diff --git a/keyserver/src/endpoints.js b/keyserver/src/endpoints.js
--- a/keyserver/src/endpoints.js
+++ b/keyserver/src/endpoints.js
@@ -18,7 +18,10 @@
   calendarQueryUpdateResponder,
 } from './responders/entry-responders.js';
 import type { JSONResponder } from './responders/handlers.js';
-import { getSessionPublicKeysResponder } from './responders/keys-responders.js';
+import {
+  getSessionPublicKeysResponder,
+  getOlmNotifsSessionInitializationDataResponder,
+} from './responders/keys-responders.js';
 import { messageReportCreationResponder } from './responders/message-report-responder.js';
 import {
   textMessageCreationResponder,
@@ -262,6 +265,10 @@
     responder: updateUserAvatarResponder,
     requiredPolicies: baseLegalPolicies,
   },
+  get_olm_notifs_session_initialization_data: {
+    responder: getOlmNotifsSessionInitializationDataResponder,
+    requiredPolicies: [],
+  },
 };
 
 export { jsonEndpoints };
diff --git a/keyserver/src/responders/keys-responders.js b/keyserver/src/responders/keys-responders.js
--- a/keyserver/src/responders/keys-responders.js
+++ b/keyserver/src/responders/keys-responders.js
@@ -1,13 +1,21 @@
 // @flow
 
+import type { Account as OlmAccount } from '@commapp/olm';
 import t from 'tcomb';
 
-import type { GetSessionPublicKeysArgs } from 'lib/types/request-types.js';
+import type {
+  GetOlmNotifsSessionInitializationDataResponse,
+  GetOlmNotifsSessionInitializationDataRequest,
+  GetSessionPublicKeysArgs,
+} from 'lib/types/request-types.js';
 import type { SessionPublicKeys } from 'lib/types/session-types.js';
+import { ServerError } from 'lib/utils/errors.js';
 import { tShape } from 'lib/utils/validation-utils.js';
 
 import { fetchSessionPublicKeys } from '../fetchers/key-fetchers.js';
 import type { Viewer } from '../session/viewer.js';
+import { fetchCallUpdateOlmAccount } from '../updaters/olm-account-updater.js';
+import { validateAccountPrekey } from '../utils/olm-utils.js';
 import { validateInput } from '../utils/validation-utils.js';
 
 const getSessionPublicKeysInputValidator = tShape({
@@ -26,4 +34,74 @@
   return await fetchSessionPublicKeys(request.session);
 }
 
-export { getSessionPublicKeysResponder };
+const getOlmNotifsSessionInitializationDataRequestInputValidator = tShape({
+  oneTimeKeysCount: t.Number,
+});
+
+async function getOlmNotifsSessionInitializationDataResponder(
+  viewer: Viewer,
+  input: any,
+): Promise<GetOlmNotifsSessionInitializationDataResponse> {
+  await validateInput(
+    viewer,
+    getOlmNotifsSessionInitializationDataRequestInputValidator,
+    input,
+  );
+  const request: GetOlmNotifsSessionInitializationDataRequest = input;
+
+  let prekey, notificationsIdentityKeysString, oneTimeKeys;
+  const notificationsAccountCallback = async (account: OlmAccount) => {
+    notificationsIdentityKeysString = account.identity_keys();
+
+    await validateAccountPrekey(account);
+    prekey = account.prekey();
+    // Until transfer of prekeys to the identity service is not implemented
+    // notifs prekey will be marked as published each time it is accessed
+    // to establish olm notifs session to mitigate the risk of notifs
+    // prekey being in use long enough to cause security concerns
+    account.mark_prekey_as_published();
+
+    account.generate_one_time_keys(request.oneTimeKeysCount);
+    oneTimeKeys = account.one_time_keys();
+    account.mark_keys_as_published();
+  };
+
+  await fetchCallUpdateOlmAccount(
+    'notifications',
+    notificationsAccountCallback,
+  );
+  if (!prekey || !oneTimeKeys) {
+    throw new ServerError('olm_account_query_failure');
+  }
+
+  let identityKeysBlob, identityKeysBlobPayload, signedIdentityKeysBlob;
+  const primaryAccountCallback = async (account: OlmAccount) => {
+    identityKeysBlob = {
+      primaryIdentityPublicKeys: JSON.parse(account.identity_keys()),
+      notificationIdentityPublicKeys: JSON.parse(
+        notificationsIdentityKeysString,
+      ),
+    };
+    identityKeysBlobPayload = JSON.stringify(identityKeysBlob);
+    signedIdentityKeysBlob = {
+      payload: identityKeysBlobPayload,
+      signature: account.sign(identityKeysBlobPayload),
+    };
+  };
+
+  await fetchCallUpdateOlmAccount('primary', primaryAccountCallback);
+  if (!signedIdentityKeysBlob) {
+    throw new ServerError('olm_account_query_failure');
+  }
+
+  return {
+    signedIdentityKeysBlob,
+    prekey,
+    oneTimeKeys,
+  };
+}
+
+export {
+  getSessionPublicKeysResponder,
+  getOlmNotifsSessionInitializationDataResponder,
+};
diff --git a/lib/actions/user-actions.js b/lib/actions/user-actions.js
--- a/lib/actions/user-actions.js
+++ b/lib/actions/user-actions.js
@@ -14,7 +14,11 @@
   ClientAvatar,
   UpdateUserAvatarRequest,
 } from '../types/avatar-types.js';
-import type { GetSessionPublicKeysArgs } from '../types/request-types.js';
+import type {
+  GetSessionPublicKeysArgs,
+  GetOlmNotifsSessionInitializationDataRequest,
+  GetOlmNotifsSessionInitializationDataResponse,
+} from '../types/request-types.js';
 import type { UserSearchResult } from '../types/search-types.js';
 import type {
   SessionPublicKeys,
@@ -235,6 +239,25 @@
     return await callServerEndpoint('get_session_public_keys', data);
   };
 
+const getOlmNotifsSessionInitializationDataActionTypes = Object.freeze({
+  started: 'GET_OLM_NOTIFS_SESSION_INITIALIZATION_DATA_STARTED',
+  success: 'GET_OLM_NOTIFS_SESSION_INITIALIZATION_DATA_SUCCESS',
+  failed: 'GET_OLM_NOTIFS_SESSION_INITIALIZATION_DATA_FAILED',
+});
+
+const getOlmNotifsSessionInitializationData =
+  (
+    callServerEndpoint: CallServerEndpoint,
+  ): ((
+    data: GetOlmNotifsSessionInitializationDataRequest,
+  ) => Promise<GetOlmNotifsSessionInitializationDataResponse>) =>
+  async data => {
+    return await callServerEndpoint(
+      'get_olm_notifs_session_initialization_data',
+      data,
+    );
+  };
+
 const policyAcknowledgmentActionTypes = Object.freeze({
   started: 'POLICY_ACKNOWLEDGMENT_STARTED',
   success: 'POLICY_ACKNOWLEDGMENT_SUCCESS',
@@ -267,6 +290,8 @@
   deleteAccount,
   deleteAccountActionTypes,
   getSessionPublicKeys,
+  getOlmNotifsSessionInitializationDataActionTypes,
+  getOlmNotifsSessionInitializationData,
   mergeUserInfos,
   logIn,
   logInActionTypes,
diff --git a/lib/types/endpoints.js b/lib/types/endpoints.js
--- a/lib/types/endpoints.js
+++ b/lib/types/endpoints.js
@@ -87,6 +87,8 @@
   SIWE_NONCE: 'siwe_nonce',
   SIWE_AUTH: 'siwe_auth',
   UPDATE_USER_AVATAR: 'update_user_avatar',
+  GET_OLM_NOTIFS_SESSION_INITIALIZATION_DATA:
+    'get_olm_notifs_session_initialization_data',
 });
 type SocketPreferredEndpoint = $Values<typeof socketPreferredEndpoints>;
 
diff --git a/lib/types/redux-types.js b/lib/types/redux-types.js
--- a/lib/types/redux-types.js
+++ b/lib/types/redux-types.js
@@ -66,7 +66,10 @@
   QueueReportsPayload,
   ReportStore,
 } from './report-types.js';
-import type { ProcessServerRequestsPayload } from './request-types.js';
+import type {
+  ProcessServerRequestsPayload,
+  GetOlmNotifsSessionInitializationDataResponse,
+} from './request-types.js';
 import type { UserSearchResult } from './search-types.js';
 import type { SetSessionPayload } from './session-types.js';
 import type {
@@ -988,6 +991,22 @@
       +error: true,
       +payload: Error,
       +loadingInfo: LoadingInfo,
+    }
+  | {
+      +type: 'GET_OLM_NOTIFS_SESSION_INITIALIZATION_DATA_STARTED',
+      +loadingInfo?: LoadingInfo,
+      +payload?: void,
+    }
+  | {
+      +type: 'GET_OLM_NOTIFS_SESSION_INITIALIZATION_DATA_SUCCESS',
+      +payload: GetOlmNotifsSessionInitializationDataResponse,
+      +loadingInfo: LoadingInfo,
+    }
+  | {
+      +type: 'GET_OLM_NOTIFS_SESSION_INITIALIZATION_DATA_FAILED',
+      +error: true,
+      +payload: Error,
+      +loadingInfo: LoadingInfo,
     };
 
 export type ActionPayload = ?(Object | Array<*> | $ReadOnlyArray<*> | string);
diff --git a/lib/types/request-types.js b/lib/types/request-types.js
--- a/lib/types/request-types.js
+++ b/lib/types/request-types.js
@@ -197,3 +197,13 @@
 export type GetSessionPublicKeysArgs = {
   +session: string,
 };
+
+export type GetOlmNotifsSessionInitializationDataRequest = {
+  +oneTimeKeysCount: number,
+};
+
+export type GetOlmNotifsSessionInitializationDataResponse = {
+  +signedIdentityKeysBlob: SignedIdentityKeysBlob,
+  +prekey: string,
+  +oneTimeKeys: string,
+};