([]);
 
+		$this->eventDisaptcher = $this->createMock(EventDispatcherInterface::class);
+
 		$this->instance = $this->getMockBuilder(Encryption::class)
 			->setConstructorArgs(
 				[
@@ -187,7 +194,9 @@ protected function setUp() {
 						'mountPoint' => '/',
 						'mount' => $this->mount
 					],
-					$this->encryptionManager, $this->util, $this->logger, $this->file, null, $this->keyStore, $this->update, $this->mountManager, $this->arrayCache
+					$this->encryptionManager, $this->util, $this->logger,
+					$this->file, null, $this->keyStore, $this->update,
+					$this->mountManager, $this->arrayCache, $this->eventDisaptcher
 				]
 			)
 			->setMethods(['getMetaData', 'getCache', 'getEncryptionModule'])