diff --git a/keychain-kit.xcodeproj/project.pbxproj b/keychain-kit.xcodeproj/project.pbxproj
index 9a70958..4c558d0 100644
--- a/keychain-kit.xcodeproj/project.pbxproj
+++ b/keychain-kit.xcodeproj/project.pbxproj
@@ -302,7 +302,7 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.1.1;
+				MARKETING_VERSION = 1.1.2;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.mr-noone.keychain-kit";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -327,7 +327,7 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 1.1.1;
+				MARKETING_VERSION = 1.1.2;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.mr-noone.keychain-kit";
 				SKIP_INSTALL = YES;
 				SWIFT_VERSION = 5.0;
diff --git a/keychain-kit/Sources/Keychain.swift b/keychain-kit/Sources/Keychain.swift
index 4b2038b..5df6fea 100644
--- a/keychain-kit/Sources/Keychain.swift
+++ b/keychain-kit/Sources/Keychain.swift
@@ -8,7 +8,21 @@
 
 import Foundation
 
-public struct Keychain {
+public protocol KeychainProtocol {
+  func get(_ key: String) throws -> Data
+  func get(_ key: String) throws -> String
+  func get(_ key: String) throws -> UUID
+  func get<T>(_ key: String, decoder: JSONDecoder) throws -> T where T: Decodable
+  
+  func set(_ data: Data, for key: String) throws
+  func set(_ value: String, for key: String) throws
+  func set(_ uuid: UUID, for key: String) throws
+  func set<T>(_ value: T, for key: String, encoder: JSONEncoder) throws where T: Encodable
+  
+  func delete(_ key: String) throws
+}
+
+public struct Keychain: KeychainProtocol {
   public enum Error: Swift.Error {
     case noData
     case unexpectedData