diff --git a/src/SoCommunicator.php b/src/SoCommunicator.php
index 4bf5584..1547226 100644
--- a/src/SoCommunicator.php
+++ b/src/SoCommunicator.php
@@ -291,7 +291,7 @@ private function AppendHash($string)
         if (empty($this->ObscuritySeed))
                 throw new \UnexpectedValueException('No security seed set when using security suffix.');
         
-        $hash = crypt($string, $this->ObscuritySeed);
+        $hash = base64_encode(crypt($string, $this->ObscuritySeed));
         return $string . substr($hash, 0, $this->ObscuritySuffixLength);
     }
     
diff --git a/tests/unit/at/externet/eps_bank_transfer/SoCommunicatorTest.php b/tests/unit/at/externet/eps_bank_transfer/SoCommunicatorTest.php
index 680882f..ff5dc86 100644
--- a/tests/unit/at/externet/eps_bank_transfer/SoCommunicatorTest.php
+++ b/tests/unit/at/externet/eps_bank_transfer/SoCommunicatorTest.php
@@ -147,7 +147,7 @@ public function testSendTransferInitiatorDetailsWithSecurityAppendsHash()
         
         $this->target->SendTransferInitiatorDetails($transferInitiatorDetails, $url);
         $this->assertEquals('string', gettype($this->mTransport->lastPostBody));
-        $this->assertContains('>'. 'Order1SoxmdwbL' . '<', $this->mTransport->lastPostBody);
+        $this->assertContains('>'. 'Order1U294bWR3' . '<', $this->mTransport->lastPostBody);
     }
     
     public function testHandleConfirmationUrlThrowsExceptionOnMissingCallback()
@@ -403,7 +403,7 @@ public function testHandleConfirmationUrlStripsSecurityHashFromRemittanceIdentif
     {
         $original = $this->GetEpsData('BankConfirmationDetailsWithoutSignature.xml');
         $expected = 'AT1234567890XYZ';
-        $data = str_replace($expected, $expected . 'Fo7', $original);
+        $data = str_replace($expected, $expected . 'Rm8', $original);
         $dataPath = tempnam(sys_get_temp_dir(), 'SoCommunicatorTest_');
         file_put_contents($dataPath, $data);