Bypass pin(4 digit passcode on your android app)

i have found that this activities are exported ** Package: sh.whisper ** sh.whisper.WMainActivity sh.whisper.WWhisperBrowserActivity sh.whisper.WRelatedActivity sh.whisper.WDiscoverActivity sh.whisper.WCategoryFeedActivity sh.whisper.WSettingsActivity Parent Activity: sh.whisper.WMainV4Activity sh.whisper.WShareActivity sh.whisper.WQuickCreateActivity Parent Activity: sh.whisper.WMainV4Activity sh.whisper.WUserActivity sh.whisper.WNotificationsActivity sh.whisper.WInboxActivity sh.whisper.WParseDeepLinkActivity sh.whisper.WAddGroupActivity whisper android app have a 4 digits PIN that can be set by the user to protect from unauthorized access if the phone is lost(protection for user's inbox and notification) , but **sh.whisper.WNotificationsActivity** and **sh.whisper.WInboxActivity** are exported ,so any android app can called these activities to bypass the **4-digit code** watch this video on have i bypass the 4-digit code ** references** http://cwe.mitre.org/data/definitions/926.html