diff --git a/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinator.swift b/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinator.swift
new file mode 100644
index 000000000..05d5f1d4c
--- /dev/null
+++ b/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinator.swift
@@ -0,0 +1,107 @@
+// File created from FlowTemplate
+// $ createRootCoordinator.sh CrossSigning CrossSigningSetup
+/*
+ Copyright 2021 New Vector Ltd
+ 
+ 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.
+ */
+
+import UIKit
+
+@objcMembers
+final class CrossSigningSetupCoordinator: CrossSigningSetupCoordinatorType {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let parameters: CrossSigningSetupCoordinatorParameters
+    private let crossSigningService: CrossSigningService
+    
+    // MARK: Public
+
+    // Must be used only internally
+    var childCoordinators: [Coordinator] = []
+    
+    weak var delegate: CrossSigningSetupCoordinatorDelegate?
+    
+    // MARK: - Setup
+    
+    init(parameters: CrossSigningSetupCoordinatorParameters) {
+        self.parameters = parameters
+        self.crossSigningService = CrossSigningService()
+    }    
+    
+    // MARK: - Public methods
+    
+    func start() {
+        self.showReauthentication()
+    }
+    
+    func toPresentable() -> UIViewController {
+        return self.parameters.presenter.toPresentable()
+    }
+    
+    // MARK: - Private methods
+
+    private func showReauthentication() {
+        
+        let authenticationSessionParameters = self.crossSigningService.setupCrossSigningAuthenticationSessionParameters()
+        
+        let reauthenticationParameters = ReauthenticationCoordinatorParameters(session: parameters.session,
+                                                                               presenter: parameters.presenter,
+                                                                               title: parameters.title,
+                                                                               message: parameters.message,
+                                                                               authenticationSessionParameters: authenticationSessionParameters)
+        
+        let coordinator = ReauthenticationCoordinator(parameters: reauthenticationParameters)
+        coordinator.delegate = self
+        self.add(childCoordinator: coordinator)
+        
+        coordinator.start()
+    }
+    
+    private func setupCrossSigning(with authenticationParameters: [String: Any]) {
+        guard let crossSigning = self.parameters.session.crypto.crossSigning else {
+            return
+        }
+        
+        crossSigning.setup(withAuthParams: authenticationParameters) { [weak self] in
+            guard let self = self else {
+                return
+            }
+            self.delegate?.crossSigningSetupCoordinatorDidComplete(self)
+        } failure: { [weak self] error in
+            guard let self = self else {
+                return
+            }
+            self.delegate?.crossSigningSetupCoordinator(self, didFailWithError: error)
+        }
+    }
+}
+
+// MARK: - ReauthenticationCoordinatorDelegate
+extension CrossSigningSetupCoordinator: ReauthenticationCoordinatorDelegate {
+        
+    func reauthenticationCoordinatorDidComplete(_ coordinator: ReauthenticationCoordinatorType, withAuthenticationParameters authenticationParameters: [String: Any]?) {
+        self.setupCrossSigning(with: authenticationParameters ?? [:])
+    }
+    
+    func reauthenticationCoordinatorDidCancel(_ coordinator: ReauthenticationCoordinatorType) {
+        self.delegate?.crossSigningSetupCoordinatorDidCancel(self)
+    }
+    
+    func reauthenticationCoordinator(_ coordinator: ReauthenticationCoordinatorType, didFailWithError error: Error) {
+        self.delegate?.crossSigningSetupCoordinator(self, didFailWithError: error)
+    }
+}
diff --git a/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorBridgePresenter.swift b/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorBridgePresenter.swift
new file mode 100644
index 000000000..b334c9c40
--- /dev/null
+++ b/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorBridgePresenter.swift
@@ -0,0 +1,105 @@
+// File created from FlowTemplate
+// $ createRootCoordinator.sh CrossSigning CrossSigningSetup
+/*
+ Copyright 2021 New Vector Ltd
+ 
+ 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.
+ */
+
+import Foundation
+
+/// CrossSigningSetupCoordinatorBridgePresenter enables to start CrossSigningSetupCoordinator from a view controller.
+/// This bridge is used while waiting for global usage of coordinator pattern.
+/// It breaks the Coordinator abstraction and it has been introduced for Objective-C compatibility (mainly for integration in legacy view controllers).
+/// Each bridge should be removed once the underlying Coordinator has been integrated by another Coordinator.
+@objcMembers
+final class CrossSigningSetupCoordinatorBridgePresenter: NSObject {
+    
+    // MARK: - Properties
+    
+    // MARK: Private
+    
+    private let session: MXSession
+    private var coordinator: CrossSigningSetupCoordinator?
+    
+    private var didComplete: (() -> Void)?
+    private var didCancel: (() -> Void)?
+    private var didFail: ((Error) -> Void)?        
+        
+    // MARK: - Setup
+    
+    init(session: MXSession) {
+        self.session = session
+        super.init()
+    }
+    
+    // MARK: - Public
+    
+    func present(with title: String,
+                 message: String,
+                 from viewController: UIViewController,
+                 animated: Bool,
+                 success: @escaping () -> Void,
+                 cancel: @escaping () -> Void,
+                 failure: @escaping (Error) -> Void) {
+        
+        self.didComplete = success
+        self.didCancel = cancel
+        self.didFail = failure
+        
+        let parameters = CrossSigningSetupCoordinatorParameters(session: self.session, presenter: viewController, title: title, message: message)
+        
+        let crossSigningSetupCoordinator = CrossSigningSetupCoordinator(parameters: parameters)
+        crossSigningSetupCoordinator.delegate = self
+        crossSigningSetupCoordinator.start()
+        
+        self.coordinator = crossSigningSetupCoordinator
+    }
+    
+    func dismiss(animated: Bool, completion: (() -> Void)?) {
+        
+        self.resetCompletions()
+        
+        guard let coordinator = self.coordinator else {
+            return
+        }
+        coordinator.toPresentable().dismiss(animated: animated) {
+            self.coordinator = nil
+
+            if let completion = completion {
+                completion()
+            }
+        }
+    }
+    
+    private func resetCompletions() {
+        self.didComplete = nil
+        self.didCancel = nil
+        self.didFail = nil
+    }
+}
+
+// MARK: - CrossSigningSetupCoordinatorDelegate
+extension CrossSigningSetupCoordinatorBridgePresenter: CrossSigningSetupCoordinatorDelegate {
+    func crossSigningSetupCoordinatorDidComplete(_ coordinator: CrossSigningSetupCoordinatorType) {
+        self.didComplete?()
+    }
+    
+    func crossSigningSetupCoordinatorDidCancel(_ coordinator: CrossSigningSetupCoordinatorType) {
+        self.didCancel?()
+    }
+    
+    func crossSigningSetupCoordinator(_ coordinator: CrossSigningSetupCoordinatorType, didFailWithError error: Error) {
+        self.didFail?(error)
+    }
+}
diff --git a/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorParameters.swift b/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorParameters.swift
new file mode 100644
index 000000000..65b50f2d9
--- /dev/null
+++ b/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorParameters.swift
@@ -0,0 +1,46 @@
+// 
+// Copyright 2020 New Vector Ltd
+//
+// 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.
+//
+
+import Foundation
+
+/// CrossSigningSetupCoordinator input parameters
+@objcMembers
+class CrossSigningSetupCoordinatorParameters: NSObject {
+    
+    /// The Matrix session
+    let session: MXSession
+    
+    /// The presenter used to show authentication screen(s)
+    let presenter: Presentable
+    
+    /// The title to use in the authentication screen if present.
+    let title: String?
+    
+    /// The message to use in the authentication screen if present.
+    let message: String?
+    
+    init(session: MXSession,
+         presenter: Presentable,
+         title: String?,
+         message: String?) {
+        self.session = session
+        self.presenter = presenter
+        self.title = title
+        self.message = message
+        
+        super.init()
+    }
+}
diff --git a/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorType.swift b/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorType.swift
new file mode 100644
index 000000000..1dc620d3f
--- /dev/null
+++ b/Riot/Modules/CrossSigning/Setup/CrossSigningSetupCoordinatorType.swift
@@ -0,0 +1,30 @@
+// File created from FlowTemplate
+// $ createRootCoordinator.sh CrossSigning CrossSigningSetup
+/*
+ Copyright 2020 New Vector Ltd
+ 
+ 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.
+ */
+
+import Foundation
+
+protocol CrossSigningSetupCoordinatorDelegate: class {
+    func crossSigningSetupCoordinatorDidComplete(_ coordinator: CrossSigningSetupCoordinatorType)
+    func crossSigningSetupCoordinatorDidCancel(_ coordinator: CrossSigningSetupCoordinatorType)
+    func crossSigningSetupCoordinator(_ coordinator: CrossSigningSetupCoordinatorType, didFailWithError error: Error)
+}
+
+/// `CrossSigningSetupCoordinatorType` is a protocol describing a Coordinator that handles cross signing setup navigation flow.
+protocol CrossSigningSetupCoordinatorType: Coordinator, Presentable {
+    var delegate: CrossSigningSetupCoordinatorDelegate? { get }
+}