diff --git a/include/mcl/aggregate_sig.hpp b/include/mcl/aggregate_sig.hpp
index f314057..9ee824c 100644
--- a/include/mcl/aggregate_sig.hpp
+++ b/include/mcl/aggregate_sig.hpp
@@ -62,16 +62,32 @@ public:
 		friend class SecretKey;
 		friend class PublicKey;
 	public:
+		template<class InputStream>
+		void load(bool *pb, InputStream& is, int ioMode = IoSerialize)
+		{
+			S_.load(pb, is, ioMode);
+		}
+		template<class OutputStream>
+		void save(bool *pb, OutputStream& os, int ioMode = IoSerialize) const
+		{
+			S_.save(pb, os, ioMode);
+		}
+#ifndef CYBOZU_DONT_USE_EXCEPTION
 		template<class InputStream>
 		void load(InputStream& is, int ioMode = IoSerialize)
 		{
-			S_.load(is, ioMode);
+			bool b;
+			load(&b, is, ioMode);
+			if (!b) throw cybozu::Exception("Signature:load");
 		}
 		template<class OutputStream>
 		void save(OutputStream& os, int ioMode = IoSerialize) const
 		{
-			S_.save(os, ioMode);
+			bool b;
+			save(&b, os, ioMode);
+			if (!b) throw cybozu::Exception("Signature:save");
 		}
+#endif
 		friend std::istream& operator>>(std::istream& is, Signature& self)
 		{
 			self.load(is, fp::detectIoMode(G1::getIoMode(), is));
@@ -155,16 +171,32 @@ public:
 		friend class SecretKey;
 		friend class Signature;
 	public:
+		template<class InputStream>
+		void load(bool *pb, InputStream& is, int ioMode = IoSerialize)
+		{
+			xQ_.load(pb, is, ioMode);
+		}
+		template<class OutputStream>
+		void save(bool *pb, OutputStream& os, int ioMode = IoSerialize) const
+		{
+			xQ_.save(pb, os, ioMode);
+		}
+#ifndef CYBOZU_DONT_USE_EXCEPTION
 		template<class InputStream>
 		void load(InputStream& is, int ioMode = IoSerialize)
 		{
-			xQ_.load(is, ioMode);
+			bool b;
+			load(&b, is, ioMode);
+			if (!b) throw cybozu::Exception("PublicKey:load");
 		}
 		template<class OutputStream>
 		void save(OutputStream& os, int ioMode = IoSerialize) const
 		{
-			xQ_.save(os, ioMode);
+			bool b;
+			save(&b, os, ioMode);
+			if (!b) throw cybozu::Exception("PublicKey:save");
 		}
+#endif
 		friend std::istream& operator>>(std::istream& is, PublicKey& self)
 		{
 			self.load(is, fp::detectIoMode(G2::getIoMode(), is));
@@ -208,16 +240,32 @@ public:
 		friend class PublicKey;
 		friend class Signature;
 	public:
+		template<class InputStream>
+		void load(bool *pb, InputStream& is, int ioMode = IoSerialize)
+		{
+			x_.load(pb, is, ioMode);
+		}
+		template<class OutputStream>
+		void save(bool *pb, OutputStream& os, int ioMode = IoSerialize) const
+		{
+			x_.save(pb, os, ioMode);
+		}
+#ifndef CYBOZU_DONT_USE_EXCEPTION
 		template<class InputStream>
 		void load(InputStream& is, int ioMode = IoSerialize)
 		{
-			x_.load(is, ioMode);
+			bool b;
+			load(&b, is, ioMode);
+			if (!b) throw cybozu::Exception("SecretKey:load");
 		}
 		template<class OutputStream>
 		void save(OutputStream& os, int ioMode = IoSerialize) const
 		{
-			x_.save(os, ioMode);
+			bool b;
+			save(&b, os, ioMode);
+			if (!b) throw cybozu::Exception("SecretKey:save");
 		}
+#endif
 		friend std::istream& operator>>(std::istream& is, SecretKey& self)
 		{
 			self.load(is, fp::detectIoMode(Fr::getIoMode(), is));
diff --git a/test/aggregate_sig_test.cpp b/test/aggregate_sig_test.cpp
index c3a0e75..33b8609 100644
--- a/test/aggregate_sig_test.cpp
+++ b/test/aggregate_sig_test.cpp
@@ -21,6 +21,36 @@ CYBOZU_TEST_AUTO(init)
 	CYBOZU_TEST_ASSERT(pub.verify(sig, m));
 }
 
+template<class T>
+void serializeTest(const T& x)
+{
+	std::stringstream ss;
+	ss << x;
+	T y;
+	ss >> y;
+	CYBOZU_TEST_EQUAL(x, y);
+	char buf[1024];
+	size_t n;
+	n = x.serialize(buf, sizeof(buf));
+	CYBOZU_TEST_ASSERT(n > 0);
+	T z;
+	CYBOZU_TEST_EQUAL(z.deserialize(buf, n), n);
+	CYBOZU_TEST_EQUAL(x, z);
+}
+
+CYBOZU_TEST_AUTO(serialize)
+{
+	SecretKey sec;
+	sec.init();
+	PublicKey pub;
+	sec.getPublicKey(pub);
+	Signature sig;
+	sec.sign(sig, "abc");
+	serializeTest(sec);
+	serializeTest(pub);
+	serializeTest(sig);
+}
+
 void aggregateTest(const std::vector<std::string>& msgVec)
 {
 	const size_t n = msgVec.size();