diff --git a/src/name-assignments/assignment-param.cpp b/src/name-assignments/assignment-param.cpp
new file mode 100644
index 0000000..83de6a4
--- /dev/null
+++ b/src/name-assignments/assignment-param.cpp
@@ -0,0 +1,63 @@
+//
+// Created by Tyler on 10/6/20.
+//
+
+#include "assignment-param.hpp"
+
+namespace ndn {
+namespace ndncert {
+
+_LOG_INIT(ndncert.assignment.param);
+NDNCERT_REGISTER_FUNCFACTORY(AssignmentParam, "param");
+
+AssignmentParam::AssignmentParam()
+    : NameAssignmentFuncFactory("param")
+{
+}
+
+NameAssignmentFunc
+AssignmentParam::getFunction(const std::string &factoryParam) {
+    std::list<std::string> paramList;
+    size_t index = 0, startIndex = 0;
+    while ((index = factoryParam.find(":", startIndex)) != factoryParam.npos) {
+        paramList.push_back(factoryParam.substr(startIndex, index));
+        startIndex = index + 1;
+    }
+    if (startIndex != factoryParam.size()) {
+        paramList.push_back(factoryParam.substr(startIndex));
+    }
+    return ParamAssignmentFunc(paramList);
+}
+
+AssignmentParam::ParamAssignmentFunc::ParamAssignmentFunc(std::list<std::string> paramList)
+    : m_paramList(std::move(paramList))
+{}
+
+std::vector<PartialName>
+AssignmentParam::ParamAssignmentFunc::operator() (const std::vector<std::tuple<std::string, std::string>> params)
+{
+  if (params.size() > m_paramList.size() * 8) { // might be attack
+      BOOST_THROW_EXCEPTION(std::runtime_error("Too many extra parameters given"));
+  }
+  std::map<std::string, std::string> paramMap;
+  for (const auto& param : params) {
+      paramMap[std::get<0>(param)] = std::get<1>(param);
+  }
+
+  //construct name
+  PartialName name;
+  for (const auto& field : m_paramList) {
+      auto it = paramMap.find(field);
+      if (it == paramMap.end()) {
+          return std::vector<PartialName>();
+      } else {
+          name.append(it->second);
+      }
+  }
+  std::vector<PartialName> nameList;
+  nameList.push_back(name);
+  return nameList;
+}
+
+}
+}