diff --git a/src/main/java/org/pgpainless/pgpainless/key/collection/KeyRingCollection.java b/src/main/java/org/pgpainless/pgpainless/key/collection/KeyRingCollection.java
new file mode 100644
index 00000000..c3f914a0
--- /dev/null
+++ b/src/main/java/org/pgpainless/pgpainless/key/collection/KeyRingCollection.java
@@ -0,0 +1,70 @@
+/*
+ * Copyright 2018 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.pgpainless.key.collection;
+
+import java.util.Objects;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.bouncycastle.openpgp.PGPPublicKeyRing;
+import org.bouncycastle.openpgp.PGPPublicKeyRingCollection;
+import org.bouncycastle.openpgp.PGPSecretKeyRing;
+import org.bouncycastle.openpgp.PGPSecretKeyRingCollection;
+
+public class KeyRingCollection {
+
+    private static final Logger LOGGER = Logger.getLogger(KeyRingCollection.class.getName());
+
+    private PGPPublicKeyRingCollection publicKeys;
+    private PGPSecretKeyRingCollection secretKeys;
+
+    public KeyRingCollection(PGPPublicKeyRingCollection publicKeyRings, PGPSecretKeyRingCollection secretKeyRings) {
+        this.publicKeys = publicKeyRings;
+        this.secretKeys = secretKeyRings;
+    }
+
+    public KeyRingCollection(PGPPublicKeyRingCollection publicKeyRings) {
+        this(publicKeyRings, null);
+    }
+
+    public KeyRingCollection(PGPSecretKeyRingCollection secretKeyRings) {
+        this(null, secretKeyRings);
+    }
+
+    public void importPublicKeys(PGPPublicKeyRingCollection publicKeyRings) {
+        for (PGPPublicKeyRing keyRing : Objects.requireNonNull(publicKeyRings)) {
+            try {
+                this.publicKeys = PGPPublicKeyRingCollection.addPublicKeyRing(this.publicKeys, keyRing);
+            } catch (IllegalArgumentException e) {
+                // TODO: merge key rings.
+                LOGGER.log(Level.FINE, "Keyring " + Long.toHexString(keyRing.getPublicKey().getKeyID()) +
+                        " is already included in the collection. Skip!");
+            }
+        }
+    }
+
+    public void importSecretKeys(PGPSecretKeyRingCollection secretKeyRings) {
+        for (PGPSecretKeyRing keyRing : Objects.requireNonNull(secretKeyRings)) {
+            try {
+                this.secretKeys = PGPSecretKeyRingCollection.addSecretKeyRing(this.secretKeys, keyRing);
+            } catch (IllegalArgumentException e) {
+                // TODO: merge key rings.
+                LOGGER.log(Level.FINE, "Keyring " + Long.toHexString(keyRing.getPublicKey().getKeyID()) +
+                        " is already included in the collection. Skip!");
+            }
+        }
+    }
+}
diff --git a/src/main/java/org/pgpainless/pgpainless/key/collection/package-info.java b/src/main/java/org/pgpainless/pgpainless/key/collection/package-info.java
new file mode 100644
index 00000000..f6db8780
--- /dev/null
+++ b/src/main/java/org/pgpainless/pgpainless/key/collection/package-info.java
@@ -0,0 +1,19 @@
+/*
+ * Copyright 2018 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.
+ */
+/**
+ * OpenPGP key collections.
+ */
+package org.pgpainless.pgpainless.key.collection;