security: Fix a bug in generating new key id.

Change-Id: Ibfae7249bea1e2cfefc66cf35e0d75b50867e4b3
diff --git a/src/security/sec-public-info.hpp b/src/security/sec-public-info.hpp
index 37afd5d..aa35ff9 100644
--- a/src/security/sec-public-info.hpp
+++ b/src/security/sec-public-info.hpp
@@ -331,8 +331,8 @@
   else
     oss << "dsk-";
 
-  oss << static_cast<int>(getNow());  
-
+  oss << getNow();
+  
   Name keyName = Name(identityName).append(oss.str());
 
   if (doesPublicKeyExist(keyName))