diff --git a/app/src/main/java/eu/faircode/email/FragmentMessages.java b/app/src/main/java/eu/faircode/email/FragmentMessages.java
index 01e691916f..e1645c0531 100644
--- a/app/src/main/java/eu/faircode/email/FragmentMessages.java
+++ b/app/src/main/java/eu/faircode/email/FragmentMessages.java
@@ -10142,6 +10142,10 @@ public class FragmentMessages extends FragmentBase
                                         EntityCertificate record = db.certificate().getCertificate(fingerprint, email);
                                         if (record == null)
                                             known = false;
+                                        else {
+                                            args.putString("keyalgo", record.getSigAlgName());
+                                            break;
+                                        }
                                     }
 
                                     String sender = null;
@@ -10407,6 +10411,7 @@ public class FragmentMessages extends FragmentBase
                             boolean valid = args.getBoolean("valid");
                             String reason = args.getString("reason");
                             String algo = args.getString("algo");
+                            String keyalgo = args.getString("keyalgo");
                             final ArrayList<String> trace = args.getStringArrayList("trace");
                             EntityCertificate record = EntityCertificate.from(cert, null);
 
@@ -10438,6 +10443,8 @@ public class FragmentMessages extends FragmentBase
                                 TextView tvBefore = dview.findViewById(R.id.tvBefore);
                                 TextView tvExpired = dview.findViewById(R.id.tvExpired);
                                 TextView tvAlgorithm = dview.findViewById(R.id.tvAlgorithm);
+                                TextView tvKeyAlgorithmTitle = dview.findViewById(R.id.tvKeyAlgorithmTitle);
+                                TextView tvKeyAlgorithm = dview.findViewById(R.id.tvKeyAlgorithm);
 
                                 tvCertificateInvalid.setVisibility(valid ? View.GONE : View.VISIBLE);
                                 tvCertificateReason.setText(reason);
@@ -10456,6 +10463,12 @@ public class FragmentMessages extends FragmentBase
                                     algo = algo.replace("(?i)With", "/");
                                 tvAlgorithm.setText(algo);
 
+                                tvKeyAlgorithmTitle.setVisibility(info ? View.VISIBLE : View.GONE);
+                                if (!TextUtils.isEmpty(keyalgo))
+                                    keyalgo = keyalgo.replaceAll("(?i)With", "/");
+                                tvKeyAlgorithm.setVisibility(info ? View.VISIBLE : View.GONE);
+                                tvKeyAlgorithm.setText(keyalgo);
+
                                 ibInfo.setOnClickListener(new View.OnClickListener() {
                                     @Override
                                     public void onClick(View v) {
diff --git a/app/src/main/res/layout/dialog_certificate.xml b/app/src/main/res/layout/dialog_certificate.xml
index 57334f4dca..1542346896 100644
--- a/app/src/main/res/layout/dialog_certificate.xml
+++ b/app/src/main/res/layout/dialog_certificate.xml
@@ -183,5 +183,24 @@
             android:textAppearance="@style/TextAppearance.AppCompat.Medium"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvAlgorithmTitle" />
+
+        <TextView
+            android:id="@+id/tvKeyAlgorithmTitle"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="24dp"
+            android:text="@string/title_signature_public_key"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvExpired" />
+
+        <TextView
+            android:id="@+id/tvKeyAlgorithm"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="SHA256withRSA"
+            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvAlgorithmTitle" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 </ScrollView>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 595fc03389..1d4848b0a4 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1933,6 +1933,7 @@
     <string name="title_signature_email">Signature\'s address</string>
     <string name="title_signature_mismatch">The email address of the sender and signature do not match</string>
     <string name="title_signature_algorithm">Algorithm</string>
+    <string name="title_signature_public_key">Public key</string>
     <string name="title_signature_subject">Subject</string>
     <string name="title_signature_validity">Validity</string>
     <string name="title_signature_outdated">This public key is currently not valid</string>