diff --git a/tests/unit/security/pib/pib-data-fixture.cpp b/tests/unit/security/pib/pib-data-fixture.cpp
index 0d12fd5..e88c48e 100644
--- a/tests/unit/security/pib/pib-data-fixture.cpp
+++ b/tests/unit/security/pib/pib-data-fixture.cpp
@@ -24,6 +24,7 @@
 // #include "ndn-cxx/security/pib/pib-memory.hpp"
 // #include "ndn-cxx/security/tpm/tpm.hpp"
 // #include "ndn-cxx/security/tpm/back-end-mem.hpp"
+
 // #include <fstream>
 
 namespace ndn {
@@ -54,7 +55,7 @@
 //         cert.setFreshnessPeriod(1_h);
 //         cert.setContent(tpm.getPublicKey(keyName));
 
-//         // @TODO sign using the new KeyChain
+//         // TODO: sign using KeyChain
 //         SignatureInfo info;
 //         info.setSignatureType(tlv::SignatureSha256WithEcdsa);
 //         info.setKeyLocator(KeyLocator(keyName));
@@ -65,8 +66,7 @@
 //         EncodingBuffer buf;
 //         cert.wireEncode(buf, true);
 
-//         cert.setSignatureValue(Block(tlv::SignatureValue,
-//                                      tpm.sign(buf.buf(), buf.size(), keyName, DigestAlgorithm::SHA256)));
+//         cert.setSignatureValue(tpm.sign(buf.buf(), buf.size(), keyName, DigestAlgorithm::SHA256));
 
 //         printBytes(prefix + "_KEY" + to_string(keyId) + "_CERT" + to_string(certVersion),
 //                    cert.wireEncode());
diff --git a/tests/unit/security/pib/pib-impl.t.cpp b/tests/unit/security/pib/pib-impl.t.cpp
index 7b13306..24d2b86 100644
--- a/tests/unit/security/pib/pib-impl.t.cpp
+++ b/tests/unit/security/pib/pib-impl.t.cpp
@@ -331,8 +331,8 @@
   // Create a fake cert with the same name
   auto cert2 = this->id1Key2Cert1;
   cert2.setName(this->id1Key1Cert1.getName());
-  cert2.setSignatureInfo(this->id1Key2Cert1.getSignatureInfo());
-  cert2.setSignatureValue(this->id1Key2Cert1.getSignatureValue());
+  BOOST_CHECK_EQUAL(cert2.getSignatureInfo(), this->id1Key2Cert1.getSignatureInfo());
+  BOOST_CHECK_EQUAL(cert2.getSignatureValue(), this->id1Key2Cert1.getSignatureValue());
   this->pib.addCertificate(cert2);
 
   auto cert3 = this->pib.getCertificate(this->id1Key1Cert1.getName());
diff --git a/tests/unit/security/v2/certificate.t.cpp b/tests/unit/security/v2/certificate.t.cpp
index dc1d8b5..0d848fd 100644
--- a/tests/unit/security/v2/certificate.t.cpp
+++ b/tests/unit/security/v2/certificate.t.cpp
@@ -63,17 +63,14 @@
 };
 
 const uint8_t SIG_VALUE[] = {
-  0x17, 0x80, // SignatureValue
-    0x2f, 0xd6, 0xf1, 0x6e, 0x80, 0x6f, 0x10, 0xbe, 0xb1, 0x6f, 0x3e, 0x31, 0xec,
-    0xe3, 0xb9, 0xea, 0x83, 0x30, 0x40, 0x03, 0xfc, 0xa0, 0x13, 0xd9, 0xb3, 0xc6,
-    0x25, 0x16, 0x2d, 0xa6, 0x58, 0x41, 0x69, 0x62, 0x56, 0xd8, 0xb3, 0x6a, 0x38,
-    0x76, 0x56, 0xea, 0x61, 0xb2, 0x32, 0x70, 0x1c, 0xb6, 0x4d, 0x10, 0x1d, 0xdc,
-    0x92, 0x8e, 0x52, 0xa5, 0x8a, 0x1d, 0xd9, 0x96, 0x5e, 0xc0, 0x62, 0x0b, 0xcf,
-    0x3a, 0x9d, 0x7f, 0xca, 0xbe, 0xa1, 0x41, 0x71, 0x85, 0x7a, 0x8b, 0x5d, 0xa9,
-    0x64, 0xd6, 0x66, 0xb4, 0xe9, 0x8d, 0x0c, 0x28, 0x43, 0xee, 0xa6, 0x64, 0xe8,
-    0x55, 0xf6, 0x1c, 0x19, 0x0b, 0xef, 0x99, 0x25, 0x1e, 0xdc, 0x78, 0xb3, 0xa7,
-    0xaa, 0x0d, 0x14, 0x58, 0x30, 0xe5, 0x37, 0x6a, 0x6d, 0xdb, 0x56, 0xac, 0xa3,
-    0xfc, 0x90, 0x7a, 0xb8, 0x66, 0x9c, 0x0e, 0xf6, 0xb7, 0x64, 0xd1
+  0x2f, 0xd6, 0xf1, 0x6e, 0x80, 0x6f, 0x10, 0xbe, 0xb1, 0x6f, 0x3e, 0x31, 0xec, 0xe3, 0xb9, 0xea,
+  0x83, 0x30, 0x40, 0x03, 0xfc, 0xa0, 0x13, 0xd9, 0xb3, 0xc6, 0x25, 0x16, 0x2d, 0xa6, 0x58, 0x41,
+  0x69, 0x62, 0x56, 0xd8, 0xb3, 0x6a, 0x38, 0x76, 0x56, 0xea, 0x61, 0xb2, 0x32, 0x70, 0x1c, 0xb6,
+  0x4d, 0x10, 0x1d, 0xdc, 0x92, 0x8e, 0x52, 0xa5, 0x8a, 0x1d, 0xd9, 0x96, 0x5e, 0xc0, 0x62, 0x0b,
+  0xcf, 0x3a, 0x9d, 0x7f, 0xca, 0xbe, 0xa1, 0x41, 0x71, 0x85, 0x7a, 0x8b, 0x5d, 0xa9, 0x64, 0xd6,
+  0x66, 0xb4, 0xe9, 0x8d, 0x0c, 0x28, 0x43, 0xee, 0xa6, 0x64, 0xe8, 0x55, 0xf6, 0x1c, 0x19, 0x0b,
+  0xef, 0x99, 0x25, 0x1e, 0xdc, 0x78, 0xb3, 0xa7, 0xaa, 0x0d, 0x14, 0x58, 0x30, 0xe5, 0x37, 0x6a,
+  0x6d, 0xdb, 0x56, 0xac, 0xa3, 0xfc, 0x90, 0x7a, 0xb8, 0x66, 0x9c, 0x0e, 0xf6, 0xb7, 0x64, 0xd1,
 };
 
 const uint8_t CERT[] = {
@@ -136,7 +133,7 @@
                                                  time::fromIsoString("20141111T060000")));
 
   data.setSignatureInfo(signatureInfo);
-  data.setSignatureValue(Block(SIG_VALUE, sizeof(SIG_VALUE)));
+  data.setSignatureValue(make_shared<Buffer>(SIG_VALUE, sizeof(SIG_VALUE)));
 }
 
 BOOST_AUTO_TEST_CASE(Construction)
@@ -149,8 +146,10 @@
   BOOST_CHECK_EQUAL(certificate.getIdentity(), "/ndn/site1");
   BOOST_CHECK_EQUAL(certificate.getIssuerId(), name::Component("0123"));
   BOOST_CHECK_EQUAL(certificate.getKeyId(), name::Component("ksk-1416425377094"));
-  BOOST_CHECK_EQUAL(certificate.getSignatureInfo().getKeyLocator().getName(), "/ndn/site1/KEY/ksk-2516425377094");
-  BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(certificate.getValidityPeriod()), "(20150814T223739, 20150818T223738)");
+  BOOST_REQUIRE_EQUAL(certificate.getKeyLocator().has_value(), true);
+  BOOST_CHECK_EQUAL(certificate.getKeyLocator()->getName(), "/ndn/site1/KEY/ksk-2516425377094");
+  BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(certificate.getValidityPeriod()),
+                    "(20150814T223739, 20150818T223738)");
 
   BOOST_CHECK_THROW(certificate.getExtension(12345), ndn::SignatureInfo::Error);
   BOOST_CHECK_NO_THROW(certificate.getPublicKey());
@@ -173,8 +172,10 @@
   BOOST_CHECK_EQUAL(certificate.getIdentity(), "/ndn/site1");
   BOOST_CHECK_EQUAL(certificate.getIssuerId(), name::Component("0123"));
   BOOST_CHECK_EQUAL(certificate.getKeyId(), name::Component("ksk-1416425377094"));
-  BOOST_CHECK_EQUAL(certificate.getSignatureInfo().getKeyLocator().getName(), "/ndn/site1/KEY/ksk-2516425377094");
-  BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(certificate.getValidityPeriod()), "(20141111T050000, 20141111T060000)");
+  BOOST_REQUIRE_EQUAL(certificate.getKeyLocator().has_value(), true);
+  BOOST_CHECK_EQUAL(certificate.getKeyLocator()->getName(), "/ndn/site1/KEY/ksk-2516425377094");
+  BOOST_CHECK_EQUAL(boost::lexical_cast<std::string>(certificate.getValidityPeriod()),
+                    "(20141111T050000, 20141111T060000)");
 
   BOOST_CHECK_THROW(certificate.getExtension(12345), ndn::SignatureInfo::Error);
   BOOST_CHECK_NO_THROW(certificate.getPublicKey());
diff --git a/tests/unit/security/v2/key-chain.t.cpp b/tests/unit/security/v2/key-chain.t.cpp
index b065fb2..ee19346 100644
--- a/tests/unit/security/v2/key-chain.t.cpp
+++ b/tests/unit/security/v2/key-chain.t.cpp
@@ -355,7 +355,7 @@
     Signature interestSignature(interest.getName()[-2].blockFromValue(), interest.getName()[-1].blockFromValue());
 
     if (signingInfo.getSignerType() == SigningInfo::SIGNER_TYPE_SHA256) {
-      BOOST_CHECK_EQUAL(data.getSignatureInfo().getSignatureType(), tlv::DigestSha256);
+      BOOST_CHECK_EQUAL(data.getSignatureType(), tlv::DigestSha256);
       BOOST_CHECK_EQUAL(interestSignature.getType(), tlv::DigestSha256);
 
       BOOST_CHECK(verifyDigest(data, DigestAlgorithm::SHA256));
@@ -363,17 +363,17 @@
     }
     else if (signingInfo.getSignerType() == SigningInfo::SIGNER_TYPE_HMAC) {
       Name keyName = signingInfo.getSignerName();
-      BOOST_CHECK_EQUAL(data.getSignatureInfo().getSignatureType(), tlv::SignatureHmacWithSha256);
+      BOOST_CHECK_EQUAL(data.getSignatureType(), tlv::SignatureHmacWithSha256);
       BOOST_CHECK_EQUAL(interestSignature.getType(), tlv::SignatureHmacWithSha256);
 
       BOOST_CHECK(bool(verifySignature(data, tpm, keyName, DigestAlgorithm::SHA256)));
       BOOST_CHECK(bool(verifySignature(interest, tpm, keyName, DigestAlgorithm::SHA256)));
     }
     else {
-      BOOST_CHECK_EQUAL(data.getSignatureInfo().getSignatureType(), tlv::SignatureSha256WithEcdsa);
+      BOOST_CHECK_EQUAL(data.getSignatureType(), tlv::SignatureSha256WithEcdsa);
       BOOST_CHECK_EQUAL(interestSignature.getType(), tlv::SignatureSha256WithEcdsa);
 
-      BOOST_CHECK_EQUAL(data.getSignatureInfo().getKeyLocator().getName(), cert.getName().getPrefix(-2));
+      BOOST_CHECK_EQUAL(data.getKeyLocator()->getName(), cert.getName().getPrefix(-2));
       BOOST_CHECK_EQUAL(interestSignature.getKeyLocator().getName(), cert.getName().getPrefix(-2));
 
       BOOST_CHECK(verifySignature(data, key));
@@ -392,16 +392,18 @@
   // Create identity with EC key and the corresponding self-signed certificate
   Identity id = addIdentity("/ndn/test/ec", EcKeyParams());
   BOOST_CHECK_NO_THROW(m_keyChain.sign(data, signingByIdentity(id.getName())));
-  BOOST_CHECK_EQUAL(data.getSignatureInfo().getSignatureType(),
+  BOOST_CHECK_EQUAL(data.getSignatureType(),
                     KeyChain::getSignatureType(EcKeyParams().getKeyType(), DigestAlgorithm::SHA256));
-  BOOST_CHECK(id.getName().isPrefixOf(data.getSignatureInfo().getKeyLocator().getName()));
+  BOOST_REQUIRE(data.getKeyLocator().has_value());
+  BOOST_CHECK(id.getName().isPrefixOf(data.getKeyLocator()->getName()));
 
   // Create identity with RSA key and the corresponding self-signed certificate
   id = addIdentity("/ndn/test/rsa", RsaKeyParams());
   BOOST_CHECK_NO_THROW(m_keyChain.sign(data, signingByIdentity(id.getName())));
-  BOOST_CHECK_EQUAL(data.getSignatureInfo().getSignatureType(),
+  BOOST_CHECK_EQUAL(data.getSignatureType(),
                     KeyChain::getSignatureType(RsaKeyParams().getKeyType(), DigestAlgorithm::SHA256));
-  BOOST_CHECK(id.getName().isPrefixOf(data.getSignatureInfo().getKeyLocator().getName()));
+  BOOST_REQUIRE(data.getKeyLocator().has_value());
+  BOOST_CHECK(id.getName().isPrefixOf(data.getKeyLocator()->getName()));
 }
 
 BOOST_FIXTURE_TEST_CASE(ImportPrivateKey, IdentityManagementFixture)
diff --git a/tests/unit/security/v2/validator.t.cpp b/tests/unit/security/v2/validator.t.cpp
index 934492f..b5a7e04 100644
--- a/tests/unit/security/v2/validator.t.cpp
+++ b/tests/unit/security/v2/validator.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2018 Regents of the University of California.
+ * Copyright (c) 2013-2020 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -316,8 +316,8 @@
     request.setName(Name(key.getName()).append("looper").appendVersion());
 
     SignatureInfo info;
-    info.setValidityPeriod({time::system_clock::now() - 100_days,
-                            time::system_clock::now() + 100_days});
+    info.setValidityPeriod(ValidityPeriod(time::system_clock::now() - 100_days,
+                                          time::system_clock::now() + 100_days));
     m_keyChain.sign(request, signingByKey(signer).setSignatureInfo(info));
     m_keyChain.addCertificate(key, request);