diff --git a/src/app/features/call/CameraPreview.tsx b/src/app/features/call/CameraPreview.tsx
index 9ca8da7a..9ef670de 100644
--- a/src/app/features/call/CameraPreview.tsx
+++ b/src/app/features/call/CameraPreview.tsx
@@ -125,7 +125,7 @@ export function CameraPreview() {
             gap="200"
             grow="Yes"
           >
-            <Icon src={status === 'idle' ? Icons.User : Icons.Warning} />
+            <Icon src={status === 'idle' ? Icons.EyeBlind : Icons.Warning} />
             <Text size="L400" align="Center">
               {STATUS_MESSAGE[status as Exclude<CameraStatus, 'ready'>]}
             </Text>
diff --git a/src/app/hooks/useSingleSessionTab.ts b/src/app/hooks/useSingleSessionTab.ts
index ab8da517..ad794712 100644
--- a/src/app/hooks/useSingleSessionTab.ts
+++ b/src/app/hooks/useSingleSessionTab.ts
@@ -1,11 +1,12 @@
 import { useEffect, useMemo } from 'react';
 import { useNavigate } from 'react-router-dom';
 import { getRootPath } from '../pages/pathUtils';
+import { randomStr } from '../utils/common';
 
 export const useSingleSessionTab = (userId?: string) => {
   const broadcast = useMemo(() => new BroadcastChannel('in.cinny.broadcast'), []);
 
-  const tabId = useMemo(() => crypto.randomUUID(), []);
+  const tabId = useMemo(() => randomStr(), []);
   const navigate = useNavigate();
 
   useEffect(() => {
diff --git a/src/app/plugins/call/CallControl.ts b/src/app/plugins/call/CallControl.ts
index 211280f4..3c073af7 100644
--- a/src/app/plugins/call/CallControl.ts
+++ b/src/app/plugins/call/CallControl.ts
@@ -3,13 +3,14 @@ import { ObservableValue } from 'neurone/lib/utils/observable';
 import { Disposable } from 'neurone/lib/utils/disposable';
 import { CallControlState } from './CallControlState';
 import { ElementMediaStateDetail, ElementMediaStatePayload, ElementWidgetActions } from './types';
+import { randomStr } from '../../utils/common';
 
 export enum CallControlEvent {
   StateUpdate = 'state_update',
 }
 
 export class CallControl implements CallControlState, Disposable {
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   public readonly state: ObservableValue<CallControlState>;
 
diff --git a/src/client/MegolmBackup.ts b/src/client/MegolmBackup.ts
index 5d19c8ba..990d1e57 100644
--- a/src/client/MegolmBackup.ts
+++ b/src/client/MegolmBackup.ts
@@ -7,6 +7,7 @@ import { Base64 } from 'neurone/lib/utils';
 import { Disposable, Disposer } from 'neurone/lib/utils/disposable';
 import { ObservableValue } from 'neurone/lib/utils/observable';
 import { ProgressCallback, responseProgress } from './responseProgress';
+import { randomStr } from '../app/utils/common';
 
 export type ImportBackupIdle = {
   type: 'idle';
@@ -43,7 +44,7 @@ export type BackupRestoreState =
 export class MegolmBackup implements Disposable {
   private readonly disposer = new Disposer();
 
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   public readonly keyBackup: ObservableValue<KeyBackup | undefined>;
 
diff --git a/src/client/call/CallSession.ts b/src/client/call/CallSession.ts
index 689f8677..39a20d6d 100644
--- a/src/client/call/CallSession.ts
+++ b/src/client/call/CallSession.ts
@@ -10,6 +10,7 @@ import {
   getJoinRoomMemberId,
 } from '../storage/collections';
 import { CALL_APPLICATION_TYPE, DEFAULT_CALL_SLOT_IDS, resolveActiveRtcMembers } from './rtcMember';
+import { randomStr } from '../../app/utils/common';
 
 export type CallMember = {
   kind: 'call.member' | 'rtc.member';
@@ -71,7 +72,7 @@ export class CallSession implements Disposable {
 
   private readonly storage: Storage;
 
-  private readonly publisherKey = crypto.randomUUID();
+  private readonly publisherKey = randomStr();
 
   private callEvents: JoinRoomStateObject[] = [];
 
diff --git a/src/client/context.ts b/src/client/context.ts
index 4dde5291..68065c69 100644
--- a/src/client/context.ts
+++ b/src/client/context.ts
@@ -32,6 +32,7 @@ import { AccountDataType } from '../types/matrix/accountData';
 import { DecryptionManager } from './decryption';
 import { MegolmBackup } from './MegolmBackup';
 import { CallSessions } from './call';
+import { randomStr } from '../app/utils/common';
 
 export type StateContext = {
   join: {
@@ -929,7 +930,7 @@ export const createPendingMemberRoomObservable = async (
 };
 
 export const createVerificationRequestObservable = () => {
-  const publishKey = crypto.randomUUID();
+  const publishKey = randomStr();
   const verificationRequest = new Observable<InboundVerification | OutboundVerification>(
     publishKey
   );
@@ -944,7 +945,7 @@ export const createVerificationRequestObservable = () => {
 };
 
 export const createToDeviceEventsObservable = () => {
-  const publishKey = crypto.randomUUID();
+  const publishKey = randomStr();
   const toDeviceEvents = new Observable<ProcessedToDeviceEvent[]>(publishKey);
 
   const onToDeviceEvents = (events: ProcessedToDeviceEvent[]) => {
@@ -1036,7 +1037,7 @@ export const createBackupInfoObservable = async (
   secrets: Secrets,
   disposer: Disposer
 ): Promise<ObservableValue<BackupVersionInfo | undefined>> => {
-  const publishKey = crypto.randomUUID();
+  const publishKey = randomStr();
   const backupInfo = new ObservableValue<BackupVersionInfo | undefined>(undefined, publishKey);
 
   const update = async () => {
diff --git a/src/client/decryption/EncryptedEvent.ts b/src/client/decryption/EncryptedEvent.ts
index a48b6d41..42d6f160 100644
--- a/src/client/decryption/EncryptedEvent.ts
+++ b/src/client/decryption/EncryptedEvent.ts
@@ -5,6 +5,7 @@ import {
 } from 'neurone/lib/api/types';
 import { MegolmDecryptionError, RoomEncryption } from 'neurone/lib/crypto/machine';
 import { ObservableValue } from 'neurone/lib/utils/observable';
+import { randomStr } from '../../app/utils/common';
 
 export class EventDecryptionIdle {}
 
@@ -36,7 +37,7 @@ export class EventDecryptionSuccess<T extends ClientEventWithoutRoomId> {
 export class EncryptedEvent<T extends ClientEventWithoutRoomId> {
   private readonly roomEncryption: RoomEncryption;
 
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   private decryptPromise: Promise<void> | undefined;
 
diff --git a/src/client/room/ThreadTimeline.ts b/src/client/room/ThreadTimeline.ts
index 3cd05844..f92f5063 100644
--- a/src/client/room/ThreadTimeline.ts
+++ b/src/client/room/ThreadTimeline.ts
@@ -23,6 +23,7 @@ import { rRelations, rThread, rUnsigned } from '../reader';
 import { TimelineUtils } from './TimelineUtils';
 import { LocalEventOutbox } from './local-event/LocalEventOutbox';
 import { EventSenderIdle, LocalEvent, LocalEventSender, LocalMessage } from './local-event';
+import { randomStr } from '../../app/utils/common';
 
 export type ThreadSyncData = {
   events: MessageEventWithoutRoomId[];
@@ -31,7 +32,7 @@ export type ThreadSyncData = {
 };
 
 export class ThreadTimeline implements TimelineView, Disposable {
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   public readonly roomId: string;
 
diff --git a/src/client/room/Timeline.ts b/src/client/room/Timeline.ts
index f3f63468..ce3f9d1c 100644
--- a/src/client/room/Timeline.ts
+++ b/src/client/room/Timeline.ts
@@ -25,9 +25,10 @@ import { getThreadId } from '../../app/utils/room';
 import { TimelineUtils } from './TimelineUtils';
 import { EventSenderIdle, LocalEvent, LocalEventSender, LocalMessage } from './local-event';
 import { LocalEventOutbox } from './local-event/LocalEventOutbox';
+import { randomStr } from '../../app/utils/common';
 
 export class Timeline implements TimelineView, Disposable {
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   public readonly roomId: string;
 
diff --git a/src/client/room/TimelineBatchManager.ts b/src/client/room/TimelineBatchManager.ts
index 61a72a82..f4bb84e5 100644
--- a/src/client/room/TimelineBatchManager.ts
+++ b/src/client/room/TimelineBatchManager.ts
@@ -1,6 +1,7 @@
 import { MessageEventWithoutRoomId } from 'neurone/lib/api/types';
 import { ObservableValue } from 'neurone/lib/utils/observable';
 import { MessageBatch, Messages, BatchInfo, BatchChange } from './messages';
+import { randomStr } from '../../app/utils/common';
 
 export class TimelineBatchManager {
   private readonly publishKey: string;
@@ -30,7 +31,7 @@ export class TimelineBatchManager {
       this.batch.publish(
         this.publishKey,
         new MessageBatch(
-          crypto.randomUUID(),
+          randomStr(),
           this.batch.read.messages,
           this.batch.read.prev,
           new BatchInfo(undefined, false),
@@ -117,7 +118,7 @@ export class TimelineBatchManager {
 
   public loadEvents(events: MessageEventWithoutRoomId[], prevToken?: string, nextToken?: string) {
     const newBatch = new MessageBatch(
-      crypto.randomUUID(),
+      randomStr(),
       new Messages(events),
       new BatchInfo(prevToken, !prevToken),
       new BatchInfo(nextToken, !nextToken),
diff --git a/src/client/room/index.ts b/src/client/room/index.ts
index 012879e4..52857ff7 100644
--- a/src/client/room/index.ts
+++ b/src/client/room/index.ts
@@ -4,6 +4,7 @@ import { JoinRoom } from 'neurone/lib/api/matrix/client/v3/sync';
 import { MatrixRequest } from 'neurone/lib/matrix-request';
 import { Timeline } from './Timeline';
 import { SyncValue } from '../sync';
+import { randomStr } from '../../app/utils/common';
 
 export * from './Timeline';
 export * from './TimelineView';
@@ -14,7 +15,7 @@ export const createTimelines = (
   request: MatrixRequest,
   disposer: Disposer
 ): ObservableValue<Map<string, Timeline>> => {
-  const publishKey: string = crypto.randomUUID();
+  const publishKey: string = randomStr();
 
   const roomToTimeline = new ObservableValue<Map<string, Timeline>>(new Map(), publishKey);
 
diff --git a/src/client/room/local-event/LocalEventOutbox.ts b/src/client/room/local-event/LocalEventOutbox.ts
index 0e2c67ca..23b532b5 100644
--- a/src/client/room/local-event/LocalEventOutbox.ts
+++ b/src/client/room/local-event/LocalEventOutbox.ts
@@ -1,8 +1,9 @@
 import { ObservableValue } from 'neurone/lib/utils/observable';
 import { EventSenderSuccess, LocalEventSender } from './LocalEventSender';
+import { randomStr } from '../../../app/utils/common';
 
 export class LocalEventOutbox {
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   public readonly senders: ObservableValue<readonly LocalEventSender[]>;
 
diff --git a/src/client/room/local-event/LocalEventSender.ts b/src/client/room/local-event/LocalEventSender.ts
index 7126823c..ef1a6d37 100644
--- a/src/client/room/local-event/LocalEventSender.ts
+++ b/src/client/room/local-event/LocalEventSender.ts
@@ -3,6 +3,7 @@ import { MatrixError, MatrixRequest, parseMatrixResp } from 'neurone/lib/matrix-
 import { ObservableValue } from 'neurone/lib/utils/observable';
 import to from 'await-to-js';
 import { LocalEvent } from './LocalEvent';
+import { randomStr } from '../../../app/utils/common';
 
 export class EventSenderIdle {
   constructor(public readonly send: () => Promise<void>) {}
@@ -35,7 +36,7 @@ export class LocalEventSender<TContent extends object = object> {
 
   private readonly request: MatrixRequest;
 
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   public readonly state: ObservableValue<LocalEventSenderState>;
 
diff --git a/src/client/room/messages/MessageBatch.ts b/src/client/room/messages/MessageBatch.ts
index a9d5d8b1..49e71150 100644
--- a/src/client/room/messages/MessageBatch.ts
+++ b/src/client/room/messages/MessageBatch.ts
@@ -1,6 +1,7 @@
 import { BatchChange } from './BatchChange';
 import { BatchInfo } from './BatchInfo';
 import { Messages } from '.';
+import { randomStr } from '../../../app/utils/common';
 
 export class MessageBatch {
   public readonly id: string;
@@ -15,7 +16,7 @@ export class MessageBatch {
 
   static emptyAtForwardEnd(): MessageBatch {
     return new MessageBatch(
-      crypto.randomUUID(),
+      randomStr(),
       new Messages([]),
       new BatchInfo(),
       new BatchInfo(undefined, true),
diff --git a/src/client/room/messages/MessageRange.ts b/src/client/room/messages/MessageRange.ts
index 41e9b0f4..b7808544 100644
--- a/src/client/room/messages/MessageRange.ts
+++ b/src/client/room/messages/MessageRange.ts
@@ -1,6 +1,7 @@
 import { Disposable, Disposer } from 'neurone/lib/utils/disposable';
 import { ObservableValue } from 'neurone/lib/utils/observable';
 import { MessageBatch } from './MessageBatch';
+import { randomStr } from '../../../app/utils/common';
 
 export type RangeInfo = {
   start: number;
@@ -12,7 +13,7 @@ export class MessageRange implements Disposable {
 
   public readonly info: ObservableValue<RangeInfo>;
 
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   private oldLength: number;
 
diff --git a/src/client/room/relations/Relations.ts b/src/client/room/relations/Relations.ts
index c59029b8..20fb707e 100644
--- a/src/client/room/relations/Relations.ts
+++ b/src/client/room/relations/Relations.ts
@@ -3,6 +3,7 @@ import { Disposable, Disposer } from 'neurone/lib/utils/disposable';
 import { ObservableValue } from 'neurone/lib/utils/observable';
 import { Relation, RelationType } from '../../../types/matrix/common';
 import { rContent, rRelatesTo } from '../../reader';
+import { randomStr } from '../../../app/utils/common';
 
 export class Relations<T extends RelationType, Content extends Relation<T> = Relation<T>>
   implements Disposable
@@ -13,7 +14,7 @@ export class Relations<T extends RelationType, Content extends Relation<T> = Rel
     Map<string, MessageEventWithoutRoomId<Content>[]>
   >;
 
-  private publishKey: string = crypto.randomUUID();
+  private publishKey: string = randomStr();
 
   private disposer = new Disposer();
 
diff --git a/src/client/room/relations/RelationsProcessor.ts b/src/client/room/relations/RelationsProcessor.ts
index 7eeb4478..b9d48f91 100644
--- a/src/client/room/relations/RelationsProcessor.ts
+++ b/src/client/room/relations/RelationsProcessor.ts
@@ -5,9 +5,10 @@ import { MessageEvent } from '../../../types/matrix/room';
 import { Relations } from './Relations';
 import { RelationType, ReactionContent } from '../../../types/matrix/common';
 import { getRedactedEventId, redacted, reference, relation, replaced, replacement } from './utils';
+import { randomStr } from '../../../app/utils/common';
 
 export class RelationsProcessor implements Disposable {
-  private readonly publishKey = crypto.randomUUID();
+  private readonly publishKey = randomStr();
 
   public readonly reactions: Relations<RelationType.Annotation, ReactionContent>;
 
diff --git a/src/client/storage/utils.ts b/src/client/storage/utils.ts
index 77a96abe..a19e1252 100644
--- a/src/client/storage/utils.ts
+++ b/src/client/storage/utils.ts
@@ -1,2 +1,2 @@
-export const encodeKey = (...args: string[]): string => args.join('');
+export const encodeKey = (...args: string[]): string => args.join('+');
 export const MAX_UNICODE = '\u{10FFFF}';