diff --git a/ndn-cpp/security/certificate/public-key.cpp b/ndn-cpp/security/certificate/public-key.cpp
index cd88f7e..183b6f2 100644
--- a/ndn-cpp/security/certificate/public-key.cpp
+++ b/ndn-cpp/security/certificate/public-key.cpp
@@ -20,7 +20,7 @@
 PublicKey::toDER()
 {
   boost::iostreams::stream
-    <boost::iostreams::array_source> is (m_key.buf (), m_key.size ());
+    <boost::iostreams::array_source> is (m_key.buf (), key_.size ());
 
   return der::DerNode::parse(reinterpret_cast<InputIterator &> (is));
 }
diff --git a/ndn-cpp/security/key-chain.cpp b/ndn-cpp/security/key-chain.cpp
index 3f47e3e..197fdfd 100644
--- a/ndn-cpp/security/key-chain.cpp
+++ b/ndn-cpp/security/key-chain.cpp
@@ -137,7 +137,7 @@
 
 #if 0
   if (m_policyManager->requireVerify(*dataPtr))
-    stepVerify(dataPtr, true, m_maxStep, onVerified, onVerifyFailed);
+    stepVerify(dataPtr, true, maxStep_, onVerified, onVerifyFailed);
   else if(m_policyManager->skipVerify(*dataPtr))
 #else
   if (verifySignature(*data))