diff --git a/pgpainless-core/src/test/java/org/pgpainless/example/UnlockSecretKeys.java b/pgpainless-core/src/test/java/org/pgpainless/example/UnlockSecretKeys.java
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+/*
+ * Copyright 2021 Paul Schaub.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.pgpainless.example;
+
+import java.io.IOException;
+
+import org.bouncycastle.openpgp.PGPException;
+import org.bouncycastle.openpgp.PGPSecretKey;
+import org.bouncycastle.openpgp.PGPSecretKeyRing;
+import org.junit.jupiter.api.Test;
+import org.pgpainless.PGPainless;
+import org.pgpainless.exception.WrongPassphraseException;
+import org.pgpainless.key.OpenPgpV4Fingerprint;
+import org.pgpainless.key.TestKeys;
+import org.pgpainless.key.protection.CachingSecretKeyRingProtector;
+import org.pgpainless.key.protection.SecretKeyRingProtector;
+import org.pgpainless.key.protection.UnlockSecretKey;
+import org.pgpainless.util.Passphrase;
+
+/**
+ * {@link PGPSecretKey PGPSecretKeys} are often password protected to prevent unauthorized access.
+ * To perform certain actions with secret keys, such as creating signatures or decrypting encrypted messages,
+ * the secret key needs to be unlocked to access the underlying {@link org.bouncycastle.openpgp.PGPPrivateKey}.
+ *
+ * Providing the required {@link org.bouncycastle.openpgp.operator.PBESecretKeyEncryptor}/{@link org.bouncycastle.openpgp.operator.PBESecretKeyDecryptor}
+ * is a task that needs to be performed by the {@link SecretKeyRingProtector}.
+ * There are different implementations available that implement this interface.
+ *
+ * Below are some examples of how to use these implementations in different scenarios.
+ */
+public class UnlockSecretKeys {
+
+    /**
+     * This example demonstrates how to create a {@link SecretKeyRingProtector} for unprotected secret keys.
+     *
+     * @throws PGPException
+     * @throws IOException
+     */
+    @Test
+    public void unlockUnprotectedKeys() throws PGPException, IOException {
+        PGPSecretKeyRing unprotectedKey = TestKeys.getJulietSecretKeyRing();
+        // This protector will only unlock unprotected keys
+        SecretKeyRingProtector protector = SecretKeyRingProtector.unprotectedKeys();
+
+
+        assertProtectorUnlocksAllSecretKeys(unprotectedKey, protector);
+    }
+
+    /**
+     * This example demonstrates how to create a {@link SecretKeyRingProtector} using a single passphrase to unlock
+     * all secret subkeys of a key.
+     *
+     * @throws PGPException
+     * @throws IOException
+     */
+    @Test
+    public void unlockWholeKeyWithSamePassphrase() throws PGPException, IOException {
+        PGPSecretKeyRing secretKey = TestKeys.getCryptieSecretKeyRing();
+        // Unlock all subkeys in the secret key with the same passphrase
+        SecretKeyRingProtector protector = SecretKeyRingProtector.unlockAllKeysWith(
+                Passphrase.fromPassword(TestKeys.CRYPTIE_PASSWORD), secretKey);
+
+
+        assertProtectorUnlocksAllSecretKeys(secretKey, protector);
+    }
+
+    /**
+     * This example demonstrates how to create a {@link SecretKeyRingProtector} that uses different
+     * passphrases per subkey to unlock the secret keys.
+     *
+     * @throws PGPException
+     * @throws IOException
+     */
+    @Test
+    public void unlockWithPerSubkeyPassphrases() throws PGPException, IOException {
+        String pgpPrivateKeyBlock = "" +
+                "-----BEGIN PGP PRIVATE KEY BLOCK-----\n" +
+                "Version: PGPainless\n" +
+                "Comment: 4F28 5D16 A201 21BB 5B89  E76E 5D71 171E 059A 1D2F\n" +
+                "Comment: alice@pgpainless.org\n" +
+                "\n" +
+                "lIYEYNc8xhYJKwYBBAHaRw8BAQdAQiDSNqkU4b4TmdacOxi9mfw06pI23NNiTj/C\n" +
+                "K1P+Q0/+CQMCm+6zb2ORC8BgHltvucr4KKx7QZdO5jIDWDZe1DjeS2JsJXoqOMeK\n" +
+                "yjxB8aVoSZTmsAm1KMbeDWcqtsltgm+DipRUyWFxeYOoj+CugJ42GbQUYWxpY2VA\n" +
+                "cGdwYWlubGVzcy5vcmeIeAQTFgoAIAUCYNc8xgIbAQUWAgMBAAQLCQgHBRUKCQgL\n" +
+                "Ah4BAhkBAAoJEF1xFx4Fmh0viTEBAJmfpCJsVi7BzMh2iP6ecWZSRYtgqAhKjGTT\n" +
+                "4i9IKgIUAP47SbJr4qexi3jWj9W9ng//+CKEQ857Up6iSR6u+3poApyLBGDXPMYS\n" +
+                "CisGAQQBl1UBBQEBB0BUfOJMRcgWdPeyEz2kL79JfhckuDRAwZJyGd8mcFBofQMB\n" +
+                "CAf+CQMCKdEpNMEpflBguXamH33Vhx2tr3iYleiWI0VfhPrQledNzJ1uCHFH5q+k\n" +
+                "UnALeSCLJXIekPl3q1ux9C2MQkD/X4+mHh+fE4gSd1G5nd3oh4h1BBgWCgAdBQJg\n" +
+                "1zzGAhsMBRYCAwEABAsJCAcFFQoJCAsCHgEACgkQXXEXHgWaHS/8DgD/Qnpe5g6C\n" +
+                "WHeXvgg06PJR7HRPkpE5NSnqEWP9X0tPe2EBAIdTiDozZ7HL6NVI89MnLBkw+524\n" +
+                "y5YzlNpQn4Al3tMCnIYEYNc8xhYJKwYBBAHaRw8BAQdAXdTUv2F0XGfi4qFnIPrL\n" +
+                "YbOpEZIWYjGVf5Ggbs9OBrb+CQMClCGIqeO7yJlgR9z490pJUD4al/ATofqGPPqx\n" +
+                "VsTz4gl1IkkWKQn7GJv2AYn09jZgnWm2a7u16cS6HZLJjRl2XvMzMQp3dRsOPHTP\n" +
+                "nulJ7YjVBBgWCgB9BQJg1zzGAhsCBRYCAwEABAsJCAcFFQoJCAsCHgFfIAQZFgoA\n" +
+                "BgUCYNc8xgAKCRD2BAJwjnXZQQLiAQCJGx9PF5ywwE93nMu8nZrhgDtl/eiCsryM\n" +
+                "qjDfY5XyCgEAim9m50QU9I9gAzBgLeH2NSJhlHYZZ2LKsRE02tGvXQMACgkQXXEX\n" +
+                "HgWaHS806AD+KUmSoKja11wJqCMVhYSU2IMGdGYEwa7Dqpbhyzu/LtAA/jmF10Ss\n" +
+                "UPPI6jsYqxEHzRGex8t971atnDAjvDiS31YN\n" +
+                "=fTmB\n" +
+                "-----END PGP PRIVATE KEY BLOCK-----";
+        PGPSecretKeyRing secretKey = PGPainless.readKeyRing().secretKeyRing(pgpPrivateKeyBlock);
+
+        CachingSecretKeyRingProtector protector = SecretKeyRingProtector.defaultSecretKeyRingProtector(null);
+        // Add passphrases for subkeys via public key
+        protector.addPassphrase(secretKey.getPublicKey(),
+                Passphrase.fromPassword("pr1maryK3y"));
+        // or via subkey-id
+        protector.addPassphrase(3907509425258753406L,
+                Passphrase.fromPassword("f1rs7subk3y"));
+        // or via fingerprint
+        protector.addPassphrase(new OpenPgpV4Fingerprint("DD8E1195E4B1720E7FB10EF7F60402708E75D941"),
+                Passphrase.fromPassword("s3c0ndsubk3y"));
+
+
+        assertProtectorUnlocksAllSecretKeys(secretKey, protector);
+    }
+
+    private void assertProtectorUnlocksAllSecretKeys(PGPSecretKeyRing secretKey, SecretKeyRingProtector protector)
+            throws WrongPassphraseException {
+        for (PGPSecretKey key : secretKey) {
+            UnlockSecretKey.unlockSecretKey(key, protector);
+        }
+    }
+}