Index: clang-tidy/cert/CERTTidyModule.cpp
===================================================================
--- clang-tidy/cert/CERTTidyModule.cpp
+++ clang-tidy/cert/CERTTidyModule.cpp
@@ -18,6 +18,7 @@
 #include "../misc/ThrowByValueCatchByReferenceCheck.h"
 #include "CommandProcessorCheck.h"
 #include "FloatLoopCounter.h"
+#include "LimitedRandomnessCheck.h"
 #include "SetLongJmpCheck.h"
 #include "StaticObjectExceptionCheck.h"
 #include "StrToNumCheck.h"
@@ -33,6 +34,8 @@
   void addCheckFactories(ClangTidyCheckFactories &CheckFactories) override {
     // C++ checkers
     // DCL
+    CheckFactories.registerCheck<LimitedRandomnessCheck>(
+        "cert-msc50-cpp");
     CheckFactories.registerCheck<VariadicFunctionDefCheck>(
         "cert-dcl50-cpp");
     CheckFactories.registerCheck<misc::NewDeleteOverloadsCheck>(
Index: clang-tidy/cert/CMakeLists.txt
===================================================================
--- clang-tidy/cert/CMakeLists.txt
+++ clang-tidy/cert/CMakeLists.txt
@@ -4,6 +4,7 @@
   CERTTidyModule.cpp
   CommandProcessorCheck.cpp
   FloatLoopCounter.cpp
+  LimitedRandomnessCheck.cpp
   SetLongJmpCheck.cpp
   StaticObjectExceptionCheck.cpp
   StrToNumCheck.cpp
Index: clang-tidy/cert/LimitedRandomnessCheck.h
===================================================================
--- /dev/null
+++ clang-tidy/cert/LimitedRandomnessCheck.h
@@ -0,0 +1,37 @@
+//===--- LimitedRandomnessCheck.h - clang-tidy-------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CERT_LIMITED_RANDOMNESS_H
+#define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CERT_LIMITED_RANDOMNESS_H
+
+#include "../ClangTidy.h"
+
+namespace clang {
+namespace tidy {
+namespace cert {
+
+/// Pseudorandom number generators are not genuinely random. This checker warns
+/// for the usage of std::rand() function.
+///
+/// For the user-facing documentation see:
+/// http://clang.llvm.org/extra/clang-tidy/checks/cert-msc50-cpp.html
+class LimitedRandomnessCheck : public ClangTidyCheck {
+public:
+  LimitedRandomnessCheck(StringRef Name, ClangTidyContext *Context)
+      : ClangTidyCheck(Name, Context) {}
+  void registerMatchers(ast_matchers::MatchFinder *Finder) override;
+  void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
+};
+
+} // namespace cert
+} // namespace tidy
+} // namespace clang
+
+#endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_CERT_LIMITED_RANDOMNESS_H
+
Index: clang-tidy/cert/LimitedRandomnessCheck.cpp
===================================================================
--- /dev/null
+++ clang-tidy/cert/LimitedRandomnessCheck.cpp
@@ -0,0 +1,37 @@
+//===--- LimitedRandomnessCheck.cpp - clang-tidy---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "LimitedRandomnessCheck.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/ASTMatchers/ASTMatchFinder.h"
+
+using namespace clang::ast_matchers;
+
+namespace clang {
+namespace tidy {
+namespace cert {
+
+void LimitedRandomnessCheck::registerMatchers(MatchFinder *Finder) {
+  Finder->addMatcher(
+      declRefExpr(hasDeclaration(functionDecl(namedDecl(hasName("::rand")),
+                                              parameterCountIs(0))))
+          .bind("randomGenerator"),
+      this);
+}
+
+void LimitedRandomnessCheck::check(const MatchFinder::MatchResult &Result) {
+  const auto *MatchedDecl =
+      Result.Nodes.getNodeAs<DeclRefExpr>("randomGenerator");
+  diag(MatchedDecl->getLocation(), "rand() function has limited randomness, "
+                                   "use C++11 random library instead");
+}
+
+} // namespace cert
+} // namespace tidy
+} // namespace clang
Index: docs/clang-tidy/checks/cert-msc50-cpp.rst
===================================================================
--- /dev/null
+++ docs/clang-tidy/checks/cert-msc50-cpp.rst
@@ -0,0 +1,6 @@
+.. title:: clang-tidy - cert-msc50-cpp
+
+cert-msc-50
+=======================
+
+Pseudorandom number generators use mathematical algorithms to produce a sequence of numbers with good statistical properties, but the numbers produced are not genuinely random. This checker warns for the usage of std::rand().
Index: docs/clang-tidy/checks/list.rst
===================================================================
--- docs/clang-tidy/checks/list.rst
+++ docs/clang-tidy/checks/list.rst
@@ -17,6 +17,7 @@
    cert-err61-cpp (redirects to misc-throw-by-value-catch-by-reference) <cert-err61-cpp>
    cert-fio38-c (redirects to misc-non-copyable-objects) <cert-fio38-c>
    cert-flp30-c
+   cert-msc50-cpp
    cert-oop11-cpp (redirects to misc-move-constructor-init) <cert-oop11-cpp>
    cppcoreguidelines-interfaces-global-init
    cppcoreguidelines-pro-bounds-array-to-pointer-decay
Index: test/clang-tidy/cert-limited-randomness.cpp
===================================================================
--- /dev/null
+++ test/clang-tidy/cert-limited-randomness.cpp
@@ -0,0 +1,28 @@
+// RUN: %check_clang_tidy %s cert-msc50-cpp %t
+
+int rand();
+int rand(int);
+
+namespace std {
+using ::rand;
+}
+
+namespace nonstd {
+  int rand();
+}
+
+void testFunction1() {
+  int i = std::rand();
+  // CHECK-MESSAGES: :[[@LINE-1]]:16: warning: rand() function has limited randomness, use C++11 random library instead [cert-msc50-cpp]
+
+  int j = ::rand();
+  // CHECK-MESSAGES: :[[@LINE-1]]:13: warning: rand() function has limited randomness, use C++11 random library instead [cert-msc50-cpp]
+
+  int k = rand(i);
+
+  int l = nonstd::rand();
+
+  int m = rand();
+  // CHECK-MESSAGES: :[[@LINE-1]]:11: warning: rand() function has limited randomness, use C++11 random library instead [cert-msc50-cpp]
+}
+