diff --git a/scm-core/src/main/java/sonia/scm/security/GPGPublicKey.java b/scm-core/src/main/java/sonia/scm/security/GPGPublicKey.java
new file mode 100644
index 0000000000..731b958c09
--- /dev/null
+++ b/scm-core/src/main/java/sonia/scm/security/GPGPublicKey.java
@@ -0,0 +1,40 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.security;
+
+import lombok.Value;
+
+/**
+ * Public gpg key.
+ * @since 2.3.0
+ */
+@Value
+public class GPGPublicKey {
+
+  private final String id;
+  private final String owner;
+  private final String raw;
+
+}
diff --git a/scm-core/src/main/java/sonia/scm/security/GPGPublicKeyResolver.java b/scm-core/src/main/java/sonia/scm/security/GPGPublicKeyResolver.java
new file mode 100644
index 0000000000..56158ec36a
--- /dev/null
+++ b/scm-core/src/main/java/sonia/scm/security/GPGPublicKeyResolver.java
@@ -0,0 +1,48 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020-present Cloudogu GmbH and Contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package sonia.scm.security;
+
+import java.util.List;
+import java.util.Optional;
+
+/**
+ * Resolver for public gpg keys.
+ * @since 2.3.0
+ */
+public interface GPGPublicKeyResolver {
+
+  /**
+   * Resolves the public key by its id.
+   * @param keyId id of the key
+   * @return public gpg key or empty optional.
+   */
+  Optional<GPGPublicKey> byId(String keyId);
+
+  /**
+   * Resolves all public gpg keys for the given user.
+   * @return list of public gpg keys
+   */
+  List<GPGPublicKey> byUser(String username);
+}