diff --git a/native/cpp/CommonCpp/CryptoTools/CryptoModule.cpp b/native/cpp/CommonCpp/CryptoTools/CryptoModule.cpp
index 329b3ea5d..c959f2176 100644
--- a/native/cpp/CommonCpp/CryptoTools/CryptoModule.cpp
+++ b/native/cpp/CommonCpp/CryptoTools/CryptoModule.cpp
@@ -1,451 +1,451 @@
 #include "CryptoModule.h"
 #include "Logger.h"
 #include "PlatformSpecificTools.h"
 #include "olm/account.hh"
 #include "olm/session.hh"
 
 #include <stdexcept>
 
 namespace comm {
 namespace crypto {
 
 CryptoModule::CryptoModule(std::string id) : id{id} {
   this->createAccount();
 }
 
 CryptoModule::CryptoModule(
     std::string id,
     std::string secretKey,
     Persist persist)
     : id{id} {
   if (persist.isEmpty()) {
     this->createAccount();
   } else {
     this->restoreFromB64(secretKey, persist);
   }
 }
 
 OlmAccount *CryptoModule::getOlmAccount() {
   return reinterpret_cast<OlmAccount *>(this->accountBuffer.data());
 }
 
 void CryptoModule::createAccount() {
   this->accountBuffer.resize(::olm_account_size());
   ::olm_account(this->accountBuffer.data());
 
   size_t randomSize = ::olm_create_account_random_length(this->getOlmAccount());
   OlmBuffer randomBuffer;
   PlatformSpecificTools::generateSecureRandomBytes(randomBuffer, randomSize);
 
   if (-1 ==
       ::olm_create_account(
           this->getOlmAccount(), randomBuffer.data(), randomSize)) {
     throw std::runtime_error{
         "error createAccount => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   };
 }
 
 void CryptoModule::exposePublicIdentityKeys() {
   size_t identityKeysSize =
       ::olm_account_identity_keys_length(this->getOlmAccount());
   if (this->keys.identityKeys.size() == identityKeysSize) {
     return;
   }
   this->keys.identityKeys.resize(
       ::olm_account_identity_keys_length(this->getOlmAccount()));
   if (-1 ==
       ::olm_account_identity_keys(
           this->getOlmAccount(),
           this->keys.identityKeys.data(),
           this->keys.identityKeys.size())) {
     throw std::runtime_error{
         "error generateIdentityKeys => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
 }
 
 void CryptoModule::generateOneTimeKeys(size_t oneTimeKeysAmount) {
   size_t oneTimeKeysSize = ::olm_account_generate_one_time_keys_random_length(
       this->getOlmAccount(), oneTimeKeysAmount);
   if (this->keys.oneTimeKeys.size() == oneTimeKeysSize) {
     return;
   }
   OlmBuffer random;
   PlatformSpecificTools::generateSecureRandomBytes(random, oneTimeKeysSize);
 
   if (-1 ==
       ::olm_account_generate_one_time_keys(
           this->getOlmAccount(),
           oneTimeKeysAmount,
           random.data(),
           random.size())) {
     throw std::runtime_error{
         "error generateOneTimeKeys => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
 }
 
 // returns number of published keys
 size_t CryptoModule::publishOneTimeKeys() {
   this->keys.oneTimeKeys.resize(
       ::olm_account_one_time_keys_length(this->getOlmAccount()));
   if (-1 ==
       ::olm_account_one_time_keys(
           this->getOlmAccount(),
           this->keys.oneTimeKeys.data(),
           this->keys.oneTimeKeys.size())) {
     throw std::runtime_error{
         "error publishOneTimeKeys => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
   return ::olm_account_mark_keys_as_published(this->getOlmAccount());
 }
 
 Keys CryptoModule::keysFromStrings(
     const std::string &identityKeys,
     const std::string &oneTimeKeys) {
   return {
       OlmBuffer(identityKeys.begin(), identityKeys.end()),
       OlmBuffer(oneTimeKeys.begin(), oneTimeKeys.end())};
 }
 
 std::string CryptoModule::getIdentityKeys() {
   this->exposePublicIdentityKeys();
   return std::string{
       this->keys.identityKeys.begin(), this->keys.identityKeys.end()};
 }
 
 std::string CryptoModule::getOneTimeKeys(size_t oneTimeKeysAmount) {
   this->generateOneTimeKeys(oneTimeKeysAmount);
   size_t publishedOneTimeKeys = this->publishOneTimeKeys();
   if (publishedOneTimeKeys != oneTimeKeysAmount) {
     throw std::runtime_error{
         "error generateKeys => invalid amount of one-time keys published. "
         "Expected " +
         std::to_string(oneTimeKeysAmount) + ", got " +
         std::to_string(publishedOneTimeKeys)};
   }
 
   return std::string{
       this->keys.oneTimeKeys.begin(), this->keys.oneTimeKeys.end()};
 }
 
 std::uint8_t CryptoModule::getNumPrekeys() {
   return reinterpret_cast<olm::Account *>(this->getOlmAccount())->num_prekeys;
 }
 
 std::string CryptoModule::getPrekey() {
   OlmBuffer prekey;
   prekey.resize(::olm_account_prekey_length(this->getOlmAccount()));
 
   if (-1 ==
       ::olm_account_prekey(
           this->getOlmAccount(), prekey.data(), prekey.size())) {
     throw std::runtime_error{
         "error getPrekey => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
 
   return std::string{std::string{prekey.begin(), prekey.end()}};
 }
 
 std::string CryptoModule::getPrekeySignature() {
   size_t signatureSize = ::olm_account_signature_length(this->getOlmAccount());
 
   OlmBuffer signatureBuffer;
   signatureBuffer.resize(signatureSize);
 
   if (-1 ==
       ::olm_account_prekey_signature(
           this->getOlmAccount(), signatureBuffer.data())) {
     throw std::runtime_error{
         "error getPrekeySignature => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
 
   return std::string{signatureBuffer.begin(), signatureBuffer.end()};
 }
 
 folly::Optional<std::string> CryptoModule::getUnpublishedPrekey() {
   OlmBuffer prekey;
   prekey.resize(::olm_account_prekey_length(this->getOlmAccount()));
 
   std::size_t retval = ::olm_account_unpublished_prekey(
       this->getOlmAccount(), prekey.data(), prekey.size());
 
   if (0 == retval) {
     return folly::none;
   } else if (-1 == retval) {
     throw std::runtime_error{
         "error getUnpublishedPrekey => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
 
   return std::string{prekey.begin(), prekey.end()};
 }
 
 std::string CryptoModule::generateAndGetPrekey() {
   size_t prekeySize =
       ::olm_account_generate_prekey_random_length(this->getOlmAccount());
 
   OlmBuffer random;
   PlatformSpecificTools::generateSecureRandomBytes(random, prekeySize);
 
   if (-1 ==
       ::olm_account_generate_prekey(
           this->getOlmAccount(), random.data(), random.size())) {
     throw std::runtime_error{
         "error generateAndGetPrekey => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
 
   OlmBuffer prekey;
   prekey.resize(::olm_account_prekey_length(this->getOlmAccount()));
 
   if (-1 ==
       ::olm_account_prekey(
           this->getOlmAccount(), prekey.data(), prekey.size())) {
     throw std::runtime_error{
         "error generateAndGetPrekey => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
 
   return std::string{prekey.begin(), prekey.end()};
 }
 
 void CryptoModule::markPrekeyAsPublished() {
   ::olm_account_mark_prekey_as_published(this->getOlmAccount());
 }
 
 void CryptoModule::forgetOldPrekey() {
   ::olm_account_forget_old_prekey(this->getOlmAccount());
 }
 
 void CryptoModule::initializeInboundForReceivingSession(
-    const std::string &targetUserId,
+    const std::string &targetDeviceId,
     const OlmBuffer &encryptedMessage,
     const OlmBuffer &idKeys,
     const bool overwrite) {
-  if (this->hasSessionFor(targetUserId)) {
+  if (this->hasSessionFor(targetDeviceId)) {
     if (overwrite) {
-      this->sessions.erase(this->sessions.find(targetUserId));
+      this->sessions.erase(this->sessions.find(targetDeviceId));
     } else {
       throw std::runtime_error{
           "error initializeInboundForReceivingSession => session already "
           "initialized"};
     }
   }
   std::unique_ptr<Session> newSession = Session::createSessionAsResponder(
       this->getOlmAccount(),
       this->keys.identityKeys.data(),
       encryptedMessage,
       idKeys);
-  this->sessions.insert(make_pair(targetUserId, std::move(newSession)));
+  this->sessions.insert(make_pair(targetDeviceId, std::move(newSession)));
 }
 
 void CryptoModule::initializeOutboundForSendingSession(
-    const std::string &targetUserId,
+    const std::string &targetDeviceId,
     const OlmBuffer &idKeys,
     const OlmBuffer &preKeys,
     const OlmBuffer &preKeySignature,
     const OlmBuffer &oneTimeKeys,
     size_t keyIndex) {
-  if (this->hasSessionFor(targetUserId)) {
+  if (this->hasSessionFor(targetDeviceId)) {
     Logger::log(
-        "olm session overwritten for the user with id: " + targetUserId);
-    this->sessions.erase(this->sessions.find(targetUserId));
+        "olm session overwritten for the device with id: " + targetDeviceId);
+    this->sessions.erase(this->sessions.find(targetDeviceId));
   }
   std::unique_ptr<Session> newSession = Session::createSessionAsInitializer(
       this->getOlmAccount(),
       this->keys.identityKeys.data(),
       idKeys,
       preKeys,
       preKeySignature,
       oneTimeKeys,
       keyIndex);
-  this->sessions.insert(make_pair(targetUserId, std::move(newSession)));
+  this->sessions.insert(make_pair(targetDeviceId, std::move(newSession)));
 }
 
-bool CryptoModule::hasSessionFor(const std::string &targetUserId) {
-  return (this->sessions.find(targetUserId) != this->sessions.end());
+bool CryptoModule::hasSessionFor(const std::string &targetDeviceId) {
+  return (this->sessions.find(targetDeviceId) != this->sessions.end());
 }
 
 std::shared_ptr<Session>
-CryptoModule::getSessionByUserId(const std::string &userId) {
-  return this->sessions.at(userId);
+CryptoModule::getSessionByDeviceId(const std::string &deviceId) {
+  return this->sessions.at(deviceId);
 }
 
 Persist CryptoModule::storeAsB64(const std::string &secretKey) {
   Persist persist;
   size_t accountPickleLength =
       ::olm_pickle_account_length(this->getOlmAccount());
   OlmBuffer accountPickleBuffer(accountPickleLength);
   if (accountPickleLength !=
       ::olm_pickle_account(
           this->getOlmAccount(),
           secretKey.data(),
           secretKey.size(),
           accountPickleBuffer.data(),
           accountPickleLength)) {
     throw std::runtime_error{
         "error storeAsB64 => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
   persist.account = accountPickleBuffer;
 
   std::unordered_map<std::string, std::shared_ptr<Session>>::iterator it;
   for (it = this->sessions.begin(); it != this->sessions.end(); ++it) {
     OlmBuffer buffer = it->second->storeAsB64(secretKey);
     persist.sessions.insert(make_pair(it->first, buffer));
   }
 
   return persist;
 }
 
 void CryptoModule::restoreFromB64(
     const std::string &secretKey,
     Persist persist) {
   this->accountBuffer.resize(::olm_account_size());
   ::olm_account(this->accountBuffer.data());
   if (-1 ==
       ::olm_unpickle_account(
           this->getOlmAccount(),
           secretKey.data(),
           secretKey.size(),
           persist.account.data(),
           persist.account.size())) {
     throw std::runtime_error{
         "error restoreFromB64 => " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
 
   std::unordered_map<std::string, OlmBuffer>::iterator it;
   for (it = persist.sessions.begin(); it != persist.sessions.end(); ++it) {
     std::unique_ptr<Session> session = session->restoreFromB64(
         this->getOlmAccount(),
         this->keys.identityKeys.data(),
         secretKey,
         it->second);
     this->sessions.insert(make_pair(it->first, move(session)));
   }
 }
 
 EncryptedData CryptoModule::encrypt(
-    const std::string &targetUserId,
+    const std::string &targetDeviceId,
     const std::string &content) {
-  if (!this->hasSessionFor(targetUserId)) {
+  if (!this->hasSessionFor(targetDeviceId)) {
     throw std::runtime_error{"error encrypt => uninitialized session"};
   }
-  OlmSession *session = this->sessions.at(targetUserId)->getOlmSession();
+  OlmSession *session = this->sessions.at(targetDeviceId)->getOlmSession();
   OlmBuffer encryptedMessage(
       ::olm_encrypt_message_length(session, content.size()));
   OlmBuffer messageRandom;
   PlatformSpecificTools::generateSecureRandomBytes(
       messageRandom, ::olm_encrypt_random_length(session));
   size_t messageType = ::olm_encrypt_message_type(session);
   if (-1 ==
       ::olm_encrypt(
           session,
           (uint8_t *)content.data(),
           content.size(),
           messageRandom.data(),
           messageRandom.size(),
           encryptedMessage.data(),
           encryptedMessage.size())) {
     throw std::runtime_error{
         "error encrypt => " + std::string{::olm_session_last_error(session)}};
   }
   return {encryptedMessage, messageType};
 }
 
 std::string CryptoModule::decrypt(
-    const std::string &targetUserId,
+    const std::string &targetDeviceId,
     EncryptedData &encryptedData) {
-  if (!this->hasSessionFor(targetUserId)) {
+  if (!this->hasSessionFor(targetDeviceId)) {
     throw std::runtime_error{"error decrypt => uninitialized session"};
   }
-  OlmSession *session = this->sessions.at(targetUserId)->getOlmSession();
+  OlmSession *session = this->sessions.at(targetDeviceId)->getOlmSession();
 
   OlmBuffer utilityBuffer(::olm_utility_size());
   OlmUtility *olmUtility = ::olm_utility(utilityBuffer.data());
 
   OlmBuffer messageHashBuffer(::olm_sha256_length(olmUtility));
   ::olm_sha256(
       olmUtility,
       encryptedData.message.data(),
       encryptedData.message.size(),
       messageHashBuffer.data(),
       messageHashBuffer.size());
 
   OlmBuffer tmpEncryptedMessage(encryptedData.message);
   size_t maxSize = ::olm_decrypt_max_plaintext_length(
       session,
       encryptedData.messageType,
       tmpEncryptedMessage.data(),
       tmpEncryptedMessage.size());
 
   if (maxSize == -1) {
     throw std::runtime_error{
         "error decrypt_max_plaintext_length => " +
         std::string{::olm_session_last_error(session)} + ". Hash: " +
         std::string{messageHashBuffer.begin(), messageHashBuffer.end()}};
   }
 
   OlmBuffer decryptedMessage(maxSize);
   size_t decryptedSize = ::olm_decrypt(
       session,
       encryptedData.messageType,
       encryptedData.message.data(),
       encryptedData.message.size(),
       decryptedMessage.data(),
       decryptedMessage.size());
   if (decryptedSize == -1) {
     throw std::runtime_error{
         "error decrypt => " + std::string{::olm_session_last_error(session)} +
         ". Hash: " +
         std::string{messageHashBuffer.begin(), messageHashBuffer.end()}};
   }
   return std::string{(char *)decryptedMessage.data(), decryptedSize};
 }
 
 std::string CryptoModule::signMessage(const std::string &message) {
   OlmBuffer signature;
   signature.resize(::olm_account_signature_length(this->getOlmAccount()));
   size_t signatureLength = ::olm_account_sign(
       this->getOlmAccount(),
       (uint8_t *)message.data(),
       message.length(),
       signature.data(),
       signature.size());
   if (signatureLength == -1) {
     throw std::runtime_error{
         "olm error: " +
         std::string{::olm_account_last_error(this->getOlmAccount())}};
   }
   return std::string{(char *)signature.data(), signatureLength};
 }
 
 void CryptoModule::verifySignature(
     const std::string &publicKey,
     const std::string &message,
     const std::string &signature) {
   OlmBuffer utilityBuffer;
   utilityBuffer.resize(::olm_utility_size());
   OlmUtility *olmUtility = ::olm_utility(utilityBuffer.data());
   ssize_t verificationResult = ::olm_ed25519_verify(
       olmUtility,
       (uint8_t *)publicKey.data(),
       publicKey.length(),
       (uint8_t *)message.data(),
       message.length(),
       (uint8_t *)signature.data(),
       signature.length());
   if (verificationResult == -1) {
     throw std::runtime_error{
         "olm error: " + std::string{::olm_utility_last_error(olmUtility)}};
   }
 }
 
 } // namespace crypto
 } // namespace comm
diff --git a/native/cpp/CommonCpp/CryptoTools/CryptoModule.h b/native/cpp/CommonCpp/CryptoTools/CryptoModule.h
index 6319c123d..a5ecbe2a6 100644
--- a/native/cpp/CommonCpp/CryptoTools/CryptoModule.h
+++ b/native/cpp/CommonCpp/CryptoTools/CryptoModule.h
@@ -1,88 +1,88 @@
 #pragma once
 
 #include <memory>
 #include <string>
 #include <unordered_map>
 
 #include "folly/Optional.h"
 #include "olm/olm.h"
 
 #include "Persist.h"
 #include "Session.h"
 #include "Tools.h"
 
 namespace comm {
 namespace crypto {
 
 class CryptoModule {
 
   OlmBuffer accountBuffer;
 
   std::unordered_map<std::string, std::shared_ptr<Session>> sessions = {};
 
   Keys keys;
 
   OlmAccount *getOlmAccount();
   void createAccount();
   void exposePublicIdentityKeys();
   void generateOneTimeKeys(size_t oneTimeKeysAmount);
   // returns number of published keys
   size_t publishOneTimeKeys();
 
 public:
   const std::string id;
   CryptoModule(std::string id);
   CryptoModule(std::string id, std::string secretKey, Persist persist);
 
   // CryptoModule's accountBuffer cannot be safely copied
   // See explanation in https://phab.comm.dev/D9562
   CryptoModule(const CryptoModule &) = delete;
 
   static Keys keysFromStrings(
       const std::string &identityKeys,
       const std::string &oneTimeKeys);
 
   std::string getIdentityKeys();
   std::string getOneTimeKeys(size_t oneTimeKeysAmount = 50);
 
   // Prekey rotation methods for X3DH
   std::uint8_t getNumPrekeys();
   std::string getPrekey();
   std::string getPrekeySignature();
   folly::Optional<std::string> getUnpublishedPrekey();
   std::string generateAndGetPrekey();
   void markPrekeyAsPublished();
   void forgetOldPrekey();
 
   void initializeInboundForReceivingSession(
-      const std::string &targetUserId,
+      const std::string &targetDeviceId,
       const OlmBuffer &encryptedMessage,
       const OlmBuffer &idKeys,
       const bool overwrite = false);
   void initializeOutboundForSendingSession(
-      const std::string &targetUserId,
+      const std::string &targetDeviceId,
       const OlmBuffer &idKeys,
       const OlmBuffer &preKeys,
       const OlmBuffer &preKeySignature,
       const OlmBuffer &oneTimeKeys,
       size_t keyIndex = 0);
-  bool hasSessionFor(const std::string &targetUserId);
-  std::shared_ptr<Session> getSessionByUserId(const std::string &userId);
+  bool hasSessionFor(const std::string &targetDeviceId);
+  std::shared_ptr<Session> getSessionByDeviceId(const std::string &deviceId);
 
   Persist storeAsB64(const std::string &secretKey);
   void restoreFromB64(const std::string &secretKey, Persist persist);
 
   EncryptedData
-  encrypt(const std::string &targetUserId, const std::string &content);
+  encrypt(const std::string &targetDeviceId, const std::string &content);
   std::string
-  decrypt(const std::string &targetUserId, EncryptedData &encryptedData);
+  decrypt(const std::string &targetDeviceId, EncryptedData &encryptedData);
 
   std::string signMessage(const std::string &message);
   static void verifySignature(
       const std::string &publicKey,
       const std::string &message,
       const std::string &signature);
 };
 
 } // namespace crypto
 } // namespace comm