diff --git a/pgpainless-core/src/test/kotlin/org/pgpainless/key/KeyWithUnknownSecretKeyEncryptionMethodTest.kt b/pgpainless-core/src/test/kotlin/org/pgpainless/key/KeyWithUnknownSecretKeyEncryptionMethodTest.kt
new file mode 100644
index 00000000..253c0f19
--- /dev/null
+++ b/pgpainless-core/src/test/kotlin/org/pgpainless/key/KeyWithUnknownSecretKeyEncryptionMethodTest.kt
@@ -0,0 +1,43 @@
+// SPDX-FileCopyrightText: 2024 Paul Schaub <vanitasvitae@fsfe.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.key
+
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.Assertions.assertNotNull
+import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.Test
+import org.pgpainless.PGPainless
+
+class KeyWithUnknownSecretKeyEncryptionMethodTest {
+
+    // Test vector from https://gitlab.com/dkg/openpgp-hardware-secrets/-/merge_requests/2
+    val KEY =
+        """-----BEGIN PGP PRIVATE KEY BLOCK-----
+
+xTQEZgWtcxYJKwYBBAHaRw8BAQdAlLK6UPQsVHR2ETk1SwVIG3tBmpiEtikYYlCy
+1TIiqzb8zR08aGFyZHdhcmUtc2VjcmV0QGV4YW1wbGUub3JnPsKNBBAWCAA1AhkB
+BQJmBa1zAhsDCAsJCAcKDQwLBRUKCQgLAhYCFiEEXlP8Tur0WZR+f0I33/i9Uh4O
+HEkACgkQ3/i9Uh4OHEnryAD8CzH2ajJvASp46ApfI4pLPY57rjBX++d/2FQPRyqG
+HJUA/RLsNNgxiFYmK5cjtQe2/DgzWQ7R6PxPC6oa3XM7xPcCxzkEZgWtcxIKKwYB
+BAGXVQEFAQEHQE1YXOKeaklwG01Yab4xopP9wbu1E+pCrP1xQpiFZW5KAwEIB/zC
+eAQYFggAIAUCZgWtcwIbDBYhBF5T/E7q9FmUfn9CN9/4vVIeDhxJAAoJEN/4vVIe
+DhxJVTgA/1WaFrKdP3AgL0Ffdooc5XXbjQsj0uHo6FZSHRI4pchMAQCyJnKQ3RvW
+/0gm41JCqImyg2fxWG4hY0N5Q7Rc6PyzDQ==
+=3w/O
+-----END PGP PRIVATE KEY BLOCK-----"""
+
+    @Test
+    @Disabled("Disabled since BC 1.77 chokes on the test key")
+    fun testExtractCertificate() {
+        val key = PGPainless.readKeyRing().secretKeyRing(KEY)!!
+        val cert = PGPainless.extractCertificate(key)
+
+        assertNotNull(cert)
+        // Each secret key got its public key component extracted
+        assertEquals(
+            key.secretKeys.asSequence().map { it.keyID }.toSet(),
+            cert.publicKeys.asSequence().map { it.keyID }.toSet())
+    }
+}