diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/OpenPgpSignatureResultBuilder.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/OpenPgpSignatureResultBuilder.java
index a116ea665..a6a15d2e9 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/OpenPgpSignatureResultBuilder.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/OpenPgpSignatureResultBuilder.java
@@ -78,7 +78,7 @@ public class OpenPgpSignatureResultBuilder {
             if (mKnownKey) {
                 if (mValidSignature) {
                     result.setKeyId(mKeyId);
-                    result.setUserId(mUserId);
+                    result.setPrimaryUserId(mUserId);
 
                     if (mIsSignatureKeyCertified) {
                         Log.d(Constants.TAG, "SIGNATURE_SUCCESS_CERTIFIED");
@@ -94,8 +94,8 @@ public class OpenPgpSignatureResultBuilder {
             } else {
                 result.setKeyId(mKeyId);
 
-                Log.d(Constants.TAG, "SIGNATURE_UNKNOWN_PUB_KEY");
-                result.setStatus(OpenPgpSignatureResult.SIGNATURE_UNKNOWN_PUB_KEY);
+                Log.d(Constants.TAG, "SIGNATURE_KEY_MISSING");
+                result.setStatus(OpenPgpSignatureResult.SIGNATURE_KEY_MISSING);
             }
 
             return result;
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java
index 20dfac36d..cc9912c30 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/OpenPgpService.java
@@ -31,7 +31,6 @@ import org.openintents.openpgp.OpenPgpError;
 import org.openintents.openpgp.OpenPgpSignatureResult;
 import org.openintents.openpgp.util.OpenPgpApi;
 import org.openkeychain.nfc.NfcActivity;
-import org.spongycastle.util.Arrays;
 import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
 import org.sufficientlysecure.keychain.pgp.PgpDecryptVerify;
@@ -447,7 +446,15 @@ public class OpenPgpService extends RemoteService {
                 if (signatureResult != null) {
                     result.putExtra(OpenPgpApi.RESULT_SIGNATURE, signatureResult);
 
-                    if (signatureResult.getStatus() == OpenPgpSignatureResult.SIGNATURE_UNKNOWN_PUB_KEY) {
+                    if (data.getIntExtra(OpenPgpApi.EXTRA_API_VERSION, -1) < 5) {
+                        // SIGNATURE_KEY_REVOKED and SIGNATURE_KEY_EXPIRED have been added in version 5
+                        if (signatureResult.getStatus() == OpenPgpSignatureResult.SIGNATURE_KEY_REVOKED
+                                || signatureResult.getStatus() == OpenPgpSignatureResult.SIGNATURE_KEY_EXPIRED) {
+                            signatureResult.setStatus(OpenPgpSignatureResult.SIGNATURE_ERROR);
+                        }
+                    }
+
+                    if (signatureResult.getStatus() == OpenPgpSignatureResult.SIGNATURE_KEY_MISSING) {
                         // If signature is unknown we return an _additional_ PendingIntent
                         // to retrieve the missing key
                         Intent intent = new Intent(getBaseContext(), ImportKeysActivity.class);
@@ -577,9 +584,10 @@ public class OpenPgpService extends RemoteService {
 
         // version code is required and needs to correspond to version code of service!
         // History of versions in org.openintents.openpgp.util.OpenPgpApi
-        // we support 3 and 4
+        // we support 3, 4, 5
         if (data.getIntExtra(OpenPgpApi.EXTRA_API_VERSION, -1) != 3
-                && data.getIntExtra(OpenPgpApi.EXTRA_API_VERSION, -1) != 4) {
+                && data.getIntExtra(OpenPgpApi.EXTRA_API_VERSION, -1) != 4
+                && data.getIntExtra(OpenPgpApi.EXTRA_API_VERSION, -1) != 5) {
             Intent result = new Intent();
             OpenPgpError error = new OpenPgpError
                     (OpenPgpError.INCOMPATIBLE_API_VERSIONS, "Incompatible API versions!\n"
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptFragment.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptFragment.java
index 211a20ec8..9abe48d64 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptFragment.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/DecryptFragment.java
@@ -110,7 +110,7 @@ public abstract class DecryptFragment extends Fragment {
 
             mSignatureKeyId = signatureResult.getKeyId();
 
-            String userId = signatureResult.getUserId();
+            String userId = signatureResult.getPrimaryUserId();
             String[] userIdSplit = KeyRing.splitUserId(userId);
             if (userIdSplit[0] != null) {
                 mUserId.setText(userIdSplit[0]);
@@ -153,7 +153,7 @@ public abstract class DecryptFragment extends Fragment {
                     break;
                 }
 
-                case OpenPgpSignatureResult.SIGNATURE_UNKNOWN_PUB_KEY: {
+                case OpenPgpSignatureResult.SIGNATURE_KEY_MISSING: {
                     if (signatureResult.isSignatureOnly()) {
                         mResultText.setText(R.string.decrypt_result_signature_unknown_pub_key);
                     } else {
diff --git a/OpenKeychain/src/main/res/values/strings.xml b/OpenKeychain/src/main/res/values/strings.xml
index 2a2d18c0d..b451939cf 100644
--- a/OpenKeychain/src/main/res/values/strings.xml
+++ b/OpenKeychain/src/main/res/values/strings.xml
@@ -596,7 +596,7 @@
     <!-- Keyring Canonicalization log entries -->
     <string name="msg_kc_public">Canonicalizing public keyring %s</string>
     <string name="msg_kc_secret">Canonicalizing secret keyring %s</string>
-    <string name="msg_kc_error_v3">This is an OpenPGP version 3 key, which have been deprecated and are no longer supported!</string>
+    <string name="msg_kc_error_v3">This is an OpenPGP version 3 key, which has been deprecated and is no longer supported!</string>
     <string name="msg_kc_error_no_uid">Keyring has no valid user ids!</string>
     <string name="msg_kc_error_master_algo">The master key uses an unknown (%s) algorithm!</string>
     <string name="msg_kc_master">Processing master key</string>
@@ -604,7 +604,7 @@
     <string name="msg_kc_revoke_bad_local">Removing keyring revocation certificate with "local" flag</string>
     <string name="msg_kc_revoke_bad_time">Removing keyring revocation certificate with future timestamp</string>
     <string name="msg_kc_revoke_bad_type">Removing master key certificate of unknown type (%s)</string>
-    <string name="msg_kc_revoke_bad_type_uid">Removing user id certification in bad position</string>
+    <string name="msg_kc_revoke_bad_type_uid">Removing user id certificate in bad position</string>
     <string name="msg_kc_revoke_bad">Removing bad keyring revocation certificate</string>
     <string name="msg_kc_revoke_dup">Removing redundant keyring revocation certificate</string>
     <string name="msg_kc_sub">Processing subkey %s</string>
@@ -644,7 +644,7 @@
     <string name="msg_kc_uid_revoke_old">Removing outdated revocation certificate for user id "%s"</string>
     <string name="msg_kc_uid_no_cert">No valid self-certificate found for user id %s, removing from ring</string>
     <string name="msg_kc_uid_remove">Removing invalid user id %s</string>
-    <string name="msg_kc_uid_dup">Removing duplicate user id "%s". The secret key contained two of them. This may result in missing certifications!</string>
+    <string name="msg_kc_uid_dup">Removing duplicate user id "%s". The secret key contained two of them. This may result in missing certificates!</string>
 
     <!-- Keyring merging log entries -->
     <string name="msg_mg_error_secret_dummy">New public subkey found, but secret subkey dummy generation is not supported!</string>
diff --git a/extern/openpgp-api-lib b/extern/openpgp-api-lib
index 1d0eeef04..8b36d2866 160000
--- a/extern/openpgp-api-lib
+++ b/extern/openpgp-api-lib
@@ -1 +1 @@
-Subproject commit 1d0eeef047c4938f4e25bc06f7e92e83aa46a4c4
+Subproject commit 8b36d286680ee57b2181e86a3f02ba1278a81166