diff --git a/src/helper/command-interest-generator.cpp b/src/helper/command-interest-generator.cpp
new file mode 100644
index 0000000..f08d524
--- /dev/null
+++ b/src/helper/command-interest-generator.cpp
@@ -0,0 +1,56 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * See COPYING for copyright and distribution information.
+ */
+
+#include "command-interest-generator.hpp"
+#include "../util/time.hpp"
+#include "../util/random.hpp"
+
+#include <unistd.h>
+
+namespace ndn
+{
+const Name CommandInterestGenerator::DEFAULT_CERTIFICATE_NAME = Name();
+
+CommandInterestGenerator::CommandInterestGenerator()
+  : m_lastTimestamp(time::now() / 1000000)
+{}
+
+void
+CommandInterestGenerator::generate(Interest& interest, 
+				   const Name& certificateName /*= DEFAULT_CERTIFICATE_NAME*/)
+{
+  int64_t timestamp = time::now();
+  while(timestamp == m_lastTimestamp)
+    {
+      usleep(1000); //Guarantee unqiueness of timestamp
+      timestamp = time::now();
+    }
+  
+  interest.getName().append(name::Component::fromNumber(timestamp)).append(name::Component::fromNumber(random::generateWord64()));
+
+  if(certificateName == DEFAULT_CERTIFICATE_NAME)
+    m_keyChain.sign(interest);
+  else
+    m_keyChain.sign(interest, certificateName);
+
+  m_lastTimestamp = timestamp;
+}
+  
+void
+CommandInterestGenerator::generateWithIdentity(Interest& interest, const Name& identity)
+{
+  int64_t timestamp = time::now() / 1000000;
+  if(timestamp <= m_lastTimestamp)
+    timestamp = m_lastTimestamp + 1;
+  
+  interest.getName().append(name::Component::fromNumber(timestamp)).append(name::Component::fromNumber(random::generateWord64()));
+
+  m_keyChain.signByIdentity(interest, identity);
+
+  m_lastTimestamp = timestamp;
+}
+
+}//ndn
diff --git a/src/helper/command-interest-generator.hpp b/src/helper/command-interest-generator.hpp
new file mode 100644
index 0000000..70208f2
--- /dev/null
+++ b/src/helper/command-interest-generator.hpp
@@ -0,0 +1,40 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * See COPYING for copyright and distribution information.
+ */
+
+#ifndef NDN_COMMAND_INTEREST_GENERATOR_HPP
+#define NDN_COMMAND_INTEREST_GENERATOR_HPP
+
+#include "../interest.hpp"
+#include "../security/key-chain.hpp"
+
+
+namespace ndn
+{
+
+class CommandInterestGenerator
+{
+public:
+  static const Name DEFAULT_CERTIFICATE_NAME;
+
+  CommandInterestGenerator();
+
+  virtual
+  ~CommandInterestGenerator() {}
+
+  void
+  generate(Interest& interest, const Name& certificateName = DEFAULT_CERTIFICATE_NAME);
+  
+  void
+  generateWithIdentity(Interest& interest, const Name& identity);
+  
+private:
+  int64_t m_lastTimestamp;
+  KeyChain m_keyChain;
+};
+
+}//ndn
+
+#endif
diff --git a/src/helper/command-interest-validator.cpp b/src/helper/command-interest-validator.cpp
new file mode 100644
index 0000000..396ee8f
--- /dev/null
+++ b/src/helper/command-interest-validator.cpp
@@ -0,0 +1,87 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * See COPYING for copyright and distribution information.
+ */
+
+#include "command-interest-validator.hpp"
+
+namespace ndn
+{
+const ssize_t CommandInterestValidator::POS_SIG_VALUE  = -1;
+const ssize_t CommandInterestValidator::POS_SIG_INFO   = -2;
+const ssize_t CommandInterestValidator::POS_RANDOM_VAL = -3;
+const ssize_t CommandInterestValidator::POS_TIMESTAMP  = -4;
+const int64_t CommandInterestValidator::GRACE_INTERVAL = 3000;
+
+void
+CommandInterestValidator::checkPolicy (const Interest& interest, 
+					      int stepCount, 
+					      const OnInterestValidated &onValidated, 
+					      const OnInterestValidationFailed &onValidationFailed,
+					      std::vector<shared_ptr<ValidationRequest> > &nextSteps)
+{
+  try{
+    Name interestName  = interest.getName();
+
+    Signature signature(interestName.get(POS_SIG_INFO).blockFromValue(), 
+			interestName.get(POS_SIG_VALUE).blockFromValue());
+    
+    SignatureSha256WithRsa sig(signature);
+    const Name & keyLocatorName = sig.getKeyLocator().getName();
+    Name keyName = IdentityCertificate::certificateNameToPublicKeyName(keyLocatorName);
+
+    //Check if command is in the trusted scope
+    bool inScope = false;
+    std::list<SecRuleSpecific>::iterator scopeIt = m_trustScopeForInterest.begin();
+    for(; scopeIt != m_trustScopeForInterest.end(); scopeIt++)
+      {
+	if(scopeIt->satisfy(interestName, keyName))
+	  {
+	    inScope = true;
+	    break;
+	  }
+      }
+    if(inScope == false)
+      {
+	onValidationFailed(interest.shared_from_this());
+	return;
+      }
+
+    //Check if timestamp is valid
+    uint64_t timestamp = interestName.get(POS_TIMESTAMP).toNumber();
+    uint64_t current = static_cast<uint64_t>(time::now()/1000000);
+    std::map<Name, uint64_t>::const_iterator timestampIt = m_lastTimestamp.find(keyName);
+    if(timestampIt == m_lastTimestamp.end())
+      {
+	if(timestamp > (current + m_graceInterval) || (timestamp + m_graceInterval) < current)
+	  {
+	    onValidationFailed(interest.shared_from_this());
+	    return;
+	  }
+      }
+    else if(m_lastTimestamp[keyName] >= timestamp)
+      {
+	onValidationFailed(interest.shared_from_this());
+	return;
+      }
+    
+    //Check if signature can be verified
+    Name signedName = interestName.getPrefix(-1);
+    Buffer signedBlob = Buffer(signedName.wireEncode().value(), signedName.wireEncode().value_size()); //These two lines could be optimized
+    if(!Validator::verifySignature(signedBlob.buf(), signedBlob.size(), sig, m_trustAnchorsForInterest[keyName]))
+      {
+	onValidationFailed(interest.shared_from_this());
+	return;
+      }
+
+    m_lastTimestamp[keyName] = timestamp;
+    onValidated(interest.shared_from_this());
+    return;
+
+  }catch(...){
+    onValidationFailed(interest.shared_from_this());
+  }
+}
+
+}//ndn
diff --git a/src/helper/command-interest-validator.hpp b/src/helper/command-interest-validator.hpp
new file mode 100644
index 0000000..7021a78
--- /dev/null
+++ b/src/helper/command-interest-validator.hpp
@@ -0,0 +1,79 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/**
+ * Copyright (C) 2013 Regents of the University of California.
+ * See COPYING for copyright and distribution information.
+ */
+
+#ifndef NDN_COMMAND_INTEREST_VALIDATOR_HPP
+#define NDN_COMMAND_INTEREST_VALIDATOR_HPP
+
+#include "../security/validator.hpp"
+#include "../security/identity-certificate.hpp"
+#include "../security/sec-rule-specific.hpp"
+
+
+namespace ndn
+{
+
+class CommandInterestValidator : public Validator
+{
+public:
+  static const ssize_t POS_SIG_VALUE;
+  static const ssize_t POS_SIG_INFO;
+  static const ssize_t POS_RANDOM_VAL;
+  static const ssize_t POS_TIMESTAMP;
+  static const int64_t GRACE_INTERVAL;
+
+  CommandInterestValidator(int64_t graceInterval = GRACE_INTERVAL) 
+  { m_graceInterval = (graceInterval < 0 ? GRACE_INTERVAL : graceInterval); }
+
+  virtual
+  ~CommandInterestValidator() {}
+
+  inline void
+  addInterestRule(const std::string& regex, const IdentityCertificate& certificate);
+
+  inline void
+  addInterestRule(const std::string& regex, const Name& keyName, const PublicKey& publicKey);
+
+protected:
+  virtual void
+  checkPolicy (const Data& data, 
+               int stepCount, 
+               const OnDataValidated &onValidated, 
+               const OnDataValidationFailed &onValidationFailed,
+               std::vector<shared_ptr<ValidationRequest> > &nextSteps)
+  { onValidationFailed(data.shared_from_this()); }
+  
+  virtual void
+  checkPolicy (const Interest& interest, 
+               int stepCount, 
+               const OnInterestValidated &onValidated, 
+               const OnInterestValidationFailed &onValidationFailed,
+               std::vector<shared_ptr<ValidationRequest> > &nextSteps);
+private:
+  int64_t m_graceInterval; //ms
+  std::map<Name, PublicKey> m_trustAnchorsForInterest;
+  std::list<SecRuleSpecific> m_trustScopeForInterest;
+  std::map<Name, uint64_t> m_lastTimestamp;
+};
+
+void
+CommandInterestValidator::addInterestRule(const std::string& regex, const IdentityCertificate& certificate)
+{
+  Name keyName = IdentityCertificate::certificateNameToPublicKeyName(certificate.getName());
+  addInterestRule(regex, keyName, certificate.getPublicKeyInfo());
+}
+
+void
+CommandInterestValidator::addInterestRule(const std::string& regex, const Name& keyName, const PublicKey& publicKey)
+{
+  m_trustAnchorsForInterest[keyName] = publicKey;
+  shared_ptr<Regex> interestRegex = make_shared<Regex>(regex);
+  shared_ptr<Regex> signerRegex = Regex::fromName(keyName, true);
+  m_trustScopeForInterest.push_back(SecRuleSpecific(interestRegex, signerRegex));
+}
+
+}//ndn
+
+#endif