diff --git a/CMakeLists.txt b/CMakeLists.txt
index 954657936..c76064e28 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -425,6 +425,7 @@ set(TDLIB_SOURCE
   td/telegram/Global.cpp
   td/telegram/HashtagHints.cpp
   td/telegram/InlineQueriesManager.cpp
+  td/telegram/InputDialogId.cpp
   td/telegram/InputMessageText.cpp
   td/telegram/JsonValue.cpp
   td/telegram/LanguagePackManager.cpp
@@ -588,6 +589,7 @@ set(TDLIB_SOURCE
   td/telegram/Global.h
   td/telegram/HashtagHints.h
   td/telegram/InlineQueriesManager.h
+  td/telegram/InputDialogId.h
   td/telegram/InputMessageText.h
   td/telegram/JsonValue.h
   td/telegram/LanguagePackManager.h
diff --git a/td/telegram/DialogId.cpp b/td/telegram/DialogId.cpp
index 6fc4646e0..39d160336 100644
--- a/td/telegram/DialogId.cpp
+++ b/td/telegram/DialogId.cpp
@@ -14,18 +14,14 @@ namespace td {
 
 bool DialogId::is_valid() const {
   switch (get_type()) {
-    case DialogType::User: {
+    case DialogType::User:
       return get_user_id().is_valid();
-    }
-    case DialogType::Chat: {
+    case DialogType::Chat:
       return get_chat_id().is_valid();
-    }
-    case DialogType::Channel: {
+    case DialogType::Channel:
       return get_channel_id().is_valid();
-    }
-    case DialogType::SecretChat: {
+    case DialogType::SecretChat:
       return get_secret_chat_id().is_valid();
-    }
     case DialogType::None:
       return false;
     default:
diff --git a/td/telegram/DialogId.h b/td/telegram/DialogId.h
index 898824377..ce2abde86 100644
--- a/td/telegram/DialogId.h
+++ b/td/telegram/DialogId.h
@@ -37,7 +37,6 @@ class DialogId {
   static int64 get_peer_id(const tl_object_ptr<telegram_api::Peer> &peer);
 
  public:
-  using UnderlyingType = decltype(id);
   DialogId() = default;
 
   explicit DialogId(int64 dialog_id) : id(dialog_id) {
diff --git a/td/telegram/InputDialogId.cpp b/td/telegram/InputDialogId.cpp
new file mode 100644
index 000000000..93b7ec15d
--- /dev/null
+++ b/td/telegram/InputDialogId.cpp
@@ -0,0 +1,80 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#include "td/telegram/InputDialogId.h"
+
+#include "td/utils/logging.h"
+
+namespace td {
+
+InputDialogId::InputDialogId(const tl_object_ptr<telegram_api::InputPeer> &input_peer) {
+  CHECK(input_peer != nullptr);
+  switch (input_peer->get_id()) {
+    case telegram_api::inputPeerUser::ID: {
+      auto input_user = static_cast<const telegram_api::inputPeerUser *>(input_peer.get());
+      UserId user_id(input_user->user_id_);
+      if (user_id.is_valid()) {
+        dialog_id = DialogId(user_id);
+        access_hash = input_user->access_hash_;
+        return;
+      }
+      break;
+    }
+    case telegram_api::inputPeerChat::ID: {
+      auto input_chat = static_cast<const telegram_api::inputPeerChat *>(input_peer.get());
+      ChatId chat_id(input_chat->chat_id_);
+      if (chat_id.is_valid()) {
+        dialog_id = DialogId(chat_id);
+        return;
+      }
+      break;
+    }
+    case telegram_api::inputPeerChannel::ID: {
+      auto input_channel = static_cast<const telegram_api::inputPeerChannel *>(input_peer.get());
+      ChannelId channel_id(input_channel->channel_id_);
+      if (channel_id.is_valid()) {
+        dialog_id = DialogId(channel_id);
+        access_hash = input_channel->access_hash_;
+        return;
+      }
+      break;
+    }
+    default:
+      break;
+  }
+  LOG(ERROR) << "Receive " << to_string(input_peer);
+}
+
+vector<InputDialogId> InputDialogId::get_input_dialog_ids(const vector<tl_object_ptr<telegram_api::InputPeer>> &input_peers) {
+  vector<InputDialogId> result;
+  result.reserve(input_peers.size());
+  for (auto &input_peer:input_peers) {
+    InputDialogId input_dialog_id(input_peer);
+    if (input_dialog_id.is_valid()) {
+      result.push_back(input_dialog_id);
+    }
+  }
+  return result;
+}
+
+tl_object_ptr<telegram_api::InputPeer> InputDialogId::get_input_peer() const {
+  switch (dialog_id.get_type()) {
+    case DialogType::User:
+      return make_tl_object<telegram_api::inputPeerUser>(dialog_id.get_user_id().get(), access_hash);
+    case DialogType::Chat:
+      return make_tl_object<telegram_api::inputPeerChat>(dialog_id.get_chat_id().get());
+    case DialogType::Channel:
+      return make_tl_object<telegram_api::inputPeerChannel>(dialog_id.get_channel_id().get(), access_hash);
+    case DialogType::SecretChat:
+    case DialogType::None:
+      return nullptr;
+    default:
+      UNREACHABLE();
+      return false;
+  }
+}
+
+}  // namespace td
diff --git a/td/telegram/InputDialogId.h b/td/telegram/InputDialogId.h
new file mode 100644
index 000000000..6069bc404
--- /dev/null
+++ b/td/telegram/InputDialogId.h
@@ -0,0 +1,67 @@
+//
+// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2020
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+#pragma once
+
+#include "td/telegram/DialogId.h"
+#include "td/telegram/telegram_api.h"
+
+#include "td/utils/common.h"
+#include "td/utils/StringBuilder.h"
+
+namespace td {
+
+class InputDialogId {
+  DialogId dialog_id;
+  int64 access_hash = 0;
+
+ public:
+  InputDialogId() = default;
+
+  explicit InputDialogId(DialogId dialog_id): dialog_id(dialog_id) {
+    CHECK(dialog_id.get_type() == DialogType::SecretChat);
+  }
+
+  explicit InputDialogId(const tl_object_ptr<telegram_api::InputPeer> &input_peer);
+
+  static vector<InputDialogId> get_input_dialog_ids(const vector<tl_object_ptr<telegram_api::InputPeer>> &input_peers);
+
+  bool operator==(const InputDialogId &other) const {
+    return dialog_id == other.dialog_id && access_hash == other.access_hash;
+  }
+
+  bool operator!=(const InputDialogId &other) const {
+    return !(*this == other);
+  }
+
+  bool is_valid() const {
+    return dialog_id.is_valid();
+  }
+
+  DialogId get_dialog_id() const {
+    return dialog_id;
+  }
+
+  tl_object_ptr<telegram_api::InputPeer> get_input_peer() const;
+
+  template <class StorerT>
+  void store(StorerT &storer) const {
+    dialog_id.store(storer);
+    storer.store_long(access_hash);
+  }
+
+  template <class ParserT>
+  void parse(ParserT &parser) {
+    dialog_id.parse(parser);
+    access_hash = parser.fetch_long();
+  }
+};
+
+inline StringBuilder &operator<<(StringBuilder &string_builder, InputDialogId input_dialog_id) {
+  return string_builder << "input " << input_dialog_id.get_dialog_id();
+}
+
+}  // namespace td
diff --git a/td/telegram/MessagesManager.h b/td/telegram/MessagesManager.h
index 13fc04e1a..fbd326e6c 100644
--- a/td/telegram/MessagesManager.h
+++ b/td/telegram/MessagesManager.h
@@ -26,6 +26,7 @@
 #include "td/telegram/FolderId.h"
 #include "td/telegram/FullMessageId.h"
 #include "td/telegram/Global.h"
+#include "td/telegram/InputDialogId.h"
 #include "td/telegram/MessageContentType.h"
 #include "td/telegram/MessageId.h"
 #include "td/telegram/MessagesDb.h"